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參數(shù)資料
| 型號： | BU-65527C3-300 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 3 CHANNEL(S), MIL-STD-1553 CONTROLLER, XMA |
| 文件頁數(shù)： | 11/32頁 |
| 文件大?。?/td> | 2094K |
| 代理商： | BU-65527C3-300 |
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19
Data Device Corporation
www.ddc-web.com
BU-65528 and BU-65527
F1 web-10/02-0
messages with WC/MC fields between 16 and 31 may be ille-
galized by setting the corresponding data bits for the respective
odd-numbered address locations in the illegalization table.
The following should be noted with regards to command illegal-
ization:
(1)To illegalize a particular word count for a given broadcast/own
address-
subaddress, the appropriate bit position in the
respective illegalization word should be set to logic 1. A bit value
of logic 0 designates the respective Command Word as a legal
command. The BU-65528/27 will respond to an illegalized non-
broadcast command with the Message Error bit set in its RT
Status Word.
(2)For subaddresses 00001 through 11110, the “WC/MC” field
specifies the Word Count field of the respective Command Word.
For subaddresses 00000 and 11111, the “WC/MC” field specifies
the Mode Code field of the respective Command Word.
(3)Since non-mode code broadcast transmit messages are not
defined by MIL-STD-1553B, the sixty (60) words in the illegal-
ization RAM, addresses 0342 through 037D, corresponding to
these commands do not need to be initialized. The BU-65528/27
will not respond to a non-mode code broadcast transmit com-
mand, but will automatically set the Message Error bit in its inter-
nal 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
BU-65528/27 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-65528/27 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-65528/27 address
space, it is possible to set the Busy bit based on command
broadcast/own address,
bit, and subaddress. Another pro-
grammable 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-65528/27 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 automat-
ically 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.
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MONITOR (MT) ARCHITECTURE
The BU-65528/27 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,
bit, and Subaddress, the Message Monitor eliminates the
need to determine the start and end of messages by software.
The development 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-65528/27 monitors both 1553
buses. After initializing the Word Monitor and putting it on-line the
BU-65528/27 stores all Command, Status, and Data Words
received from both buses. For each word received from either
bus, the BU-65528/27 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
contains information relating to bus channel, sync type, word
validity, and inter-word time gaps. The BU-65528/27 stores data
and ID words in a circular buffer in the shared RAM address
space. TABLE 31 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-65528/27 stores the value
of the 16-bit Trigger Word in the MT Trigger Word Register. The
contents of this register represent the value of the Trigger
Command Word. The BU-65528/27 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-65528/27 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,
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-
65528/27 RAM: a Command Stack and a Data Stack.
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