Communications: electrical – Systems – Selsyn type
Patent
1986-05-15
1988-09-27
Crosland, Donnie L.
Communications: electrical
Systems
Selsyn type
340310R, 340636, 340657, 340660, 34082544, 364707, 368203, 368204, H04M 1104, G08B 2100
Patent
active
047744936
ABSTRACT:
An apparatus and method are disclosed for transferring information into an integrated circuit over the power supply pins of the integrated circuit. The apparatus and method are used to load a test program into memory of the computer system and the system is caused to execute the test program to verify proper operation of the computer system. The apparatus and method are implemented by converting the information to be loaded into a serial bit stream, using the serial bit stream to modulate the power supply voltage of the computer system. Inside the computer system, the low power supply levels are sensed by a low power supply detection unit an fed to a serial-to-parallel converter where it is converted back into the original information.
REFERENCES:
patent: 4290109 (1981-09-01), Taniguchi et al.
patent: 4438431 (1984-03-01), Toyomura
patent: 4466074 (1984-08-01), Jindrick et al.
patent: 4553081 (1985-11-01), Koenck
"Dynamic Digital Board Testing", Hewlett-Packard Application Note AN308-1, Nov. 1980.
Rhodes-Burke, "Retrofit for Signature Analysis Simplified", Hewlett-Packard Journal, p. 9, Jan. 1982.
Crosland Donnie L.
Hewlett--Packard Company
Redding, Jr. Bloor
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