參數(shù)資料
型號(hào)： BU-62743G3-492L
廠商： DATA DEVICE CORP
元件分類(lèi)： 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 INCH, CERAMIC, QFP-72
文件頁(yè)數(shù)： 54/99頁(yè)
文件大?。?/td> 578K
代理商： BU-62743G3-492L
Data Device Corporation
62743_pre7_noSA-DB.DOC
www.ddc-web.com
8-07-02
58
Figure 7. RT Circular Buffered Mode
RT DESCRIPTOR STACK
The descriptor stack provides a chronology of all messages processed by the PCI
Enhanced Mini-ACE RT. Reference Figure 6 and Figure 7. Similar to BC mode,
there is a four-word block descriptor in the Stack for each message processed.
The four entries to each block descriptor are the Block Status Word, Time Tag
Word, the pointer to the start of the message’s data block, and the 16-bit received
Command Word.
The RT Block Status Word includes indications of whether a particular message is
ongoing or has been completed, what bus channel it was received on, indications
of illegal commands, and flags denoting various message error conditions. For the
subaddress circular buffering and global circular buffering modes, the data block
pointer may be used for locating the data blocks for specific messages. Note that
for mode code commands, there is an option to store the transmitted or received
data word as the third word of the descriptor, in place of the data block pointer.
The Time Tag Word provides a 16-bit indication of relative time for individual
messages. The resolution of the PCI Enhanced Mini-ACE’s time tag is
programmable from among 2, 4, 8, 16, 32, or 64 s/LSB. There is also a provision
for using an external clock input for the time tag (consult factory). If enabled, there
is a time tag rollover interrupt, which is issued when the value of the time tag rolls
CIRCULAR
BUFFER
ROLLOVER
15
13
0
RECEIVED
(TRANSMITTED)
MESSAGE
DATA
(NEXT LOCATION)
128,
256
8192
WORDS
POINTER TO
CURRENT
DATA BLOCK
POINTER TO
NEXT DATA
BLOCK
LOOK-UP TABLE
ENTRY
CIRCULAR
DATA
BUFFER
LOOK-UP TABLES
LOOK-UP
TABLE
ADDRESS
BLOCK STATUS WORD
TIME TAG WORD
DATA BLOCK POINTER
RECEIVED COMMAND
WORD
CONFIGURATION
REGISTER
STACK
POINTERS
DESCRIPTOR
STACK
CURRENT
AREA B/A
1. TX/RS/BCST_SA look-up table entry is updated following valid receive (broadcast) message
or following completion of transit message
Notes:
*
2. For the Global Circular Buffer Mode, the pointer is read from and re-written to Address 0101 (for Area A)
or Adress 0105 (for Area B).
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