In-circuit emulator

Details In-circuit emulator In-circuit emulator

1985-04-16

1987-06-16

Fleming, Michael R.

Excavating

371 16, 364200, 324 73R, G01R 3128, G06F 1130

Patent

active

046740899

ABSTRACT:
A circuit is disclosed which is implemented on the same silicon chip as a microprocessor to be utilized in a microprocessor system such as a microcontroller, which circuit allows a user to perform in-circuit emulation ("ICE") for the purpose of debugging the microprocessor system. The ICE circuitry comprises (i) capture logic which monitors the contents of the program address register and the internal data bus and various control lines of the processor; (ii) trace circuitry comprising a FIFO buffer which puts data from the capture logic to the output pins of the chip; and (iii) a content addressable memory and a software programmable logic array with emulation counters which together function as a finite state machine which performs the desired predetermined testing of the system.

REFERENCES:
patent: 3937938 (1976-02-01), Matthews
patent: 4192451 (1980-03-01), Swerling
patent: 4403287 (1983-09-01), Blahut
patent: 4433413 (1984-02-01), Fasang
patent: 4455654 (1984-06-01), Bhaskar
patent: 4571677 (1986-02-01), Hirayama
patent: 4583179 (1986-04-01), Horii
patent: 4590550 (1986-05-01), Eilert
patent: 4622669 (1986-11-01), Pri-Tal

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