參數(shù)資料
型號(hào)： BU-61843G3-472Y
廠商： DATA DEVICE CORP
元件分類： 微控制器/微處理器
英文描述： 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72
封裝： 25.40 X 25.40 MM, 2.54 MM HEIGHT, CERAMIC, QFP-72
文件頁(yè)數(shù)： 14/60頁(yè)
文件大?。?/td> 457K
代理商： BU-61843G3-472Y
21
Data Device Corporation
www.ddc-web.com
BU-6174X/6184X/6186X
F-10/02-300
BC MESSAGE SEQUENCE CONTROL
The Enhanced Mini-ACE/-ACE BC message sequence control
capability enables a high degree of offloading of the host proces-
sor. This includes using the various timing functions to enable
autonomous structuring of major and minor frames. In addition,
by implementing conditional jumps and subroutine calls, the
message sequence control processor greatly simplifies the
insertion of asynchronous, or "out-of-band" messages.
Execute and Flip Operation. The Enhanced Mini-ACE/-ACE
BC's XQF, or "Execute and Flip" operation, provides some
unique capabilities. Following execution of this unconditional
instruction, if the condition code tests TRUE, the BC will modify
the value of the current XQF instruction's pointer parameter by
toggling bit 4 of the pointer. That is, if the selected condition flag
tests true, the value of the parameter will be updated to the
value = old address XOR 0010h. As a result, the next time that
this line in the instruction list is executed, the Message
Control/Status Block at the updated address (old address XOR
0010h) will be processed, rather than the one at the old address.
The operation of the XQF instruction is illustrated in FIGURE 4.
There are multiple ways of utilizing the "execute and flip" instruc-
tion. One is to facilitate the implementation of a double buffering
data scheme for individual messages. This allows the message
sequence control processor to "ping-pong" between a pair of
data buffers for a particular message. By doing so, the host
processor can access one of the two Data Word blocks, while the
BC reads or writes the alternate Data Word block.
A second application of the "execute and flip" capability is in con-
junction with message retries. This allows the BC to not only
switch buses when retrying a failed message, but to automati-
cally switch buses permanently for all future times that the same
message is to be processed. This not only provides a high
degree of autonomy from the host CPU, but saves BC band-
width, by eliminating the need for future attempts to process
messages on an RT's failed channel.
XQF
POINTER
XX00h
(part of) BC INSTRUCTION LIST
MESSAGE
CONTROL/STATUS
BLOCK 0
DATA BLOCK 0
XX00h
MESSAGE
CONTROL/STATUS
BLOCK 1
DATA BLOCK 1
POINTER
FIGURE 4. EXECUTE and FLIP (XQF) OPERATION
相關(guān)PDF資料
PDF描述
BU-61843G3-482Y 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72
BU-61843G3-490L 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72
BU-61843G3-490Q 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72
BU-61843G3-490W 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72
BU-61843G3-492Q 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72
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