
8
~ ~
1553 BUS
CMD 1514131211 10 9 8 7 6 54 32 10 P DATA 15 1413 12 1110 9 87 6 5 43 21 0 P DATA 15141312 1110 9 87 6 5 4 32 1 0 P
RECEIVE 2 WORDS
3.4 ± 5
s
3.5 ± 5
s
300ns max
100-150ns
200ns min
3.4 ± 5
s
10.5 ± 5
s
~ ~
NBGT
INCMD
DTREQ
DTGRT
DTACK
R/W
DTSTR
A10 (T/R BIT)
DAT/CMD
A9-A5
200-400ns
PREV SUB
PREVIOUS
WORD COUNT
COMMAND WORD SUBADDRESS FIELD
A4-A0
D15-D0
STATEN
GBR
BITEN
ME
HS FAIL
RTFAIL
START OF NEW
COMMAND WORD
INITIALIZATION
A10-A0
ARE VALID
(COMMAND
WORD)
ILLCMD STROBED IN
A4-A0 0 (CURRENT
WORD COUNTER)
RTU REQUESTS DATA
BUS FOR COMMAND
WORD TRANSFER
200ns min
100-150ns
825-925ns
100-150ns
2.85s max
2.1s max
300ns max
50ns min
450-550ns
PREVIOUS
MESSAGE
WORD
COUNT
note 7
100ns max
CURRENT WORD COUNT = 00000
100ns max
825-925ns
COMMAND WORD
TRANSFER TO SUBSYSTEM
475-550ns
RTU DATA VALID
225-275ns
50ns min
225-275ns
1st DATA WORD IS
RECEIVED &
VAILDATED
RTU REQUESTS DATA
BUS FOR DATA WORD
TRANSFER
STATUS INPUTS
STROBED IN
DTGRT IS
RECOGNIZED
note 7
100ns max
250ns min Setup time
HOLD TIME 600ns min
SRQ
BUSY
SSFLAG
ADBC
RTFLAG
DTGRT IS
RECOGNIZED
DATA TRANSFER
STARTS
1st DATA WORD
TRANSFER
FIGURE 4. RECEIVE TIMING DIAGRAM