GPIB system with improved parallel poll response detection

Details GPIB system with improved parallel poll response detection GPIB system with improved parallel poll response detection

1995-06-07

1997-07-15

Harvey, Jack B.

395866, 395727, G06F 1322

Patent

active

056491239

ABSTRACT:
A GPIB system including a parallel poll detection system for capturing signals of a GPIB in response to a parallel poll command. Capture logic includes sampling circuitry for continually sampling the GPIB signals, where the capture logic further stores the samples into a buffer upon desired conditions. A parallel poll detection circuit detects a parallel poll command asserted and subsequently negated on the GPIB, and correspondingly causes GPIB samples to be captured on both of these events. Also, a timer circuit causes the GPIB signals to be captured a predeteremined time period after the assertion of each parallel poll command. In the preferred embodiment, transition detect logic further causes GPIB samples to be captured if any transition of GPIB data signals occur while the parallel poll command is asserted on the GPIB.

REFERENCES:
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patent: 5287528 (1994-02-01), Canik et al.
1994 IEEE 488 and VXIbus Control, Data Acquisition, and Analysis, National Instruments Corporation, "GPIB Monitor/Analyzer, GPIB-410", 2-126 - 1-129, High Performance Single-Chip gPIB Talker/Listener ASIC, TNT4882, pp. 2-135 - 2-136 1994.
"Catching the Right Bus III: IEEE-488.1", by Ricahard Newrock and James R. Matey, p. 5 May 1994.
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National Instruments Corporation Catalog, "TNT4882, Single-Chip IEEE 488.2 Talker/Listener" ASIC, Jun. 10, 1994, pp. 1-24.
1994 IEEE 488 and VXIbus Control, Data Acquistion, and Analysis, National Instruments Corporation, "GPIB Monitor/Analyzer, GPIB-410", 2-126 - 2-129, High-Performance Single-Chip GPIB Talker Listener ASIC, TNT4882 pp. 2-135 - 2-136.
IOtech Smart Approach to Instrumentation 1993 Catalog, National Instruments Corporation, "Analyzer 488, IEEE Analyzer", pp. 51-54 and pp. 37-41.
1993-1994 ICS Electronics Corporation Catalog, "IEEE 488/GPIB Bus Analyzer With Multiline Display", pp. 7-1 - 7-6, 4811 Bus Analyser With Multiline Display, 6 pages (not numbered).
GPIB-410 User Manual, Mar. 1994 Edition, Part No. 320053-01, National Instruments Corporation, pp. i-xv, 1-1 - 4-33, A-1 - I-1, and Index 1 - Index 12.

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