30
Data Device Corporation
www.ddc-web.com
BU-6174X/6184X/6186X
F-10/02-300
MONITOR ARCHITECTURE
The Enhanced Mini-ACE/-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/-
ACE monitors both 1553 buses. After the software initialization
and Monitor Start sequences, the Enhanced Mini-ACE/-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/-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 con-
tains 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/-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 (location 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/-ACE RT provides two different meth-
ods 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/-ACE RT will respond to all non-broadcast com-
mands with the Busy bit set in its RT Status Word.
Alternatively, there is a Busy lookup table in the Enhanced Mini-
ACE/-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
subaddress.
If the busy bit is set for a transmit command, the Enhanced Mini-
ACE/-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 sta-
tus 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/-ACE offers several different options
for designating the Remote Terminal address. These include the
following: (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/-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/-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/-ACE with 4K
words of RAM.
OTHER RT FEATURES
The Enhanced Mini-ACE/-ACE includes options for the
Terminal flag status word bit to be set either under software con-
trol and/or automatically following a failure of the loopback self-
test. Other software 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.
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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