參數(shù)資料
    

    


    


    
型號(hào)：
BU-61745F4-670K

    

    
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：
1 X 1 INCH, 0.155 INCH HEIGHT, CERAMIC, FP-72

    

    
文件頁(yè)數(shù)：
18/60頁(yè)

    

    
文件大?。?/td>
700K

    

    
代理商：
BU-61745F4-670K


    

    

    

	
    
    
    

    
    
	
    25
    Data Device Corporation
    www.ddc-web.com
    BU-6174X/6184X/6186X
    Rev. C
    SINGLE BUFFERED MODE
    The operation of the single buffered RT mode is illustrated in
    FIGURE 6. In the single buffered mode, the respective lookup
    table entry must be written by the host processor. Received data
    words are written to, or transmitted data words are read from the
    data word block with starting address referenced by the lookup
    table pointer. In the single buffered mode, the current lookup
    table pointer is not updated by the Enhanced Mini-ACE memory
    management logic. Therefore, if a subsequent message is
    received for the same subaddress, the same Data Word block
    will be overwritten or overread.
    SUBADDRESS DOUBLE BUFFERING MODE
    The Enhanced Mini-ACE provides a double buffering mechanism
    for received data, that may be selected on an individual subad-
    dress basis for any or all receive (and/or broadcast) subad-
    dresses. This is illustrated in FIGURE 7. It should be noted that
    the Subaddress Double Buffering mode is applicable for receive
    data only, not for transmit data. Double buffering of transmit
    messages may be easily implemented by software techniques.
    The purpose of the subaddress double buffering mode is to pro-
    vide data sample consistency to the host processor. This is
    accomplished by allocating two 32-word data word blocks for
    each individual receive (and/or broadcast receive) subaddress.
    At any given time, one of the blocks will be designated as the
    "active "1553 block while the other will be considered as "inac-
    tive". The data words for the next receive command to that sub-
    address will be stored in the active block. Following receipt of a
    valid message, the Enhanced Mini-ACE will automatically switch
    the active and inactive blocks for that subaddress. As a result,
    the latest, valid, complete data block is always accessible to the
    host processor.
    CIRCULAR BUFFER MODE
    The operation of the Enhanced Mini-ACE's circular buffer RT
    memory management mode is illustrated in FIGURE 8. As in the
    single buffered and double buffered modes, the individual lookup
    table entries are initially loaded by the host processor. At the
    start of each message, the lookup table entry is stored in the
    third position of the respective message block descriptor in the
    descriptor stack area of RAM. Receive or transmit data words
    are transferred to (from) the circular buffer, starting at the loca-
    tion referenced by the lookup table pointer.
    In general, the location after the last data word written or read
    (modulo the circular buffer size) during the message is written to
    the respective lookup table location during the end-of-message
    sequence. By so doing, data for the next message for the respec-
    tive transmit, receive(/broadcast), or broadcast subaddress will
    be accessed from the next lower contiguous block of locations in
    the circular buffer.
    For the case of a receive (or broadcast receive) message with a
    data word error, there is an option such that the lookup table
    pointer will only be updated following receipt of a valid message.
    That is, the pointer will not be updated following receipt of a
    message with an error in a data word. This allows failed mes-
    sages in a bulk data transfer to be retried without disrupting the
    circular buffer data structure, and without intervention by the
    RT's host processor.
    GLOBAL CIRCULAR BUFFER
    Beyond the programmable choice of single buffer mode, double
    buffer mode, or circular buffer mode, programmable on an indi-
    vidual subaddress basis, the Enhanced Mini-ACE RT architec-
    FIGURE 6. RT SINGLE BUFFERED MODE
    DATA
    BLOCKS
    DATA BLOCK
    BLOCK STATUS WORD
    TIME TAG WORD
    DATA BLOCK POINTER
    RECEIVED COMMAND
    WORD
    DESCRIPTOR
    STACKS
    LOOK-UP
    TABLE ADDR
    LOOK-UP TABLE
    (DATA BLOCK ADDR)
    15
    13
    0
    CURRENT
    AREA B/A
    CONFIGURATION
    REGISTER
    STACK
    POINTERS
    (See note)
    Note: Lookup table is not used for mode commands when enhanced mode codes are enabled.
    
    
    
    
    
    


    


    

    相關(guān)PDF資料
    		

    PDF描述
    		

    
    

    
BU-61745F4-680K
2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72

    

    
BU-61745F4-680Y
2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72

    

    
BU-61745F4-680Z
2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72

    

    
BU-61745F4-690L
2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72

    

    
BU-61745F4-690
2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQFP72

    

    

    

    


    


    

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