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Электронный компонент: CT2581

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FEATURES
eroflex Circuit T
echnology
Data Bus Modules For The Future SCDCT2578 REV B 3/12/98
CIRCUIT TECHNOLOGY
www.aeroflex.com/act1.htm
CIRCUIT TECHNOLOGY
www.aeroflex.com/act1.htm
FUNCTIONAL BLOCK DIAGRAM
s
Complete RT Protocol
s
Meets MIL-STD-1553 A/B & MIL-STD-1760
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Simple interface
s
Dual Transceivers (1553 / 1760 or McAir)
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+5V only Power Supply
s
Low Power (0.15 Watts per Channel)
s
Only validated messages transferred
s
Optional Data Wrap Around
s
Store Released Signal
s
Packaging Hermetic Ceramic
q
119 Lead, 1.28" SQ. x .16" PGA
q
84 Lead, 1.645" SQ. x .14" CQFP
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Any Message may be Illegalized
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McAir Reduced Response Time Option (inh MC1F)
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Optional 1760 checksum
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1760 Header word identification
s
Latched RT Address
s
MIL-PRF-38534 Compliant Circuits Available
STATUS REGISTER
RT PROTOCOL
STATUS REGISTER
COMMAND REGISTER
WATCHDOG TIMER
16 BIT TRANSMIT BUFFER
MANCHESTER DECODER
T
R
A
N
S
E
I
V
E
R
ENCODER / DECODER
1760 OPTIONS
STORE RELEASED
HEADER WORD IDENT
1760 CHECKSUM
GENERATION/VALIDATION
32 WORD
DATA MEMORY
WORD COUNTER
LAST COMMAND REG
BIT REGISTER
REMOTE TERMINAL
STATE SEQUENCER
MANCHESTER DECODER
16 BIT RECEIVE BUFFER
WATCHDOG TIMER
16 BIT TRANSMIT BUFFER
MANCHESTER DECODER
T
R
A
N
S
E
I
V
E
R
ENCODER / DECODER
MANCHESTER DECODER
16 BIT RECEIVE BUFFER
BUS 0
BUS 1
CMD / HRD / DATA
CT2578 / CT2581
SIMPLE REMOTE TERMINAL
FOR MIL-STD-1553 / 1760 & McAir
2
SCDCT2578 REV B 3/11/98
GENERAL DESCRIPTION
SIGNAL DESCRIPTIONS
CT2578 is for use in simple Remote Terminal applications
without the need for a processor or software development.
It provides the complete protocol for a Remote Terminal,
Signal is connected to the positive side of the external data bus
supporting all types of message transfers including all 15 mode
codes, with comprehensive error checking. Error handling of
data is not required by the subsystem. The user interface is a 16
bit bidirectional highway with a few control lines.
The low power transceivers are capable of providing the output
voltage required by MIL-STD-1760 and are powered by a +5V
supply.
If sinusoidal (McAir) transceivers are required then the part
number becomes CT2581. This is the only difference between
CT2578 and CT2581.
A 32 word data buffer memory is used to store messages until
validation is complete. Only validated messages are transferred
to the subsystem at a rate of 500 nS per word. Data to be
transmitted is transferred from the subsystem to this buffer
memory at a maximum rate of 1 uS per word. This data memory
may be bypassed in the receive mode and data transferred to the
subsystem on a word by word basis as it is being received.
The device has an optional RT wrap around capability. When
WRAPEN is active, data received at subaddress 1E (30) remains
stored in the data buffer memory (i.e. not transferred to the
subsystem). If followed by a transmit from subaddress 1E the
same data will be transmitted.
There is an option within the device to reduce the response time
in order to conform to other standards such as 1553A and
McAir. In this mode subaddress 1F is allocated a normal
subaddress with subaddress 00 reserved for mode commands.
Any message may be illegalized by applying an active low on the
NME discrete status input. The Remote Terminal will respond
with the Message Error bit set in the status and not use the
information received.
A hardware implementation of the 1760 checksum algorithm
within the device may be enabled via signal NENCHK. When
transmitting, the checksum word is inserted in the last word
position, and when receiving, a valid checksum word will
generate the open drain output (STATUS). The STATUS
output may be hard wired to any of the discrete status inputs (e.g.
Service Request), if it is also hard wired to the input NILLCMD
the device will respond to a failed checksum with the selected
status bit set and not use the data (i.e. not transfer the data to the
subsystem).
In addition to the signal NVCR (valid command word received)
which may be used to illegalize commands, a signal NHDR
(header word received) is available to the subsystem for
verification of the 1760 message header.
The RT address lines are latched on RESET as required by
1760. If all six RT address lines go open circuit the store
released signal (STREL) will go high.
The device is packaged in a 119 pin grid array or 84 lead CQFP
package.
1553 / 1760 DATA BUS
DATABUS 0
transformers for bus 0.
NDATABUS 0
Signal is connected to the negative side of the external data bus
transformers for bus 0.
DATABUS 1
Signal is connected to the positive side of the external data bus
transformers for bus 1.
NDATABUS 1
Signal is connected to the negative side of the external data bus
transformers for bus 1.

HARD WIRED
ADDR A-E (Inputs with pull up resistor)
Remote Terminal address inputs for the unit. ADDR A is the
least significant bit and ADDR E is the most significant bit.
These inputs are internally latched every time the unit is reset.
The latched address information is then compared to the
incoming command word.
ADDR P (Input with pull up resistor)
Parity bit for the Remote Terminal address inputs. ADDR P
must be set to ODD parity. This input is latched as above.
WRAPEN (Input with pull down resistor)
Select Remote Terminal wrap around to subaddress 1E. The
Bus Controller sends data to subaddress 1E which remains in the
data buffer memory and is available to be sent back on the very
next command by the Bus Controller. The data in the data buffer
memory in this mode does not get transferred to the subsystem.
If the very next command is not a transmit command to
subaddress 1E, the data buffer memory is flushed and will
respond normally to the next set of commands. If the wrap
around test is enabled, data to subaddress 1E must be transferred
in the correct sequence.
"0" = Normal mode
"1" = Wrap Around mode
MCAIR (Input with pull down resistor)
This signal sets the unit to respond with a status word within
4 uS (dead bus time). Subaddress 1F is also enabled to be a valid
subaddress for data. Normally subaddress 00 and 1F are
reserved for mode codes.
"1" = 4 uS dead bus response time, subaddress 1F used for data.
"0" = 12 uS response time, subaddress 1F used for mode codes.
C16MH
Z
(Input with pull up resistor)
Free running 16 MH
Z
clock input.
SUBSYSTEM INTERFACE
T0-T15 (Bibirectional IO)
16 bit bidirectional highway to transfer all information to / from
subsystem. The user can also utilise this bus to monitor
Command word and Header word (1760 requirement) for
message illegalization.
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SCDCT2578 REV B 3/11/98
NRES (Bibirectional IO with pull up resistor)
DISCRETE RT STATUS INPUTS
Bidirectional reset pin. Interface to this pin should be in the form
of an open collector pull down driver. The unit will be reset
when a low level input is asserted on power up. The pin is
bidirectional in that the unit will drive the signal out low after the
status response of the mode code Reset Remote Terminal. Upon
reset the unit will be able to respond immediately after the rising
edge of NRES.
NILLCMD (Input with pull up resistor)
Input to illegalize a command to the Remote Terminal with a
clear status response. The signal is sampled after NVCR except
non mode code receive commands in which case it is sampled
after the last data word has been received. A low on this input
will illegalize the message, no transfers to / from the subsystem
will take place. The device will respond with a clear status
unless a bit has been specifically set. No data will be transmitted
following status.
NVCR (Output)
Early indication that the Remote Terminal has received a
command and the command word is available on T0-T15. This
can be used for message illegalization.
NDATA (Output)
Access to valid data word in real time. Data word available on
T0-T15 during active low signal.
NCMDSTRB (Output)
This signal indicates that a completely validated message has
been received for standard subaddress data activity. Mode
commands with or without data will not generate this signal.
The NCMDSTRB signal is 8.5 uS long and is an indication that
a DMA burst will initiate at the end of NCMDSTRB to transfer
words between the 32 word data memory and the subsystem.
The Command word is available on T0-T15 during this period.
NDATAST (Output)
Signal to transfer normal validated received data from the data
buffer memory to the subsystem at a rate of 500 nS per word via
the T0-T15 highway.
NSSTRB (Input with pull up resistor)
Signal to transfer normal data for transmission from the
subsystem to the data buffer memory at a maximum rate of 1 uS
per word via the T0-T15 highway.
C1MHZ (Output)
Free running 1 MHZ clock to subsystem. NSSTRB must be
synchronised to this clock.
NENVW (Output)
Signal to transfer Vector word from subsystem to unit in
response to `Transmit Vector Word' mode command via the
T0-T15 highway.
NSYNC (Output)
Signal to subsystem indicating receipt of a synchronise mode
commands If the mode code has an associated data word, it will
be available on T0-T15 at this time. If there is no associated data
word, T0-T15 will be zero.
The following signals are inputs to set the appropriate bits in the
Remote Terminals status word. All inputs are sampled after
NVCR except non mode code receive commands in which case
they are sampled after the last data word has been received. All
status inputs are active low.
NME (Input with pull up resistor)
Message Error, illegalizes message. No transfers to / from the
subsystem will take place. No data will be transmitted following
the status.
NBUSY (Input with pull up resistor)
Subsystem Busy. No data will be transferred to / from the
subsystem and no data will be transmitted following status for
non mode code transfers.
NTF (Input with pull up resistor)
Terminal Flag.
NSR (Input with pull up resistor)
Service Request.
NSSFLAG (Input with pull up resistor)
Subsystem Flag.
1760 SIGNALS
NENCHK (Input with pull up resistor)
Enables / disables the internal hardware checksum generation
and validation. When enabled, the circuitry will check all
incoming data for correct checksum and generate the correct
checksum word for an outgoing data transfer.
"0" = Enable checksum circuitry.
"1" = Disable checksum circuitry.
STATUS (Open drain output)
Open drain output will toggle high or low on each incoming data
word from the 1553 data bus provided NENCHK is enabled.
When the last data word is received the STATUS line is sampled
by the protocol circuitry to determine if the checksum for the
message is valid. At the end of the message, if STATUS is low
then the checksum is not valid. This STATUS signal can be
wired to several different pins to customise the units response to
a checksum failure. STATUS can be wired to signals such as
NILLCMD and NSR which would cause the message to be
illegalized and set Service Request bit in the Status.
NHDR (Output)
In Mil-Std-1760, the first data word of a message is defined as
a Header word. The NHDR signal indicates the presence of the
Header word on the T0-T15 highway as it is received. The
Header is also stored in the data buffer memory along with the
complete message.
STREL (Output)
When the store is released from the aircraft all the Remote
Terminal address inputs go high causing signal STREL to go
high.
DATA BUS
DATA
COMMAND
DATA
DATA
STATUS
NVCR
NHDR
NDATA
T0-T15
1
2
3
4
5
6
7
NCMDSTRB
NDATAST
DATA BUS
DATA
DATA
DATA
COMMAND
STATUS
NVCR
T0-T15
1
2
3
4
NCMDSTRB
NSSTRB
DATA BUS
TRAN CMD
REC CMD
DATA
DATA
STATUS
NVCR
NHDR
NDATA
T0-T15
1
2
3
8
5
6
7
4
NCMDSTRB
STATUS
NDATAST
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SCDCT2578 REV B 3/11/98
MESSAGE FORMATS
BC TO RT TRANSFER
1. Valid command word received, contents available on T0-T15 for illegalization purposes.
2. First valid data word (1760 header word) received, contents available on T0-T15 and stored in 32 word data memory.
3. Second valid data word received, contents available on T0-T15 and stored in 32 word data memory.
4. Last valid data word received, contents available on T0-T15 and stored in 32 word data memory. Status bits must be valid within 250nS.
5. Status register contents transferred to transmit buffer.
6. NCMDSTRB indicates valid message received, command word available on T0-T15.
7. Data words transferred from 32 word data memory to subsystem at 500 nS per word.
RT TO BC TRANSFER
1. Valid command word received, contents available on T0-T15 for illegalization purposes. Status must be valid within 600 nS.
2. Status register contents transferred to transmit buffer.
3. NCMDSTRB indicates valid message received, command word available on T0-T15.
4. Data words transferred from subsystem to 32 word data memory at 1 uS per word.
RT TO RT TRANSFER (RECEIVING TERMINAL)
DATA BUS
COMMAND
STATUS
NVCR
T0-T15
1
3
NRES/NSYNC
When applicable
2
DATA BUS
COMMAND
STATUS
NVCR
T0-T15
1
2
4
3
DATA
NDATA
NSYNC
When applicable
DATA BUS
COMMAND
STATUS
NVCR
T0-T15
1 2
DATA
3
NENVW
When applicable
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SCDCT2578 REV B 3/11/98
1. Valid receive command word received, contents available on T0-T15 for illegalization purposes.
2. Valid transmit command word received, contents available on T0-T15.
3. Status response of transmitting terminal received.
4. First valid data word (1760 header word) received, contents available on T0-T15 and stored in 32 word data memory.
5. Last valid data word received, contents available on T0-T15 and stored in 32 word data memory. Status bits must be valid within 250nS.
6. Status register contents transferred to transmit buffer.
7. NCMDSTRB indicates valid message received, command word available on T0-T15.
8. Data words transferred from 32 word data memory to subsystem at 500 nS per word.
MODE CODES WITHOUT DATA
1. Valid command word received, contents available on T0-T15 for illegalization purposes. Status must be valid within 600 nS.
2. Status register contents transferred to transmit buffer.
3. Synchronise mode command, T0-T15 = 0.
MODE CODES WITH DATA RECEIVE
1. Valid command word received, contents available on T0-T15 for illegalization purposes. Status must be valid within 600 nS.
2. Valid data word received, contents available on T0-T15. Synchronise data word stored in 32 word data memory.
3. Status register contents transferred to transmit buffer after message validation.
4. Synchronise data word(when applicable) transferred from 32 word data memory to main memory and available on T0-T15.
MODE CODES WITH DATA TRANSMIT
1. Valid command word received, contents available on T0-T15 for illegalization purposes. Status must be valid within 600 nS.
2. Status register contents transferred to transmit buffer after message validation.
3. Vector word (when applicable) transferred from subsystem to transmit buffer.
DATA BUS
DATA
COMMAND
DATA
DATA
NVCR
NHDR
NDATA
T0-T15
1
2
3
4
5
6
NCMDSTRB
NDATAST
DATA BUS
TRAN CMD
REC CMD
DATA
DATA
STATUS
NVCR
NHDR
NDATA
NDATAST
1
2
3
7
5
6
4
NCMDSTRB
T0-T15
DATA BUS
COMMAND
NVCR
T0-T15
1
NRES/NSYNC
When applicable
2
6
SCDCT2578 REV B 3/11/98
BC TO RT TRANSFER BROADCAST
1. Valid command word received, contents available on T0-T15 for illegalization purposes.
2. First valid data word (1760 header word) received, contents available on T0-T15 and stored in 32 word data memory.
3. Second valid data word received, contents available on T0-T15 and stored in 32 word data memory.
4. Last valid data word received, contents available on T0-T15 and stored in 32 word data memory. Status bits must be valid within 250nS.
5. NCMDSTRB indicates valid message received, command word available on T0-T15.
6. Data words transferred from 32 word data memory to subsystem at 500 nS per word.
RT TO RT TRANSFER BROADCAST (RECEIVING TERMINAL)
1. Valid receive command word received, contents available on T0-T15 for illegalization purposes.
2. Valid transmit command word received, contents available on T0-T15.
3. Status response of transmitting terminal received.
4. First valid data word (1760 header word) received, contents available on T0-T15 and stored in 32 word data memory.
5. Last valid data word received, contents available on T0-T15 and stored in 32 word data memory. Status bits must be valid within 250nS.
6. NCMDSTRB indicates valid message received, command word available on T0-T15 and stored in the 32 word command memory.
7. Data words transferred from 32 word data memory to subsystem at 500 nS per word.
MODE CODES WITHOUT DATA BROADCAST
1. Valid command word received, contents available on T0-T15 for illegalization purposes. Status must be valid within 600 nS.
2. Synchronise mode command, T0-T15 = 0.
DATA BUS
COMMAND
NVCR
T0-T15
1
2
3
DATA
NDATA
NSYNC
When applicable
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SCDCT2578 REV B 3/11/98
MODE CODES WITH DATA RECEIVE BROADCAST
1. Valid command word received, contents available on T0-T15 for illegalization purposes. Status must be valid within 600 nS.
2. Valid data word received, contents available on T0-T15. Synchronise data word stored in 32 word data memory.
3. Synchronise data word (when applicable) transferred from 32 word data memory to main memory and available on T0-T15.
REMOTE TERMINAL DETAIL
COMMAND REGISTER
The five most significant bits of the command register contain the
Remote Terminal Address.
Bit 10 of the register is the Transmit / Receive bit. If it is set to '1'
the device will perform the transmit sequence and it is set to '0' it
will perform the receive sequence.
Bits 5 to 9 contain the Subsystem Address but two of these
addresses are reserved and one programable. 11111 (1F) or 00000
(00) indicate that the command is a mode code. The least
significant five bits of the command register are used to decode the
mode code and are not used as the word counter as a mode code
may only have a maximum of one associated word.
111110 (1E) and WRAPEN sets the sequencer up to perform the
wrap around function.

The least significant five bits of the command register contain the
number of data words to be transmitted or received. 11111 is 31
words and 00000 is 32 words.

STATUS REGISTER
ME
Message Error: set internally as a result of an error in the received
message or set externally with a discrete pin to illegalize a
message.
INST
Instrumentation: set to zero.
SR
Service Request: set with a discrete pin.
RESVD
Reserved: set to zero
BCST
Broadcast Command Received: set internally.
BUSY
Subsystem Busy: set with a discrete pin.
SSFL
Subsystem Flag: set with a discrete pin.
DBCA
Dynamic Bus Control Acceptance: set to zero.
TF
Terminal Flag: set with a discrete pin.
The status register is cleared and the external bits loaded on all
commands except 'Transmit Status' and 'Transmit Last Command'.
The external status bits (both discrete and programable) must be
valid 600 nS from the rising edge of NVCR for transmit commands
and mode codes, and 250 nS from the rising edge of NDATA for
the last data word in a receive message.
If discrete status inputs are not used they may be left open circuit.
STATUS RESPONSE TIME
The response time (all commands) measured from the mid bit zero
crossing of the last bit of the last word to the mid bit zero crossing
of the status word sync is nominally 11.0 uS.
This time period is used to monitor for more data words on the bus.
If a valid sync field followed by four valid Manchester bi-phase bits
are detected then this is considered to be another word on the bus.
The response time may be reduced to 6.0 uS (4.0 uS dead bus
time) by setting the MCAIR input active high.
MESSAGE ILLEGALIZATION
Any command or mode command may be illegalized by setting the
NME input active low. The remote terminal will respond with
status with the Message Error bit set, provided the message was
valid, and not use the information received. There will be no
transfers to or from the subsystem.
8
SCDCT2578 REV B 3/11/98
One way to implement this function is to place a latching PROM
The device will only consider a command word valid if the
to the T0-T10 data bus. The PROM would only have to decode 11
following conditions are met:-
bits (5 bits subaddress, 5 bit word count and 1 bit T/R) and have
a) It contains the correct sync field.
a one bit output to place a high / low level on the NME input pin.
b) Correct Manchester bi-phase (16 bits plus parity).
The upper five bits (T11-T15) are just the Remote Terminal
c) Correct parity (odd).
address for the unit which is constant so no decode of these bits is
d) Correct terminal address or broadcast address.
necessary. The latching signal for the PROM would be the NVCR
e) Does not follow contiguously a valid word on the same bus.
line. The NME signal will remain latched and stable until the next
rising edge of NVCR.
Reserved mode commands are automatically declared illegal by the
device and need not be included in the PROM decode.
All other conditions which require the message error bit to be set
c) Correct parity (odd).
are automatic.
d) Follows contiguously a valid word on the same bus.
1760 CHECKSUM
The 1760 checksum logic is enabled by setting the input NENCHK
active low.
For transmit messages the checksum word is generated and
inserted in the last word position of the transmitted message.
For received messages the last data word receive (the checksum
word) is validated. If this word meets the required criteria the
output STATUS remains low. This signal will toggle up and down
for each data word received as it is calculating the checksum.
The open drain output (STATUS) signal may be hard wired to any
of the discrete status inputs to set the required bit of the status
response in the current message. In addition it may be hard wired
to the input NILLCMD which will prevent the message being
written to memory (e.g. if it is required to set the Service Request
bit and not use the data for a failed checksum - hard wire STATUS
to NSR and NILLCMD).
1760 HEADER WORD
In 1760 applications the first data word received is designated the
header word. An output NHDR is provided to indicate the
presence of this word on the highway T0-T15 for verification
purposes. A failed header word may be treated in the same way as
a failed checksum.
STORE RELEASED
The signal STREL is provided in 1760 applications to indicate to
the subsystem that the store is no longer connected to the aircraft.
INITIALISATION OF THE DEVICE
The device must be reset to a known state on power up. (The RT
address will be latched on power up). It will remain inactive until
a valid command word is received. If the device is in the process
of sequencing a command and a new command is received on the
alternative bus, the sequence will be terminated and the device will
sequence the new command.
The device will only consider a data word valid if the following
conditions are met:-
a) It contains the correct sync field.
b) Correct Manchester bi-phase (16 bits plus parity).
Upon receipt of a valid command word the signal NVCR becomes
active low for 500 nS. (The command word is available on T0-T15
during this period for message illegalization).
On all commands except 'Wrap Around Transmit' the 32 data word
memory is cleared.
RT TO BC TRANSFER
If a valid command is received to transmit up to 32 data words the
device will initially respond with Status.
The signal NCMDSTRB goes low for 8.5 uS synchronized to the
1 MHZ clock indicating that a completely validated message has
been received. The transmit Command word appears on T0-T15
at this time.
If the Busy bit of the Status is set the sequence will terminate after
NCMDSTRB.
The end of the NCMDSTRB will initiate the DMA cycle to transfer
the data words from the subsystem to the data buffer memory in a
single burst.
The subsystem enables the first data word onto T0-T15 and applies
a NSSTRB to the device synchronized to the 1 MHZ clock, this
data is stored in the data buffer memory. The subsystem must
continue transferring the correct amount of words to the device in
this manner at a rate of between 62.5 kHz and 1 MHZ.
Data is transferred from the data buffer memory to the output buffer
for transmission as required by the 1553 data bus.
If the 1760 checksum is enabled, the checksum word will be
automatically generated and transmitted as the last data word. For
example, if a Command is received to transmit five data words the
subsystem can load four or five data words. If the subsystem loads
four data words the device will generate the last data word for
transmission. If the subsystem loads five data words the device will
ignore the last data word and transmit the internally generated
checksum word instead.
RX
CMD
DATA DATA
DATA
*
STATUS
RX
CMD
DATA
*
STATUS
STATUS
TX
CMD
*
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SCDCT2578 REV B 3/11/98
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. Broadcast address.
No status response.
Set message error.
Set broadcast.
Sequence terminated.
4. Too few NSSTRB from
Message truncated.
subsystem.
5.Too many NSSTRB from
Bit 1 of BIT register set.
subsystem.
Too many data words will
not be transmitted.
Note: Sequence terminated - termination will take place before
signal NCMDSTRB becomes active, therefore no transfers to /
from subsystem will occur.
BC TO RT TRANSFER
If a valid command is received to receive up to 32 data words and
the second word is another command word then an RT to RT
transfer has been set up (see RT to RT transfer).
All valid data words received are stored in the data buffer memory
until message validation is complete after which the device will
respond with Status.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Data words are also available on T0-T15 as they are received
indicated by signal NDATA.
Only after the message has been completely validated will the data
be transferred to the subsystem in a single burst at 500 nS per
word. This ensures that only complete validated messages are
transferred to the subsystem.
When a complete validated message is stored in the data buffer
memory the signal NCMDSTRB goes low for 8.5 uS synchronized
to the 1 MHZ clock indicating that a completely validated message
has been received. The receive Command word appears on T0-T15
at this time.
If the Busy bit of the Status is set the sequence will terminate after
NCMDSTRB.
The end of the NCMDSTRB will initiate the DMA cycle to transfer
the data words from the data buffer memory to the subsystem. The
first word received is enabled onto T0-T15 and the signal
NDATAST is pulsed low. This sequence is repeated for each data
word that was received.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Invalid data word.
No status response.
Set message error.
Sequence terminated.
3. Non contiguous data.
No status response.
Set message error.
Sequence terminated.
4. Too few data words.
No status response.
Set message error.
Sequence terminated.
5. Too many data words.
No status response.
Set message error.
Set broadcast.
Sequence terminated.
Note: Sequence terminated - termination will take place before
signal NCMDSTRB becomes active, therefore no transfers to /
from subsystem will occur.
RT TO RT TRANSFER
To initiate an RT to RT transfer the Bus Controller will send a
receive command to RTA followed contiguously by a transmit
command to RTB.
RTB will respond with status and contiguous data (see RT to BC
transfer).
RTA (the receiving terminal) will receive the status and data
transmitted by RTB and store the received data in the data buffer
memory until the entire RT to RT transfer has been validated, after
which it will respond with its own status provided it was not a
broadcast command, in which case the status transmission will be
suppressed and the broadcast bit set. It will then transfer the data
to the subsystem (see BC to RT transfer).
The error detection for the transmitting terminal will be the same
as for RT to BC transfer. The error detection for the receiving
terminal is as follows:-
RX
CMD
DATA DATA
DATA
*
STATUS
TX
CMD
DATA DATA
DATA
*
STATUS
DBC
CMD
*
STATUS
10
SCDCT2578 REV B 3/11/98
Error Conditions
Action taken by device
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Non contiguous
No status response.
command words.
Set message error.
Sequence terminated.
3. Transmit command
No status response.
followed by another word
Set message error.
(excluding command
Sequence terminated.
word for RTA, in which
case it will respond to
the latest command).
4. Transmitting terminal
No status response.
does not respond with
Set message error.
status within 16 uS.
Sequence terminated.
5. Incorrect terminal
No status response.
transmitting.
Set message error.
Sequence terminated.
6. Non contiguous data
No status response.
following status from
Set message error.
RTB.
Sequence terminated
equal to receive word
Set message error.
7. Invalid data transmitted
No status response.
from RTB.
Set message error.
Sequence terminated.
8. Too few or too many
No status response.
data words.
Set message error.
Sequence terminated.
WRAP AROUND
The wrap around capability is for test purposes only. It will test for
transfers to and from the Bus Controller without any sub system
intervention.
The wrap around sequence will commence on receipt of a valid
receive command word containing the wrap around subaddress
(1E) providing the WRAPEN input is set high. The data received
is stored in the data buffer memory and the device will respond
with status. The Bus Controller will then send a transmit command
to subaddress 1E and the data contained in the memory will be
transmitted following the status.
For the test to operate correctly the number of data words to be
transmitted must be the same as the number received.
1. Invalid receive command.
No response.
Command ignored.
2. Invalid data word.
No status response.
Set message error.
Sequence terminated.
3. Non contiguous data.
No status response.
Set message error.
Sequence terminated.
4. Too few or too many
No status response.
data words.
Set message error.
Sequence terminated
5. Invalid transmit
No response.
command.
Command ignored.
6. Transmit command
No status response.
followed by another
Set message error.
word.
Sequence terminated
7.Transmit Broadcast
No status response.
address.
Set message error.
Set broadcast.
Sequence terminated.
8. Transmit word count not
No data transmission.
count.
Sequence terminated.
DYNAMIC BUS CONTROL (00)
The device will respond with status.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. Broadcast address.
No status response.
Set message error.
Set broadcast.
Sequence terminated.
5. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
SYNC
CMD
*
STATUS
TX ST
CMD
*
STATUS
I.S.T
CMD
*
STATUS
TX DIS
CMD
*
STATUS
11
SCDCT2578 REV B 3/11/98
SYNCHRONIZE WITHOUT DATA WORD (01)
INITIATE SELF TEST (03)
The device will respond with status. The NSYNC signal will go
active low for 500 nS. Throughout this period the highway T0-
T15 will be zero and remain at zero until the next command is
received.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
TRANSMIT STATUS (02)
The status register is not cleared or loaded before it is transmitted,
i.e. it contains the resulting status from the previous command.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. Broadcast address.
No status response.
Set message error.
Set broadcast.
Sequence terminated.
5. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
The device will respond with status..
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
TRANSMITTER SHUTDOWN (04)
The device will respond with status and shutdown the transmitter
on the alternate bus, thus inhibiting any further transmission on that
bus.
Once a transmitter has been shutdown it can only be reactivated by
the mode commands 'Override Transmitter Shutdown' or 'Reset
Remote Terminal'.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
TX EN
CMD
*
STATUS
INH TF
CMD
*
STATUS
EN TF
CMD
*
STATUS
RESET
CMD
*
STATUS
12
SCDCT2578 REV B 3/11/98
OVERRIDE TRANSMITTER SHUTDOWN (05)
OVERRIDE INHIBIT TERMINAL FLAG (07)
The device will respond with status and reactivate a shutdown
The device will respond with status and then reactivate the
transmitter on the alternate bus.
Terminal Flag bit of the status register.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
INHIBIT TERMINAL FLAG (06)
The device will respond with status and then inhibit any further
setting of the Terminal Flag bit of the status.
Once the Terminal Flag bit has been inhibited it can only be
reactivated by the mode commands 'Override Inhibit Terminal
Flag' or 'Reset Remote Terminal'.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
RESET REMOTE TERMINAL (08)
The device will respond with status after which the bidirectional
signal NRES to the subsystem will go active low for 500 nS.
Transmitter Shutdown mode commands and Inhibit Terminal Flag
mode command will be reactivated.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
RESVD
CMD
*
STATUS
TX VW
CMD
VW
*
STATUS
SYNC
CMD
DATA
*
STATUS
CMD
*
STATUS
TX LST
LST
CMD
13
SCDCT2578 REV B 3/11/98
RESERVED MODE CODES (09-0F)
SYNCHRONIZE WITH DATA WORD (11)
The status is not cleared or loaded before it is transmitted with the
message error bit set.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
TRANSMIT VECTOR WORD (10)
On receipt of a valid Command to transmit the Vector Word the
device will initially respond with Status.
After the Status response has been initiated the Vector Word will
be enabled onto T0-T15 from the subsystem with signal NENVW
and transferred to the Output Buffer ready for transmission onto the
1553 data bus following the Status.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. Broadcast address.
No status response.
Set message error.
Set broadcast.
Sequence terminated.
5. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
The Synchronize data word received is stored in the data buffer
memory until message validation is complete after which the
device will respond with Status.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
After the Status response has been initiated the Synchronize Word
will be transferred to the subsystem. The NSYNC signal will go
active low for 500 nS during which time T0-T15 will be set to the
data word received.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command not followed
No status response.
contiguously by data
Set message error.
word
Sequence terminated.
3. Command followed by
No status response.
too many words.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to one.
Set message error.
Sequence terminated.
5. T/R bit of command set
No status response.
to one and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.

TRANSMIT LAST COMMAND (12)
The status response contains the resulting status from the previous
command.
The data word transmitted following the status word contains the
previous valid command (provided it was not Transmit Last
Command).
CMD
*
STATUS
TX BIT
BIT
WORD
TX DIS
CMD
DATA
*
STATUS
TX EN
CMD
DATA
*
STATUS
14
SCDCT2578 REV B 3/11/98
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. Broadcast address.
No status response.
Set message error.
Set broadcast.
Sequence terminated.
5. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
Error Conditions
Action taken by device
address
Set broadcast.
Sequence terminated.
TRANSMIT BIT WORD (13)
On receipt of a valid Command to transmit the BIT Word the
device will respond with Status followed by the BIT word, after
which the BIT register is cleared.
Bits 2 to 15 are always zero. Bit 1 is set if the subsystem sends too
many NSSTRB's.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
3. T/R bit of command set
No status response.
to zero.
Set message error.
Sequence terminated
4. Broadcast address.
No status response.
Set message error.
Set broadcast.
Sequence terminated.
5. T/R bit of command set
No status response.
to zero and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
SELECTED TRANSMITTER SHUTDOWN (14)
This mode command is not normally used in dual redundant
systems.
The device will respond with status and shut down the transmitter
on the bus designated by the two least significant bits of the data
word.
The bus addresses of the device are channel 0 - 00, channel
1 - 01. If the command is received on the same bus as the
designated shut down bus then the device will respond with status
and no shut down will occur.
Once a transmitter has been shut down it can only be reactivated by
an 'Override Shutdown Command' or 'Reset Remote Terminal'.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
1. Invalid command.
No response.
Command ignored.
2. Command not followed
No status response.
contiguously by data
Set message error.
word
Sequence terminated.
3. Command followed by
No status response.
too many words.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to one.
Set message error.
Sequence terminated.
5. T/R bit of command set
No status response.
to one and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.

OVERRIDE SEL TRANSMITTER SHUTDOWN (15)
This mode command is not normally used in dual redundant
systems.
The device will respond with status and reactivate a shutdown
transmitter on the bus designated by the two least significant bits
of the data word.
The bus addresses of the device are channel 0 - 00 channel
1 - 01. If the command is received on the same bus as the
designated override shutdown bus then the device will respond
with status and no reactivation will occur.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
RESVD
T/R=1
*
STATUS
RESVD
T/R=0
DATA
*
STATUS
NVCR
5
8
6
7
T0-T15
STATUS
NDATA
NHDR
4
1
STATUS
T0-T15
2
3
NCMDSTRB
1
3
C1MHZ
4
T0-T15
2
1
NCMDSTRB
3
C1MHZ
T0-T15
NSSTRB
5
6
1
2
15
SCDCT2578 REV B 3/11/98
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command not followed
No status response.
contiguously by data
Set message error.
word
Sequence terminated.
3. Command followed by
No status response.
too many words.
Set message error.
Sequence terminated
4. T/R bit of command set
No status response.
to one.
Set message error.
Sequence terminated.
5. T/R bit of command set
No status response.
to one and broadcast
Set message error.
address
Set broadcast.
Sequence terminated.
RESERVED MODE CODES (16-1F)
The status is not cleared or loaded before it is transmitted with the
message error bit set.
If the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
Action taken by device
T/R=1
1. Invalid command.
No response.
Command ignored.
2. Command followed by
No status response.
another word.
Set message error.
Sequence terminated.
T/R=0
3. Invalid command.
No response.
Command ignored.
4. Command not followed
No status response.
contiguously by data
Set message error.
word.
Sequence terminated.
5. Command followed by
No status response.
too many data words.
Set message error.
Sequence terminated.
DETAILED TIMING
MIN MAX UNIT
1. NVCR pulse duration
500
650
nS
2. NVCR to T0-T15 valid
250
nS
3. NVCR to T0-T15 invalid
250
nS
4. NVCR to discrete status inputs (not rec)
600
nS
5. NDATA & NHDR pulse duration
475
525
nS
6. T0-T15 valid to NDATA & NHDR
250
nS
7. NDATA & NHDR to T0-T15 invalid 250
nS
8. Last NDATA to discrete status inputs (rec)
250
nS
MIN
MAX UNIT
1. C1MHZ to NCMDSTRB
75
nS
2. NCMDSTRB duration
8475
8525 nS
3. T0-T15 valid to NCMDSTRB
100
nS
4. NCMDSTRB to T0-T15 invalid
100
nS
NCMDSTRB
3
C1MHZ
T0-T15
NDATAST
4
5
1
2
T0-T15
NENVW
6
5
T0-T15
NRES/NSYNC
1
2
3
NDATA
P
Transformer coupled
DATA
P'
0.75Zo
0.75Zo
1:1.79
1:1.4
NDATA
A
Direct coupled
DATA
A'
0.75Zo
0.75Zo
1:2.5
Zo
16
SCDCT2578 REV B 3/11/98
MIN MAX UNIT
1. Rising edge of NCMDSTRB to falling 0.5 10.0 uS
edge of first NSSTRB
2. NSSTRB to next NSSTRB
1.0 16.0 uS
3. Rising edge of C1MHZ to falling edge
75
nS
of NSSTRB
4. Falling edge of C1MHZ to rising edge
75
nS
of NSSTRB
5. Falling edge of NSSTRB to data enabled
75
nS
onto T0-T15 from subsystem
6. Rising edge of NSSTRB to data disabled
75
nS
onto T0-T15 from subsystem
MIN MAX UNIT
1. Rising edge of NCMDSTRB to falling 225 275 nS
edge of first NDATAST
2. NDATAST to next NDATAST
475 525 nS
3. NDATAST pulse duration
225 275 nS
4. Data valid on T0-T15 to NDATAST 100
nS
5. NDATAST to data invalid on T0-T15 100
nS
MIN MAX UNIT
1. NRES/NSYNC pulse duration
475
525
nS
2. T0-T15 valid to NSYNC
50
nS
3. NSYNC to T0-T15 invalid
250
nS
4. NVCR to NRES/NSYNC non bcast 27.9 28.1 uS
NVCR to NRES/NSYNC bcast
8.9
9.1
uS
5. NENVW to T0-T15 valid
250
nS
6. NENVW to T0-T15 invalid
500
nS
7. NENVW is reset by NVCR
16 MHZ CLOCK REQUIREMENT
MIN
MAX
T
40%
60% of cycle
TRANSFORMERS
The device requires a 1:2.5 turns ratio for direct coupling and
1:1.79 turns ratio for transformer coupling. The centre tap of the
transformers must be tied to ground.
The suggested transformer are:-
Technitrol 1553-45
Aeroflex 25T1553-45
17
SCDCT2578 REV B 3/11/98
OPERATING CONDITIONS
ABSOLUTE MAXIMUM RATINGS
V
DD
Supply voltage +7
Volts
V
SS
Supply voltage 0
Volts
V
IH
High level input voltage
V
DD
+0.5
Volts
V
IL
Low level input voltage
V
SS
-0.5
Volts
Operating free air temperature range
-55 to +125
C
Storage temperature range
-65 to +150
C
RECOMMENDED OPERATING CONDITIONS
MIN NOM MAX UNIT
V
DD
Supply voltage
4.75 5.0
5.5
Volts
Free air temperature range
-55
+125
C
ELECTRICAL CHARACTERISTICS
DIGITAL SIGNALS
MIN NOM MAX UNIT
A1. INPUT WITH PULL UP
V
IH
High level input voltage
2.4
oc Volts
V
IL
Low level input voltage
V
SS
0.8 Volts
I
IH
High level input current
10
uA
I
IL
Low level input current
35 65
120
uA
C
IN
Input capacitance
10
pf
A2. INPUT WITH PULL UP
V
IH
High level input voltage
2.4 oc Volts
V
IL
Low level input voltage
V
SS
0.8 Volts
I
IH
High level input current
10
uA
I
IL
Low level input current
450 800 1500
uA
C
IN
Input capacitance
10
pf
B. INPUT WITH PULL DOWN
V
IH
High level input voltage
2.4
V
DD
Volts
V
IL
Low level input voltage
oc 0.8 Volts
I
IH
High level input current
35
65
120
uA
I
IL
Low level input current
10
uA
C
IN
Input capacitance
10
pf
C. OUTPUT
V
OH
High level output voltage
V
DD
-0.5 V
DD
Volts
V
OL
Low level output voltage
0.4
Volts
I
OH
High level output current 2.0 5.5 10.0
mA
I
OL
Low level output current 2.0 5.5
10.0
mA
D. OPEN DRAIN OUTPUT
V
OH
High level output voltage
oc Volts
V
OL
Low level output voltage
0.4 Volts
I
OH
High level output current
10
uA
I
OL
Low level output current 2.0
5.5
10.0
mA
MIN NOM MAX UNIT
E. Not Used
F. INPUT OUTPUT
V
IH
High level input voltage
2.4 V
DD
Volts
V
IL
Low level input voltage
V
SS
0.8
Volts
I
IH
High level input current
10
uA
I
IL
Low level input current
10
uA
C
IN
Input capacitance
10
pf
V
OH
High level output voltage
V
DD
-0.5 V
DD
Volts
V
OL
Low level output voltage
0.4 Volts
I
OH
High level output current 2.0 5.5 10.0
mA
I
OL
Low level output current
2.0 5.5
10.0
mA
I
HZ
High impedance IO current
10
uA
G. INPUT OUTPUT WITH PULL UP
V
IH
High level input voltage
oc
oc
Volts
V
IL
Low level input voltage
V
SS
0.8 Volts
I
IH
High level input current
10
uA
I
IL
Low level input current
450 800 1500
uA
C
IN
Input capacitance
10
pf
V
OH
High level output voltage
V
DD
-0.5 V
DD
Volts
V
OL
Low level output voltage
0.4 Volts
I
OH
High level output current 0.5 1.0 1.8
mA
I
OL
Low level output current 1.5 5.0
9.0
mA
DATA BUS SIGNALS
H. TRANSMITTER
I
O
Driver peak output current
600
mA
V
O
Differential output level
7.0
7.5
9.0
V p-p
point A-A' (R
L
=35 ohms)
on 1760 BUS
T
RF
Rise and fall times
100
200
300
nS
(10%-90% of p-p output)
V
OE
Output offset 2.5 uS after
-90
90
mV
mid bit crossing of parity,
point A-A' (R
L
=35 ohms)
V
O
Differential output level
6.0
7.5
9.0
V p-p
point A-A' (R
L
=35 ohms)
on 1553 BUS
H. RECEIVER
V
IDR
Differential input level
14
20
V p-p
point P-P' (TXFMR-2.12:1)
C
MRR
Common mode rejection
45
dB
ratio
V
TH
Input threshold voltage
0.60
0.82
1.20
V p-p
referred to the bus
(100KHz-1MHz)
18
SCDCT2578 REV B 3/11/98
PIN ASSIGNMENTS -PGA
(2578/81-02-XX-YY-P119)
PGA
SIGNAL
IO TYPE
G12
STREL
(-12 only)
C
F12
NSR
A2
E12
WRAPEN
B
E11
T 0
F
C12
T 1
F
D11
T 2
F
A13
T 3
F
B11
T 4
F
C10
T 5
F
A11
T 6
F
A10
T 7
F
A9
DATABUS 1
H
C8
NDATABUS 1
H
C7
VDD
B7
VSS
C6
NILLCMD
A2
A4
T 8
F
A3
T 9
F
C4
T 10
F
A2
T 11
F
B2
T 12
F
D3
T 13
F
C1
T 14
F
E3
T 15
F
E1
NSYNC
C
F1
MCAIR
B
G3
STATUS
(-12 only)
D
H2
NENCHK
(-12 only)
A1
J2
NVCR
C
J3
NTF
A2
L2
NME
A2
PGA
SIGNAL
IO
TYPE
K3
ADDR E
A1
N1
ADDR D
A1
M3
ADDR C
A1
L4
ADDR B
A1
N3
ADDR A
A1
N4
ADDR P
A1
N5
DATABUS 0
H
L6
NDATABUS 0
H
L7
VDD
M7
VSS
N9
C16MHZ
A2
N10
NDATA
C
M11
NRES
G
L10
NSSTRB
A1
M12
C1MHZ
C
L11
NCMDSTRB
C
K11
NDATAST
C
K12
NENVW
C
J12
NSSFLAG
A2
H11
NBUSY
A2
G13
NHDR
(-12 only)
C
M9
LA
(-12 only)
A1
G1
NVALCHK
(-12 only)
C
F2
N/C
M5
N/C
N8
N/C
H12
N/C
B9
N/C
A6
N/C
A5
N/C
B5
N/C
B4
N/C
B3
N/C
19
SCDCT2578 REV B 3/11/98
PACKAGE OUTLINE
119 Pin PGA
DIMENSIONS (Inches)
REF
MIN
NOM
MAX
A
0.160
-
0.210
A1
0.040
0.050
0.060
b
0.016
0.018
0.020
D
1.280
-
1.335
E
1.280
-
1.335
e1
-
0.100
-
e
-
1.200
-
L
0.110
0.130
0.150
20
SCDCT2578 REV B 3/11/98
N/C = Do not connect
PIN ASSIGNMENTS
(2578/81-02-XX-YY-F84)
CQFP
SIGNAL
IO TYPE
1
T12
F
2
T13
F
3
T14
F
4
T15
F
5
NSYNC
C
6
MCAIR
B
7
NVALCHK (-12 only)
C
8
STATUS (-12 only)
D
9
N/C
10
N/C
11
NENCHK (-12 only)
A1
12
NVCR
C
13
BCST
C
14
NTF
A2
15
N/C
16
N/C
17
NME
A2
18
ADDRE
A1
19
N/C
20
N/C
21
ADDRD
A1
22
ADDRC
A1
23
ADDRB
A1
24
N/C
25
ADDRA
A1
26
N/C
27
N/C
28
ADDRP
A1
29
DATA 0 (BUS)
H
30
NDATA 0 (BUS)
H
31
N/C
32
N/C
33
N/C
34
VDD
35
VSS
36
C16MHZ
A2
37
LA (-12 only)
A1
38
NDATA
C
39
N/C
40
N/C
41
NRES
G
42
NSSTRB
A1
CQFP
SIGNAL
IO TYPE
43
C1MHZ
C
44
NCMDSTRB
C
45
NDATAST
C
46
NENVW
C
47
NSSFLAG
A2
48
NBUSY
A2
49
N/C
50
NHDR (-12 only)
C
51
N/C
52
STREL (-12 only)
C
53
NSR
A2
54
N/C
55
N/C
56
WRAPEN
B
57
N/C
58
T0
F
59
N/C
60
N/C
61
T1
F
62
T2
F
63
N/C
64
N/C
65
N/C
66
T3
F
67
T4
F
68
T5
F
69
N/C
70
T6
F
71
N/C
72
N/C
73
T7
F
74
DATA 1 (BUS)
H
75
NDATA 1 (BUS)
H
76
N/C
77
N/C
78
VDD
79
VSS
80
NILLCMD
A2
81
T8
F
82
T9
F
83
T10
F
84
T11
F
21
SCDCT2578 REV B 3/11/98
CQFP - Flat Package Outline
POWER SUPPLY REQUIREMENTS
CURRENT
MAX
UNIT
Transmitter standby (both channels) 60
mA
25% duty cycle (one channel)
220
mA
50% duty cycle (one channel)
350
mA
POWER DISSIPATION
MAX
UNIT
Transmitter standby (both channels) 0.3
watts
50% duty cycle (one channel)
0.6
watts
100% duty cycle (one channel)
0.9
watts
POWER SUPPLY DECOUPLING
To maximize stabilization of the devices transceivers, a 4.7 uf
and a 0.1 uf capacitor should be connected in parallel from the
+5V supply to ground.
APPLICATION NOTES
CIRCUIT TO TRANSFER DATA FROM SUBSYSTEM
Aeroflex Circuit Technology
SCDCT2578 REV B 3/12/98 Plainview NY (516) 694-6700
22
Ordering Information
Model Number *
MIL-STD-1760
Pinout
McAir
Compliant
DESC
Part Number
Package
CT2578-02-QM-P119
TBD
119 Pin PGA
CT2578-02-XT-P119
TBD
119 Pin PGA
CT2578-02-IN-P119
TBD
119 Pin PGA
CT2578-02-CG-P119
TBD
119 Pin PGA
CT2578-12-QM-P119
TBD
119 Pin PGA
CT2578-12-XT-P119
TBD
119 Pin PGA
CT2578-12-IN-P119
TBD
119 Pin PGA
CT2578-12-CG-P119
TBD
119 Pin PGA
CT2578-02-QM-F84
TBD
84 Lead CQFP
CT2578-02-XT-F84
TBD
84 Lead CQFP
CT2578-02-IN-F84
TBD
84 Lead CQFP
CT2578-02-CG-F84
TBD
84 Lead CQFP
CT2578-12-QM-F84
TBD
84 Lead CQFP
CT2578-12-XT-F84
TBD
84 Lead CQFP
CT2578-12-IN-F84
TBD
84 Lead CQFP
CT2578-12-CG-F84
TBD
84 Lead CQFP
CT2581-02-QM-P119
TBD
119 Pin PGA
CT2581-02-XT-P119
TBD
119 Pin PGA
CT2581-02-IN-P119
TBD
119 Pin PGA
CT2581-02-CG-P119
TBD
119 Pin PGA
CT2581-02-QM-F84
TBD
84 Lead CQFP
CT2581-02-XT-F84
TBD
84 Lead CQFP
CT2581-02-IN-F84
TBD
84 Lead CQFP
CT2581-02-CG-F84
TBD
84 Lead CQFP
*
Screening Code Breakdown
QM = MIL-STD-883 Compliant
XT = Extended Temperature Range (-55C to +125C)
IN = Industrial Temperature Range (-40C to +85C)
CG = Commercial Temperature Range (-0C to +70C)
Aeroflex Circuit Technology
35 South Service Road
Plainview New York 11830
Telephone: (516) 694-6700
FAX: (516) 694-6715
Toll Free Inquiries: 1-(800) 843-1553
Specifications subject to change without notice.
C I R C U I T T E C H N O L O G Y