參數(shù)資料
型號(hào)： BU-6486NEW
英文描述： MIL-STD-1553 Components |Mini-ACE? Mark3
中文描述： 符合MIL - STD - 1553模塊|迷你ACE論壇？ Mark3
文件頁(yè)數(shù)： 31/60頁(yè)
文件大小： 410K
代理商： BU-6486NEW
31
Data Device Corporation
www.ddc-web.com
BU-64743/64843/64863
C-03/03-300
RT COMMAND ILLEGALIZATION
The Mini-ACE Mark3 provides an internal mechanism for RT
Command Word illegalizing. By means of a 256-word area in
shared RAM, the host processor may designate that any mes-
sage be illegalized, based on the command word T/R bit, sub-
address, and word count/mode code fields.The Mini-ACE Mark3
illegalization scheme provides the maximum in flexibility, allow-
ing any subset of the 4096 possible combinations of broad-
cast/own address, T/R bit, subaddress, and word count/mode
code to be illegalized.
The address map of the Mini-ACE Mark3's illegalizing table is
illustrated in TABLE 41.
BUSY BIT
The Mini-ACE Mark3 RT provides two different methods for set-
ting 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 Mini-ACE
Mark3 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 Mini-ACE Mark3
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 subad-
dress.
If the busy bit is set for a transmit command, the Mini-ACE
Mark3 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 Mini-ACE Mark3 offers several different options for desig-
nating 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 Mini-ACE Mark3's internal RT Built-in-Test
(BIT) Word is indicated in TABLE 42.
COMMAND WORD CONTENTS ERROR
0 (LSB)
RT-to-RT 2ND COMMAND WORD ERROR
1
RT-to-RT NO RESPONSE ERROR
2
TRANSMITTER SHUTDOWN B
TRANSMITTER SHUTDOWN A
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
10
HANDSHAKE FAILURE
12
11
LOOP TEST FAILURE A
13
LOOP TEST FAILURE B
14
TRANSMITTER TIMEOUT
15(MSB)
DESCRIPTION
BIT
TABLE 42. RT BIT WORD
RT AUTO-BOOT OPTION
If utilized, the RT pin-programmable auto-boot option allows the
Mini-ACE Mark3 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 Mini-ACE Mark3 with 4K words of RAM.
OTHER RT FEATURES
The Mini-ACE Mark3 includes options for the Terminal flag sta-
tus word bit to be set either under software control and/or auto-
matically following a failure of the loopback self-test. Other soft-
ware programmable RT options include software programmable
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.
MONITOR ARCHITECTURE
The Mini-ACE Mark3 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.
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