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參數(shù)資料
| 型號： | BU-61745F3-262Q |
| 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 X 1 INCH, 0.155 INCH HEIGHT, CERAMIC, FP-72 |
| 文件頁數(shù)： | 24/60頁 |
| 文件大小： | 700K |
| 代理商： | BU-61745F3-262Q |
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30
Data Device Corporation
www.ddc-web.com
BU-6174X/6184X/6186X
Rev. C
MONITOR ARCHITECTURE
The Enhanced Mini-ACE includes three monitor modes:
(1) A Word Monitor mode.
(2) A selective message monitor mode.
(3) A combined RT/message monitor mode.
For new applications, it is recommended that the selective mes-
sage monitor mode be used, rather than the word monitor mode.
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.
WORD MONITOR MODE
In the Word Monitor Terminal mode, the Enhanced Mini-ACE
monitors both 1553 buses. After the software initialization and
Monitor Start sequences, the Enhanced Mini-ACE stores all
Command, Status, and Data Words received from both buses.
For each word received from either bus, a pair of words is stored
to the Enhanced Mini-ACE's shared RAM. The first word is the
word received from the 1553 bus. The second word is the
Monitor Identification (ID), or "Tag" word. The ID word contains
information relating to bus channel, word validity, and inter-word
time gaps. The data and ID words are stored in a circular buffer
in the shared RAM address space.
WORD MONITOR MEMORY MAP
A typical word monitor memory map is illustrated in TABLE 43.
TABLE 43 assumes a 64K address space for the Enhanced Mini-
ACE's monitor. The Active Area Stack pointer provides the
address where the first monitored word is stored. In the example,
it is assumed that the Active Area Stack Pointer for Area A (loca-
tion 0100) is initialized to 0000. The first received data word is
stored in location 0000, the ID word for the first word is stored in
location 0001, etc.
BUSY BIT
The Enhanced Mini-ACE RT provides two different methods for
setting the Busy status word bit: (1) globally, by means of
Configuration Register #1; or (2) on a T/R-bit/subaddress basis,
by means of a RAM lookup table. If the host CPU asserts the
BUSY bit to logic “0“ in Configuration Register #1, the Enhanced
Mini-ACE RT will respond to all non-broadcast commands with
the Busy bit set in its RT Status Word.
Alternatively, there is a Busy lookup table in the Enhanced Mini-
ACE shared RAM. By means of this table, it is possible for the
host processor to set the busy bit for any selectable subset of the
128 combinations of broadcast/own address, T/R bit, and sub-
address.
If the busy bit is set for a transmit command, the Enhanced Mini-
ACE RT will respond with the busy bit set in the status word, but
will not transmit any data words. If the busy bit is set for a receive
command, the RT will also respond with the busy status bit set.
There are two programmable options regarding the reception of
data words for a non-mode code receive command for which the
RT is busy: (1) to transfer the received data words to shared
RAM; or (2) to not transfer the data words to shared RAM.
RT ADDRESS
The Enhanced Mini-ACE offers several different options for des-
ignating the Remote Terminal address. These include the follow-
ing: (1) hardwired, by means of the 5 RT ADDRESS inputs, and
the RT ADDRESS PARITY input; (2) by means of the RT
ADDRESS (and PARITY) inputs, but latched via hardware, on
the rising edge of the RT_AD_LAT input signal; (3)
input by
means of the RT ADDRESS (and PARITY) inputs, but latched via
host software; and (4) software programmable, by means of an
internal register. In all four configurations, the RT address is
readable by the host processor.
RT BUILT-IN-TEST (BIT) WORD
The bit map for the Enhanced Mini-ACE's internal RT Built-in-
Test (BIT) Word is indicated in TABLE 42.
RT AUTO-BOOT OPTION
If utilized, the RT pin-programmable auto-boot option allows the
Enhanced Mini-ACE RT to automatically initialize as an active
remote terminal with the Busy status word bit set to logic "1"
immediately following power turn-on. This is a useful feature for
MIL-STD-1760 applications, in which the RT is required to be
responding within 150 ms after power-up. This feature is avail-
able for versions of the Enhanced Mini-ACE with 4K words of
RAM.
OTHER RT FEATURES
The Enhanced Mini-ACE includes options for the Terminal flag
status word bit to be set either under software control and/or
automatically following a failure of the loopback self-test. Other
software programmable RT options include software program-
mable RT status and RT BIT words, automatic clearing of the
Service Request bit following receipt of a Transmit vector word
mode command, options regarding Data Word transfers for the
Busy and Message error (illegal) Status word bits, and options
for the handling of 1553A and reserved mode codes.
COMMAND WORD CONTENTS ERROR
0(LSB)
RT-to-RT 2ND COMMAND WORD ERROR
1
RT-to-RT NO RESPONSE ERROR
2
TRANSMITTER SHUTDOWN B
RT-to-RT GAP / SYNC ADDRESS ERROR
3
PARITY / MANCHESTER ERROR RECEIVED
4
INCORRECT SYNC RECEIVED
5
LOW WORD COUNT
6
HIGH WORD COUNT
7
BIT TEST FAILURE
8
TERMINAL FLAG INHIBITED
9
TRANSMITTER SHUTDOWN A
10
HANDSHAKE FAILURE
12
LOOP TEST FAILURE A
13
LOOP TEST FAILURE B
14
TRANSMITTER TIMEOUT
15(MSB)
DESCRIPTION
BIT
11
TABLE 42. RT BIT WORD
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