CT2554 Aeroflex Circuit Technology, CT2554 Datasheet - Page 12

• Manufacturer Part Number: CT2554
• Description: Ct2553 / 2554 / 2555 / 2556 Advanced Integrated Mux Aim Hybrid For Mil-std-1553
• Manufacturer: Aeroflex Circuit Technology

Aeroflex Circuit Technology
TIME TAGGING (OPTIONAL)
The CT2553 will automatically access an external,
3-state device (i.e., counter) at the start and end of
each message in BC or RTU modes. The CT2553
output, TAGEN (pin 76), enables the device's output
onto the common, 16-bit data highway while
executing a memory-write cycle. The device's value
is written into the second location of the Descriptor
Stack Entry. If a counter is used its clock, enable,
and reset control lines are connected per system
requirement (See Figure 15). If no external device is
attached to the data bus, an expected value of FFFF
(H) will be written into the Time Tag location within
the Descriptor Stack.
Note that the 8-bit Time Tag value generated in the
1553 MT mode of operation is implemented using
an 8-bit counter internal to the CT2553 (See MT
operation).
BROADCAST
BROADCAST
BROADCAST
COMMAND
COMMAND
COMMAND
CONTROL
(NO DATA)
(NO DATA)
LOOPED
WORD
BACK
DATA WORD
DATA WORD
DATA WORD
DATA WORD
COMMAND
CONTROL
DATA BLOCK
RECEIVE
LOOPED
RECEIVE
STATUS
WORD
RECEIVE
LAST
LAST
BACK
1
2
DATA BLOCK
DATA WORD
DATA WORD
DATA WORD
TRANSMIT
TRANSMIT
COMMAND
TRANSMIT
COMMAND
RECEIVED
Figure 16 – BC Message Formats
CONTROL
LOOPED
STATUS
WORD
BACK
LAST
1
2
TERMINAL TO
DATA BLOCK
FROM XMTR
DATA WORD
1 RECEIVED
DATA WORD
2 RECEIVED
LAST DATA
COMMAND
COMMAND
COMMAND
TRANSMIT
TRANSMIT
RECEIVED
RECEIVER
CONTROL
TERMINAL
RECEIVE
LOOPED
WORD 2
REMOTE
REMOTE
STATUS
WORD 1
STATUS
WORD
WORD
FROM
BACK
12
DATA BLOCK
MODE CODE
DATA WORD
DATA WORD
WITH DATA
DATA BUS
COMMAND
CONTROL
RECEIVE
D15 - D00
LOOPED
FORMAT
STATUS
WORD
WORD
MODE
BACK
CPU
Figure 15 – BC/RT Tagging (Optional)
DATA BLOCK
MODE CODE
DATA WORD
COMMAND
COMMAND
WITH DATA
TRANSMIT
RECEIVED
CONTROL
LOOPED
FORMAT
STATUS
OE
WORD
MODE
WORD
MODE
BACK
D15 - D00
SCDCT2553 REV B 8/6/99 Plainview NY [phone]
DATA
BUS
THREE-STATE
COUNTER
MODE CODE
COMMAND
COMMAND
CONTROL
WITHOUT
LOOPED
STATUS
WORD
MODE
MODE
WORD
BACK
DATA
IOEN
OE
BROADCAST
BROADCAST
DATA WORD
WORD LAST
DATA WORD
DATA WORD
WITH DATA
COMMAND
COMMAND
CONTROL
LOOPED
TAGEN
WORD
BACK
DATA
1
2
CT2553