
8
Data Device Corporation
www.ddc-web.com
BU-61582
G-08/02-250
END OF MESSAGE
0(LSB)
BC STATUS SET/RT MODE CODE/MT PATTERN TRIGGER
1
FORMAT ERROR
2
BC END OF FRAME
3
BC/RT SELECTED MESSAGE
4
RT CIRCULAR BUFFER ROLLOVER
5
TIME TAG ROLLOVER
6
RT ADDRESS PARITY ERROR
7
BC RETRY
8
HS FAIL
9
MT DATA STACK ROLLOVER
10
MT COMMAND STACK ROLLOVER
11
BC/RT COMMAND STACK ROLLOVER
12
BC/RT TRANSMITTER TIMEOUT
13
RAM PARITY ERROR
14
RESERVED
15(MSB)
DESCRIPTION
BIT
TABLE 5. INTERRUPT MASK REGISTER
(READ/WRITE 00H)
Configuration Registers #3, #4, and #5:
Used to enable many of the BU-61582’s advanced features.
These include all the enhanced mode features; that is, all the
functionality beyond that of the previous generation product, the
BUS-61559 Advanced Integrated Mux Hybrid with Enhanced RT
Features (AIM-HY’er). For BC mode, the enhanced mode fea-
tures include the expanded BC Control Word and BC Block
Status Word, additional Stop-On-Error and Stop-On-Status Set
functions, frame auto-repeat, programmable intermessage gap
times, automatic retries, expanded Status Word Masking, and
the capability to generate interrupts following the completion of
any selected message. For RT mode, the enhanced mode fea-
tures include the expanded RT Block Status Word, the combined
RT/Selective Message Monitor mode, internal wrapping of the
RTFAIL output signal (from the J-Rad chip) to the RTFLAG RT
Status Word bit, the double buffering scheme for individual
receive (broadcast) subaddresses, and the alternate (fully soft-
ware programmable) RT Status Word. For MT mode, use of the
enhanced mode enables use of the Selective Message Monitor,
the combined RT/Selective Monitor modes, and the monitor trig-
gering capability.
Data Stack Address Register:
used for storing message words (second Command Words, Data
Words, RT Status Words) in the Selective Word Monitor mode.
Frame Time Remaining Register:
Provides a read only indication of the time remaining in the cur-
rent BC frame. The resolution of this register is 100, 128 or 255
s/LSB.
Message Time Remaining Register:
Provides a read only indication of the time remaining before the
start of the next message in a BC frame. The resolution of this
register is 1 s/LSB.
BC Frame/RT Last Command/MT Trigger Word
Register:
In BC mode, it programs the BC frame time, for use in the frame
auto-repeat mode. The resolution of this register is 100 s/LSB,
with a range of 6.55 seconds; in RT mode, this register stores the
current (or most previous) 1553 Command Word processed by
the SP’ACE RT; in the Word Monitor mode, this register specifies
a 16-bit Trigger (Command) Word. The Trigger Word may be
used to start or stop the monitor, or to generate interrupts.
Status Word Register and BIT Word Registers:
Provide read-only indications of the BU-61582’s RT Status and
BIT Words.
Test Mode Registers 0-7:
These registers may be used to facilitate production or mainte-
nance testing of the SP’ACE and systems incorporating the
SP’ACE hybrid.