In-circuit emulation of a microprocessor mounted on a circuit bo

Details In-circuit emulation of a microprocessor mounted on a circuit bo In-circuit emulation of a microprocessor mounted on a circuit bo

1990-10-03

1993-07-06

Beausoliel, Jr., Robert W.

Excavating

3642323, 36426791, 3642328, G06F 1100

Patent

active

052260470

ABSTRACT:
In-circuit emulation of a processor that is mounted on a circuit board. The processor (20) is provided with isolation circuitry wherein a particular input signal regime causes all processor outputs to be disabled. The emulator cable (60) terminates in a set of contacts (62a-d, 75) configured to engage the processor pins (12a-d, 25). In the special case of a surface-mount processor, the contacts are mounted to fit over and around the processor and are spring-loaded. Provision is made via at least one of the probe contacts (75) to establish the specific input signal regime at the appropriate processor pin(s) (25) in order to isolate the processor pins from any processor output signals. This prevents any processor output signals from reaching the emulator or the rest of the board logic, thereby allowing the emulator to operate.

REFERENCES:
patent: 4901259 (1990-02-01), Watkins
patent: 4939637 (1990-07-01), Pawloski
patent: 4964074 (1990-10-01), Suzuki et al.
"Emulators for Microprocessor System Development" by Donnelly et al. 1980 Hewlett Packard Journal pp. 13-20.
"Microprocessor-Based Design" by M. Slater pp. 52-54, 1987.
"ICE-286 In-Circuit Emulator"; Intel; pp. 48-49.
Microcosm, Inc.; "Chapter One--Introduction"; ICE-386 User Manual, pp. 51-53.
3M Electronic Specialty Products; "Surface Mount Test Clip"; p. 258.

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