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參數(shù)資料
| 型號： | BU-62743F3-170W |
| 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 INCH, CERAMIC, QFP-72 |
| 文件頁數(shù)： | 32/99頁 |
| 文件大?。?/td> | 578K |
| 代理商： | BU-62743F3-170W |
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Data Device Corporation
62743_pre7_noSA-DB.DOC
www.ddc-web.com
8-07-02
38
BUS CONTROLLER (BC) ARCHITECTURE
The BC functionality for the PCI Enhanced Mini-ACE includes two separate
architectures: (1) the older, non-Enhanced mode, which provides complete
compatibility with the previous ACE and Mini-ACE (Plus) generation products;
and (2) the newer, Enhanced BC mode. The Enhanced BC mode offers several
new powerful architectural features. These include the incorporation of a highly
autonomous BC message sequence control engine, which greatly serves to
offload the operation of the host CPU.
The Enhanced BC’s message sequence control engine provides a high degree
of flexibility for implementing major and minor frame scheduling; capabilities for
inserting asynchronous messages in the middle of a frame; to separate 1553
message data from control/status data for the purpose of implementing double
buffering and performing bulk data transfers; for implementing message retry
schemes, including the capability for automatic bus channel switchover for failed
messages; and for reporting various conditions to the host processor by means
of 4 user-defined interrupts and a general purpose queue.
In both the non-Enhanced and Enhanced BC modes, the PCI Enhanced Mini-
ACE BC implements all MIL-STD-1553B message formats. Message format is
programmable on a message-by-message basis by means the BC Control Word
and the T/R* bit of the Command Word for the respective message. The BC
Control Word allows 1553 message format, 1553A/B type RT, bus channel, self-
test, and Status Word masking to be specified on an individual message basis.
In addition, automatic retries and/or interrupt requests may be enabled or
disabled for individual messages. The BC performs all error checking required
by MIL-STD-1553B. This includes validation of response time, sync type and
sync encoding, Manchester II encoding, parity, bit count, word count, Status
Word RT Address field, and various RT-to-RT transfer errors.
The PCI
Enhanced Mini-ACE BC response timeout value is programmable with choices of
18, 22, 50, and 130
s. The longer response timeout values allow for operation
over long buses and/or use of the repeaters.
In its non-Enhanced mode, the PCI Enhanced Mini-ACE may be programmed to
process BC frames of up to 512 messages with no processor intervention. In the
Enhanced BC mode, there is no explicit limit to the number of messages that
may be processed in a frame. In both modes, it is possible to program for either
single frame or frame auto-repeat operation. In the auto-repeat mode, the frame
repetition rate may be controlled either internally, using a programmable BC
frame timer, or from an external trigger input.
Enhanced BC Mode: Message Sequence Control.
One of the major new
architectural features of the PCI Enhanced Mini-ACE series is its advanced
capability for BC message sequence control. The PCI Enhanced Mini-ACE
supports highly autonomous BC operation, which greatly offloads the operation of
the host processor.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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| BU-62864 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MIL-STD-1553 Components |PCI-Enhanced Mini-ACE? |
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