Method and system for tracking the state of each one of multiple JTAG chains used in testing the logic of intergrated circuits
US5598421A · kind A · utility
48Cited by
8References
6Claims
0Family size
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Key dates
| Filing date | Feb 17, 1995 |
| Grant date | Jan 28, 1997 |
| Priority date | — |
| Expiry date | Feb 17, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/318536
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The logic circuitry of an IC chip is connected to JTAG register chains which hold state information on each portion of the logic circuitry therein. A JTAG Tracker Module is connected to the controls of each of the JTAG register chains enabling a programmer-operator to read the present state of each JTAG register chain and enabling a readout of the logic circuits condition in a single clock period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.