Modular organized storage tester
AssigneeInternational Business Machines Corporation
InventorsRichard Bogholtz, Jr., Louis J. Bosch
Life of this patent
Estimating the term…
Abstract
A tester of circuit devices is disclosed which uses commercially available component parts but is capable of high performance testing of hierarchical memory cards requiring data pulses of variable pulse widths at high repetition rates. The tester includes two memories connected to respective shift registers which in turn, feed a multiplexer. The memories handle test timing patterns for respective halves of the basic clock test cycle and are interleaved in operation along with the shift registers. Two opposite-phased outputs of the multiplexer are applied through respective programmable delay networks and pulse generators to the set and reset inputs of a trigger circuit. The trigger circuit provides test data to a dedicated input pin of the device under test.
Claims8
Apparatus comprising;
- first and second memory means for addressably storing and supplying stored test data signals,
- first and second shift registers connected to receive said stored data signals from said first and second memory means, respectively,
- said registers serially shifting said received stored data signals onto first and second output lines in response to first and second clock pulses, respectively,
- said second clock pulses being delayed with respect to said first clock pulses,
- means for applying address signals to said first and second memory means and for applying command signals to said first and second shift registers, and
- a multiplexer connected to receive said data signals on said first and second output lines and operative to provide recurrent groups of interleaved data signals, each group comprising a serial succession of data signals from said first register followed by data signals from said second register in response to third clock pulses,
- said third clock pulses occurring between said first and second clock pulses.
Dependencies are inferred from the claim text.