CIRCUIT AND METHOD FOR EXTERNALLY CONTROLLING CIRCUIT INTERNAL TIMING

PROBLEM TO BE SOLVED: To provide an external control means for accelerating efficient circuit design relating to a test mode for controlling the timing of the internal signals of an integrated circuit by leading out internal control signals from external signals and supplying the external signals to...

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Bibliographic Details
Main Authors KRSNIK BOZIDAR, KIRIHATA TOSHIAKI, WONG HING
Format Patent
LanguageEnglish
Published 11.08.1998
Edition6
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
INFORMATION STORAGE
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
STATIC STORES
TESTING
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Summary:PROBLEM TO BE SOLVED: To provide an external control means for accelerating efficient circuit design relating to a test mode for controlling the timing of the internal signals of an integrated circuit by leading out internal control signals from external signals and supplying the external signals to the external pin of the integrated circuit at the time of the test mode. SOLUTION: The control circuit is provided with two operating modes, that are a normal mode and a test mode. In the normal mode, a normal signal route is used for the timing control of the internal signals 40. The normal signal route is provided with a sub circuit 5 and the sub circuit 5 is operated by the internal signals 21 and forms output signals 31. In the test mode, a test mode signal route is used for the timing control of the internal signals 40 and the test mode signal route is provided with the sub circuit 10. By the operation of the test mode signal route, the output signals 36 of the sub circuit 10 are led out from the external signals 26. The external signals 26 are supplied to the external pin of the integrated circuit.
Bibliography:Application Number: JP19970360714