Diagnostic circiut for digital systems

Details Diagnostic circiut for digital systems Diagnostic circiut for digital systems

1988-04-14

1990-06-19

Fleming, Michael R.

Excavating

371 251, G06F 1100

Patent

active

049359290

ABSTRACT:
In a circuit for selectively communicating data into and out of a signal path, typically used for diagnosing a data processing unit, a shadow register is used for receiving data from and transferring data to an external source. The shadow register is physically insulated from the signal path by a first state register and a second state register, the first state register transferring data from the signal path to the shadow register, the second state register transferring data between the shadow register and the signal path. Path switching is achieved by a selector connected to the respective outputs of the first and second state registers and responsive to a control signal for releasing output signals from only one of these registers.

REFERENCES:
patent: 4476431 (1984-10-01), Blum
patent: 4580137 (1986-04-01), Fiedler
patent: 4669061 (1987-05-01), Bhavsar
patent: 4697267 (1987-09-01), Wakai
patent: 4698588 (1987-10-01), Hwang

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