Diagnostic circuitry in a data processor

Details Diagnostic circuitry in a data processor Diagnostic circuitry in a data processor

G - Physics

06

F

354/225, 354/230

G06F 11/00 (2006.01) G06F 11/07 (2006.01) G06F 11/34 (2006.01)

Patent

CA 1145852

DIAGNOSTIC CIRCUITRY IN A DATA PROCESSOR Abstract of the Disclosure Diagnostic circuitry for use with the processor of a data processing system. The diagnostic circuitry in- cludes a control register execution log for receiving con- trol store addresses from a control register associated with an "EXECUTE + 1" stage. A log pointer addresses the log when control store addresses are written into or read from the log. Test registers connected to the log and log pointer provide control store addresses and decrementing log addresses when the contents of the log are examined. One of the test registers is also used to hold a control store address for comparison with control store addresses of executing microinstructions, and when a match occurs, to generate a ???? signal.

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