CT2565 Aeroflex Circuit Technology, CT2565 Datasheet - Page 16

• Manufacturer Part Number: CT2565
• Description: CT2565 Bus Controller/ Remote Terminal and BUS Monitor FOR MIL-STD-1553B
• Manufacturer: Aeroflex Circuit Technology

Aeroflex Circuit Technology
Use of Status Word
The status word may be captured by the
subsystem as it is transmitted to the 1553 port by
pulsing BUFENA (pin 58) low during STATEN (pin
3:
approximately 50ns after the falling edge of
BUFENA.
non-broadcast
TRANSMIT STATUS WORD mode command.
Note that the status word may be transmitted prior
to an error condition (See Transmit CMD). These
conditions will be indicated in the "next" status
word and may be monitored if the BC requests the
SW before it is altered (See Mode Commands).
Subsystem Control
The CT2565 allows the subsystem total control
over the status word flags using the inputs
indicated in Table 7.
BIT Word
The BIT Word (Built-In-Test) becomes available in
response to a TRANSMIT BIT WORD mode
command
information (See Figure 19) to that provided by the
status word. The subsystem may capture the BIT
word on the parallel data bus by pulsing BUFENA
HANDSHAKE
(REQ, GRNT, ACK)
MEM-WRITE
(CS, WR, ADRINC)
BCSTRCV (75)
STATEN (3)/
BUFFENA (58)
WC
520ns low pulse).
CHA/CHB (16)
NRGRNT (42)
0-4
NODT (71)
INCMD (9)
1553 BUS
SOM (78)
EOM (57)
D0 - D15
T/R (15)
and
This
message
CMD RT
provides
166ns
1.5µs
corresponds
A
5.5±0.5µs
Figure 16 – RT Receive Command Timing
Data becomes valid
RCV P DATA
transfers
additional
3.4±0.5µs
0.5µs
3.2±0.5µs
667ns
CMD
Note: All timing is typical unless otherwise noted.
(16 BITS)
with
and
status
P
the
all
16
3.9µs
7.5±0.5µs
DATA
(pin 58) low during BITEN (pin 43: approximately
520ns
approximately 50ns after the falling edge of
BUFENA.
cannot be altered by the subsystem.
PIN
Table 7 – Subsystem Control of RT-Status
#
6
7
8
10 SSER
47 SSBUSY
48 ILLCMD
10.75±0.75µs
REF
DBACCEPT
SSFLAG
SVCREQ
SYMBOL
low
STAT
Like the status word, the BIT word
pulse).
4µs
STAT
SCDCT2565 REV B 8/10/99 Plainview NY [phone]
5.5±0.5µs
RT accepts BC operation
responsibility (See Table 2).
Transmitted data may be
invalid sets SSFLAG bit.
Service Request; see
Transmit Vector mode
command.
RTU fault exists: sets
TERMINAL FLAG bit.
Subsystem cannot service
1553 request at this time.
Mode command subsystem
illegalization: Sets MSGERR
bit, doesn’t suppress status
word.
RT
Data
A
DESCRIPTION
P
4.5±0.5µs
Becomes
7.5±0.5µs
400ns
valid