Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital logic testing
Reexamination Certificate
2011-01-04
2011-01-04
Britt, Cynthia (Department: 2117)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital logic testing
C714S741000, C714S728000
Reexamination Certificate
active
07865794
ABSTRACT:
A novel decompressor/PRPG on a microchip performs both pseudo-random test pattern generation and decompression of deterministic test patterns for a circuit-under-test on the chip. The decompressor/PRPG has two phases of operation. In a pseudo-random phase, the decompressor/PRPG generates pseudo-random test patterns that are applied to scan chains within the circuit-under test. In a deterministic phase, compressed deterministic test patterns from an external tester are applied to the decompressor/PRPG. The patterns are decompressed as they are clocked through the decompressor/PRPG into the scan chains. The decompressor/PRPG thus provides much better fault coverage than a simple PRPG, but without the cost of a complete set of fully-specified deterministic test patterns.
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Kassab Mark
Mukherjee Nilanjan
Rajski Janusz
Tyszer Jerzy
Britt Cynthia
Klarquist & Sparkman, LLP
Mentor Graphics Corporation
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