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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
    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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