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參數(shù)資料
| 型號(hào)： | CT1999 |
| 廠商： | Aeroflex Inc. |
| 英文描述： | CT1999 Remote Terminal and/or Bus Controller for MIL-STD-1553B |
| 中文描述： | CT1999遠(yuǎn)程終端和/或總線控制器的MIL - STD - 1553B總線 |
| 文件頁數(shù)： | 9/25頁 |
| 文件大?。?/td> | 259K |
| 代理商： | CT1999 |
Aeroflex Circuit Technology
SCDCT1999 REV B 8/14/01 Plainview NY (516) 694-6700
9
CMSYNC
SOURCE
Command Word Sync
- This line goes low if a command word sync and two
Manchester biphase bits are valid.
NDRQ
SOURCE
No Data Required
- This line goes low if the encoder transmit buffer is full i.e.
another word is going to be transmitted. This signal is for information only and
must not be used to enable data from the subsystem.
PASMON
SINK
Passive Monitor
- When functioning as a Bus Controller this line acts as a
passive monitor select. The active going edge of this line will cause the
REQBUS lines to be latched and that bus, now selected will be monitored so
long as PASMON remains low. All traffic on the bus will be handed, after
validation, to the subsystem via STATSTB for status and commands words,
and RMDSTB for data words.
BCOPSTB
SINK
Bus Controller Operation Strobe
- When functioning as a Bus Controller a
low going pulse on this line will initiate the selected bus controller operation on
the requested bus, using BCOPA&B and REQBUSA&B.
BCOPA
SINK
Bus Control Operation A
- Least significant bit of the bus controller operation
select lines.
BCOPB
SINK
Bus Control Operation B
- Most significant bit of the bus controller operation
select lines.
REQBUS A
SINK/SOURCE
Request Bus A
- This line,wwhen in RT mode, is the least significant bit of the
bus request lines which specify the origin of the command, ie. they are
sources. When in BC mode these lines are sinks and specify which bus is to be
used for the next command.
REQBUS B
SINK/SOURCE
Request Bus B
- Most significant bit of the bus request lines. (See above for
description.)
RT/BC
SINK
Remote Terminal/Bus Control
- This line when high causes the ASIC to
function as a remote terminal. When low the ASIC functions as a bus controller
or passive monitor.
DBCACC
SINK
Dynamic Bus Control Accept
- This line should be permanently tied low if a
subsystem is able to accept control of the bus if offered.
LTFAIL
SOURCE
Loop Test Fail
- This line goes low if any error in the transmitted waveform is
detected or if any parity error in the hardwired RT address is detected.
ERROR
SOURCE
Error
- This line latches low if a Manchester or parity error is detected. It is
reset by the next CMSYNC (RT mode) and also by RTO in the BC mode.
RTO
SOURCE
Reply Time Out
- This signal will pulse low whenever the reply time for a
transmitting terminal has been exceeded. This line is intended for the bus
controller use.
TXTO
SOURCE
Transmitter Time Ou
t - This line goes true if the transmitter time out limits are
exceeded.
PARER
SOURCE
Parity Error
- This line will pulse low if a parity error is detected by the
decoder.
MANER
SOURCE
Manchester Error
- This line will pulse low if a Manchester error is detected by
the decoder.
DBCREQ
SOURCE
Dynamic Bus Control Request
- This line will pulse low when the status reply
for a mode code Dynamic Bus Control has finished where the accept bit was
set.
VALD
SOURCE
Valid Data - This line will pulse low when a valid data word is received.
Pin Description (Cont.)
Signal
Hybrid
Sink or Source
Signal Description
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