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參數(shù)資料
| 型號： | BU-62843 |
| 英文描述： | MIL-STD-1553 Components |PCI-Enhanced Mini-ACE? |
| 中文描述： | 符合MIL - STD - 1553器件|的PCI增強(qiáng)迷你ACE論壇？ |
| 文件頁數(shù)： | 31/56頁 |
| 文件大?。?/td> | 368K |
| 代理商： | BU-62843 |
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31
Data Device Corporation
www.ddc-web.com
BU-62743/62843/62864
A-03/03-1M
CIRCULAR BUFFER MODE
The operation of the PCI Enhanced Mini-ACE's circular buffer RT
memory management mode is illustrated in FIGURE 7. As in the
single buffered mode, the individual lookup table entries are ini-
tially loaded by the host processor. At the start of each message,
the lookup table entry is stored in the third position of the respec-
tive 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 location 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 mes-
sage with an error in a data word.This allows failed messages 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 or circu-
lar buffer mode, programmable on an individual subaddress
basis, the PCI Enhanced Mini-ACE RT architecture provides an
additional option, a variable sized global circular buffer.
In the global circular buffer mode, the data for multiple receive
subaddresses is stored in the same circular buffer data structure.
The size of the global circular buffer may be programmed for
128, 256, 512, 1024, 2048, 4096, or 8192 words, by means of
bits 11, 10, and 9 of Configuration Register #6. As shown in
TABLE 56, individual subaddresses may be mapped to the glob-
al circular buffer by means of their respective subaddress control
words.
The pointer to the Global Circular Buffer will be stored in location
0101 (for Area A), or location 0105 (for Area B).
The global circular buffer option provides a highly efficient
method for storing received message data. It allows for frequent-
ly used subaddresses to be mapped to individual data blocks,
while also providing a method for asynchronously received mes-
sages to infrequently used subaddresses to be logged to a com-
mon area.Alternatively, the global circular buffer provides an effi-
cient means for storing the received data words for all subad-
dresses. Under this method, all received data words are stored
chronologically, regardless of subaddress.
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
RECEIVWORD
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
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).
Notes:
*
FIGURE 7. RT CIRCULAR BUFFERED MODE
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