CT2565 Datasheet, PDF (20/31 Pages) Aeroflex Circuit Technology – CT2565 Bus Controller, Remote Terminal and BUS Monitor FOR MIL-STD-1553B

Simultaneous Transmission
Transmissions appearing simultaneously on
alternate 1553-bus channels will be captured by
CT2565 sequentially providing that each
BUSREQ is answered by the subsystem with a
BUSGRNT within the handshake timeout period.
RESET Signal
Pulsing RESET low will suspend MT operation by
(1) INCMD goes high (EOM goes low on the rising
edge) and (2) the CT2565 enters an idle state.
MT operation may be restored by pulsing
BCSTART low (above) or another mode of
operation may be selected (See Table 2).
Handshake Failure
Note that a handshake failure will abort the
current transfer. Monitoring will resume upon
receipt of a valid word on the 1553 bus.
MODE CODES
Nine of the 13 available, dual redundant mode
codes are handled by the CT2565 without user
intervention. Of the four remaining codes,
Dynamic Bus Control and Synchronize (no data)
require subsystem notification. The remaining
two mode codes, Transmit Vector Word and
Synchronize (with data) involve data transfer with
the subsystem. Mode command illegalization and
handling are detailed in the RTU Operation
section and listed in Table 8.
BUSREQ (19)
BUSGRNT (45)
BUSACK (59)
WR (44)
CS (17)
ADRINC (49)
D0 - D15
t1
t2
t3
t4
t6
t6
t5
t6
t8
t8
t9
t7
t10
DATA VALID
ID-WORD VALID
CYCLE
Handshake
Write Only
SYM
t1
t2
t3
t4
t5
t6
t7
t8
t9
t10
Aeroflex Circuit Technology
DESCRIPTION
BUSREQ to BUSGRNT delay
BUSGRNT pulse width
BUSGRNT to BUSACK delay
BUSACK to WR delay
WR to CS time
WR and CS pulse width
DATA VALID setup
CS to ADRINC delay
ARINC pulse width
ID WORD VALID setup
Figure 22 – MT Transfer Timing
20
MIN
0
166
?
320
-
150
-
-
80
-
TYP
-
-
-
330
-
166
-
-
-
-
MAX
800
-
?
370
25
175
50
25
166
100
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
SCDCT2565 REV B 8/10/99 Plainview NY [phone]