04701920 is referenced by 73 patents and cites 5 patents.

An improved built-in self-test system fabricated on an LSI circuit chip for performing dynamic tests of main logic function operation. The built-in self-test system includes a control register comprising a series of static flip-flops connected for serial test data transfer and for producing test system control signals. An input shift register connected for serial test data transfer with the control register and for parallel test data transfer with the main logic function is formed by a series arrangement of static flip-flops. An output register connected for serial test data transfer with the input register, and for parallel test data transfer with the main logic function, is formed by a series arrangement of static flip-flops. A test clock enable signal is latched by a test clock enable latch, and gated with a system clock signal to produce input and output register clock signals. A test strobe signal is latched by a test strobe latch and strobed by a flip-flop for use as a control register enable signal. The latched test strobe signal and the latched test clock enable signal are gated with the system clock signal for use as a control register clock signal. A test data output multiplexer decodes a test data select signal produced by the control register and supplies test data represented thereby to a test data output pin.

Title
Built-in self-test system for VLSI circuit chips
Application Number
6/796598
Publication Number
4701920
Application Date
November 8, 1985
Publication Date
October 20, 1987
Inventor
Randall E Bach
Stillwater
MN, US
David R Resnick
Shoreview
MN, US
Agent
Kinney & Lange
Assignee
ETA Systems
MN, US
IPC
G01R 31/28
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