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參數(shù)資料
| 型號： | BU-61745G3-572W |
| 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, 3.94 MM HEIGHT, CERAMIC, FP-72 |
| 文件頁數(shù)： | 14/60頁 |
| 文件大?。?/td> | 700K |
| 代理商： | BU-61745G3-572W |
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21
Data Device Corporation
www.ddc-web.com
BU-6174X/6184X/6186X
Rev. C
BC MESSAGE SEQUENCE CONTROL
The BC Enhanced Mini-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 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
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