Electronic calculator or digital processor chip having test mode

Details Electronic calculator or digital processor chip having test mode Electronic calculator or digital processor chip having test mode

1974-11-19

1977-05-17

Malzahn, David H.

Registers

Transfer mechanism

Traveling pawl

G11C 2900

Patent

active

040243869

ABSTRACT:
An MOS/LSI semiconductor chip for providing the functions of an electronic calculator or digital processor includes a data memory, an arithmetic unit for executing operations on data, and a control arrangement for defining the functioning of the machine including a ROM for storing a large number of instruction words, and control decoders for receiving instruction words from the ROM and producing various commands for the control arrangement. Separate X and Y address registers are provided for selecting the location in the ROM for the next instruction. Input and output terminals are provided, as for keyboard input, and display output. A test mode of operation is provided for quality control upon completion of manufacture of the chip. The test mode allows the entire ROM to be tested by reading in addresses to the address registers from external, loading the resulting instruction word into the Y address register, and reading out the instruction word from the Y register, all under control of simulated keyboard inputs using the standard terminals. Further, normal operating sequences can be initiated by simulating a branch to the desired location and allowing the system to continue under its own control for a selected operation.

REFERENCES:
patent: 3798612 (1974-03-01), Struger et al.
patent: 3838264 (1974-09-01), Maker
patent: 3869603 (1975-03-01), Auspurg et al.

Affiliated with

Also associated with

Rating

Electronic calculator or digital processor chip having test mode does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic calculator or digital processor chip having test mode, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic calculator or digital processor chip having test mode will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1836258