Processor with in-system emulation circuitry which uses the same

Details Processor with in-system emulation circuitry which uses the same Processor with in-system emulation circuitry which uses the same

1994-10-27

1996-02-20

An, Meng-Ai

Boots, shoes, and leggings

3642211, 3642216, 3642323, 3642674, 364DIG1, G06F 1130, G06F 1300

Patent

active

054937230

ABSTRACT:
A processor emulation system for testing processor operation. First and second identical microprocessors are used together with a target system which includes the main memory. One microprocessor performs an in-system emulation (ISE) function by operating in lock step with the second processor which functions as the master processor. A mode control signal is used to switch the microprocessors between a normal operating mode and an ISE mode. Normal microprocessor signals are outputted on predetermined terminals for the processor in the normal operating mode and the parallel contents of the processor program counter are outputted on the same predetermined terminals when the microprocessor is in the ISE mode. The master processor provides output signals to the target system, with the ISE processor and the master processor both receiving signals from the target system. Operation of the master processor can be ascertained by monitoring the program counter output of the ISE processor.

REFERENCES:
patent: 4144562 (1979-03-01), Cooper
patent: 4267581 (1981-06-01), Kobayashi et al.
patent: 4308581 (1981-12-01), Raghunathan
patent: 4443864 (1984-04-01), McElroy
patent: 4460972 (1984-07-01), Homan et al.
patent: 4470113 (1984-09-01), Oura
patent: 4633437 (1986-12-01), Mothersole et al.
patent: 4670838 (1987-06-01), Kawata
patent: 4674089 (1987-06-01), Poret et al.
patent: 4727514 (1988-02-01), Bhuva et al.
patent: 4780819 (1988-10-01), Kashiwagi
patent: 4813009 (1989-03-01), Tallman
patent: 4823307 (1989-04-01), Melgara et al.
patent: 4833620 (1989-05-01), Takahashi
patent: 4841434 (1989-06-01), Mathewes, Jr. et al.
patent: 4872167 (1989-10-01), Maezawa et al.
patent: 4881228 (1989-11-01), Shouda
patent: 4924382 (1990-05-01), Shouda
patent: 4969087 (1990-11-01), Tanagawa et al.
patent: 5021948 (1991-07-01), Nakayama et al.
patent: 5021996 (1991-06-01), Watanabe
patent: 5088027 (1992-12-01), Tanagawa et al.
patent: 5101498 (1992-03-01), Ehlig et al.
patent: 5132971 (1992-07-01), Oguma et al.
patent: 5151881 (1992-09-01), Kajigaya et al.
patent: 5262990 (1993-11-01), Mills et al.
patent: 5289587 (1994-02-01), Razban

Affiliated with

Also associated with

Rating

Processor with in-system emulation circuitry which uses the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Processor with in-system emulation circuitry which uses the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Processor with in-system emulation circuitry which uses the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1363579