BCRT-ACA ETC1 [List of Unclassifed Manufacturers], BCRT-ACA Datasheet - Page 20

• Manufacturer Part Number: BCRT-ACA
• Description: BCRT Bus Controller/Remote Terminal/Monitor
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

STATUS OUTPUTS
RTI-20
RCS
RRD/RWR
COMSTR
TIMERON
MES ERR
CH A/B
XMIT
RCV
BRDCST
STATUS
NAME
LCC
43
45
22
41
49
26
38
51
36
23
PIN NUMBER
PGA
G11
D10
H11
B11
E11
J11
L6
F9
J6
J7
TYPE
TO
TO
TO
TO
TO
TO
TO
TO
TO
TO
ACTIVE
AH
AH
AL
AL
AL
AL
AL
AL
--
--
RAM Chip Select. Active low output used to
enable memory for access.
RAM Read/Write. High output enables memory
read, low output enables memory write, used in
conjunction with RCS). Normally high output.
Command Strobe. COMSTR is an active low
output of 500ns duration identifying receipt of a
valid command.
Fail-safe Timer. The TIMERON output pulses
low for 730ms when the RTI begins transmit-
ting (i.e., rising edge of STATUS) to provide a
fail-safe timer meeting the requirements of
MIL-STD-1553B. This pulse is reset when
COMSTR goes low or during Master Reset. in
the external self-test mode TIMERON does not
recognize COMSTR and resets after 730ms.
Message Error. The active high MES ERR out-
put signals that the Message Error bit in the Sta-
tus Register has been set due to receipt of an
invalid command or an error during message
sequence. MES ERR will reset to logic zero on
receipt of next valid command.
Channel A/B. Output identifying the channel on
which the most recent valid command was
received. Channel A = 1, Channel B = 0.
Transmit. Active low output identifies a
transmit command message transfer by the RTI
is in progress.
Receive. Active low output identifies a receive
command message transfer by the RTI is in
progress.
Broadcast. BRDCST is an active low output
that identifies receipt of a valid broadcast com-
mand.
Status. Active high output pulse indicating that
the RTI is in the process of transmitting a status
word.
DESCRIPTION