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参数资料
| 型号： | BU-65170S1-820Q |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, MIL-STD-1553 CONTROLLER, CQIP70 |
| 封装： | 48.30 X 25.40 MM, 4.19 MM HEIGHT, DIP-70 |
| 文件页数： | 10/44页 |
| 文件大小： | 563K |
| 代理商： | BU-65170S1-820Q |
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Data Device Corporation
www.ddc-web.com
BU-65170/61580/61585
H1 web-09/02-0
Error bit in its internal Status Register, regardless of whether
or not corresponding bit in the illegalization RAM has been
set. If the next message is a Transmit Status or Transmit Last
Command mode code, the ACE will respond with its
Message Error bit set.
PROGRAMMABLE BUSY
As a means of providing compliance with Notice 2 of MIL-STD-
1553B, the BU-65170/61580 RT provides a software controllable
means for setting the Busy Status Word bit as a function of sub-
address. By a Busy Lookup Table in the BU-65170/61580
address space, it is possible to set the Busy bit based on com-
mand broadcast/own address, T/R bit, and subaddress. Another
programmable option, allows received Data Words to be either
stored or not stored for messages, when the Busy bit is set.
OTHER RT FUNCTIONS
The BU-65170/61580 allows the hardwired RT Address to be
read by the host processor. Also, there are options for the RT
FLAG Status Word bit to be set under software control and/or
automatically following a failure of the loopback self-test. Other
software controllable RT options include software programmable
RT Status and RT BIT words, automatic clearing of the Service
Request Status Word bit following a Transmit Vector Word mode
command, capabilities to clear and/or load the Time Tag Register
following receipt of Synchronize mode commands, options
regarding Data Word transfers for the Busy and/or Message
Error (Illegal) Status Word bits, and for handling of 1553A and
reserved mode codes.
MONITOR (MT) ARCHITECTURE
The BU-61580 provides three bus monitor (MT) modes:
(1) The “AIM-HY” (default) or “AIM-HY'er” Word Monitor mode.
(2) A Selective Message Monitor mode.
(3) A Simultaneous Remote Terminal/Selective Message Monitor
mode.
The strong recommendation for new applications is the use of
the Selective Message Monitor, rather than the Word Monitor.
Besides providing monitor filtering based on RT Address, T/R bit,
and Subaddress, the Message Monitor eliminates the need to
determine the start and end of messages by software. The devel-
opment of such software tends to be a tedious task. Moreover, at
run time, it tends to entail a high degree of CPU overhead.
WORD MONITOR
In the Word Monitor mode, the BU-61580 monitors both 1553
buses. After initializing the Word Monitor and putting it on-line the
BU-61580 stores all Command, Status, and Data Words
received from both buses. For each word received from either
bus, the BU-61580 stores a pair of words in RAM. The first word
is the 16 bits of data from the received word. The second word is
the Monitor Identification (ID), or “Tag” word. The ID Word con-
tains information relating to bus channel, sync type, word validi-
ty, and interword time gaps. The BU-61580 stores data and ID
words in a circular buffer in the shared RAM address space.
TABLE 23 shows the bit mapping for the Monitor ID word.
MONITOR TRIGGER WORD
There is a Trigger Word Register that provides additional flexibil-
ity for the Word Monitor mode. The BU-61580 stores the value of
the 16-bit Trigger Word in the MT Trigger Word Register. The con-
tents of this register represent the value of the Trigger Command
Word. The BU-61580 has programmable options to start or stop
the Word Monitor, and/or to issue an interrupt request following
receipt of the Trigger Command Word from the 1553 bus.
SELECTIVE MESSAGE MONITOR MODE
The BU-61580 Selective Message Monitor provides features to
greatly reduce the software and processing burden of the host
CPU. The Selective Message Monitor implements selective mon-
itoring of messages from a dual 1553 bus, with the monitor fil-
tering based on the RT Address, T/R bit, and Subaddress fields
of received 1553 Command Words. The Selective Message
Monitor mode greatly simplifies the host processor software by
distinguishing between Command and Status Words. The
Selective Message Monitor maintains two stacks in the BU-
61580 RAM: a Command Stack and a Data Stack.
Simultaneous RT/Message Monitor Mode
The Selective Message Monitor may function as a purely passive
monitor or may be programmed to function as a simultaneous
RT/Monitor. The RT/Monitor mode provides complete Remote
Terminal (RT) operation for the BU-61580's strapped RT address
and bus monitor capability for the other 30 nonbroadcast RT
addresses. This allows the BU-61580 to simultaneously operate
as a full function RT and “snoop” on all or a subset of the bus
activity involving the other RTs on a bus. This type of operation
is sometimes needed to implement a backup bus controller. The
combined RT/Selective Monitor maintains three stack areas in
the BU-61580 address space: an RT Command Stack, a Monitor
Command Stack, and a Monitor Data Stack. The pointers for the
various stacks have fixed locations in the BU-61580 address
space.
WC4/MC4
0(LSB)
SA0
1
SA1
2
0
SA2
3
SA3
4
SA4
5
T/R
6
BROADCAST/OWN_ADDRESS
7
1
8
1
9
0
10
0
12
0
13
0
14
0
15(MSB)
DESCRIPTION
BIT
11
TABLE 29. ILLEGALIZATION RAM ADDRESS DEFINITION
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