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參數(shù)資料
| 型號： | CT2565-FP |
| 廠商： | Aeroflex Inc. |
| 英文描述： | CT2565 Bus Controller, Remote Terminal and BUS Monitor FOR MIL-STD-1553B |
| 中文描述： | CT2565總線控制器，遠程終端和總線監(jiān)測的MIL - STD - 1553B總線 |
| 文件頁數(shù)： | 7/31頁 |
| 文件大?。?/td> | 356K |
| 代理商： | CT2565-FP |
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Aeroflex Circuit Technology
7
SCDCT2565 REV B 8/10/99 Plainview NY (516) 694-6700
RTU Response
The addressed RTU(s) must respond (to
non-broadcast commands) within a timeout
period as shown in Figures 7, 8, and 9. Figures
10 and 11 illustrate the BC Mode Code Timing.
Status and data words received from the 1553
port are transferred to the subsystem via a
handshake and memory write operation for each
(See Message Length Checking).
BC Status/Error Handling
Message transfer errors are indicated using the
TIMEOUT, MSGERR, LOOPERR and STATERR
BC status outputs (pins 4, 30, 46 and 68
respectively).
Additional
methods include user evaluation of status, data
and (long) loop words and/or use of the 1553B
dual redundant mode codes. Note that certain
error conditions not reflected in the current
Status Word (SW) can occur; Broadcast CMD
RT-status and post RT status response may be
error
detection
accessed via the Transmit Status Word mode
command.
Transmit Bit Word.
Additional status informa
tion is generated by an RTU (CT2565 for each
transfer in the form of a BIT word). This word
may be accessed by the BC using the
TRANSMIT B-I-T WORD mode command. See
RTU Error Handling and Mode Code sections).
Message Length Checking.
The BC stores the
command word, word-count field in an internal
register. By decrementing this register following
each data word transfer (See BC Memory
Read/Write Timing), the BC can detect an
incorrect message length.
For a description of the possible BC error,
indicators occurring during each stage of
message transfer read from left to right in
Table 4. For a description of the possible causes
of errors within a transfer, read from right to left.
TRANSFER/CONDITION
DESCRIPTION
ERROR SIGNAL
PIN
CONTROL/COMMAND WORD 1
Handshake Failure
Memory read by BC subsystem.
No response to Bus Request within timeout
period.
Looped back through receiver.
Received Word
≠
last xmitted word.
DMA/Write looped word to subsystem.
Status-RT1, data, status-RT2 response
to follow receive, transmit, commands.
BC waits for Grant
(no 1553 timing error)
-
LOOPED WORD
Short Loop Failure
Long Loop Failure
LOOPERR
User Defined
46
-
RT-RT
(See definitions in
STATUS/DATA WORD
below)
-
STATUS WORD
No Status Received within 15.5μS
NODT timeout
TIMEOUT
EOM
STATERR
4
57
68
RT Address Mismatch
Command RTU Address
≠
Status Word
RTU Address
Status Word Response from RT:
Error Condition
Response to Transmit Status Word mode
command may allow this, all others ERROR.
Error Flag(s) Set
STATERR
68
Broadcast Received bit Set
Broadcast Mask not set
(See BC Control Word)
STATERR
68
DATA WORD
Handshake Failure
Transmit Command
Receive Command
No subsystem response to Bus Request.
Data lost: Word Count fails.
1553 transmission gap.
BC waits for Grant.
MSGERR
Status Word response:
STATERR
30
68
Data Received from RTU
Less than word count
Greater than word count
Data after Status Set
(all extra words)
Transmit Command (RTU response)
More data received than requested.
Transmit Command: data words received
after status to subsystem.
MSGERR and EOM
MSGERR and EOM
DMA/memory write
(for each)
4
30
-
FORMAT ERROR
-
MSGERR
30
Notes:
(1) LOOPERR is a .5μS pulse which occurs near DMA handshake for loop back word.
(2) TIMEOUT is a 40/160nS pulse which occurs 19.5μS ±0.5μS after the mid-bit parity of the last word onto the bus.
(3) STATERR is a 120/166nS pulse which occurs during the status word DMA handshake.
(4) MSGRR is a 40/160nS pulse which occurs approximately 100nS before INCMD goes high. It is triggered by NODT going inactive (i.e.,
low word count).
Table 4 – BC Error Handling
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