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| 型號： | BU-61843G3-520Q |
| 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, 2.54 MM HEIGHT, CERAMIC, QFP-72 |
| 文件頁數(shù)： | 8/60頁 |
| 文件大?。?/td> | 457K |
| 代理商： | BU-61843G3-520Q |
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16
Data Device Corporation
www.ddc-web.com
BU-6174X/6184X/6186X
F-10/02-300
BUS CONTROLLER (BC) ARCHITECTURE
The BC functionality for the Enhanced Mini-ACE/-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 mes-
sages 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
Enhanced Mini-ACE/-ACE BC implements all MIL-STD-1553B
message formats. Message format is programmable on a mes-
sage-by-message basis by means of 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 Enhanced Mini-
ACE/-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 the use of
repeaters.
In its non-Enhanced Mode, the Enhanced Mini-ACE/-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 Enhanced
Mini-ACE/-ACE series is its advanced capability for BC mes-
sage sequence control. The Enhanced Mini-ACE/-ACE sup-
ports highly autonomous BC operation, which greatly offloads
the operation of the host processor.
The operation of the Enhanced Mini-ACE/-ACE's message
sequence control engine is illustrated in FIGURE 2. The BC mes-
sage sequence control involves an instruction list pointer register;
an instruction list which contains multiple 2-word entries; a mes-
sage control/status stack, which contains multiple 8-word or 10-
word descriptors; and data blocks for individual messages.
The initial value of the instruction list pointer register is initialized
by the host processor (via Register 0D), and is incremented by
the BC message sequence processor (host readable via
Register 03). During operation, the message sequence control
processor fetches the operation referenced by the instruction list
pointer register from the instruction list.
Note that the pointer parameter referencing the first word of a
message's control/status block (the BC Control Word) must con-
FIGURE 2. BC MESSAGE SEQUENCE CONTROL
OP CODE
DATA BLOCK
MESSAGE
CONTROL/STATUS
PARAMETER
(POINTER)
BLOCK
BC INSTRUCTION
LIST
BC INSTRUCTION
LIST POINTER REGISTER
BC CONTROL
WORD
COMMAND WORD
(Rx Command for
RT-to-RT transfer)
DATA BLOCK POINTER
TIME-TO-NEXT MESSAGE
TIME TAG WORD
BLOCK STATUS WORD
LOOPBACK WORD
RT STATUS WORD
2nd (Tx) COMMAND WORD
(for RT-to-RT transfer)
2nd RT STATUS WORD
(for RT-to-RT transfer)
INITIALITIZE BY REGISTER
0D (RD/WR); READ CURRENT
VALUE VIA REGISTER 03
(RD ONLY)
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