Registers – Systems controlled by data bearing records – Time analysis
Patent
1975-12-23
1977-12-06
Dildine, Jr., R. Stephen
Registers
Systems controlled by data bearing records
Time analysis
2353041, 235312, 365201, G11C 2900, H03K 518
Patent
active
040619087
ABSTRACT:
The invention provides a compact test sequence for testing integrated memories. First, all storage positions are filled with the bit "0". Subsequently, in a given order of the addresses, the "0" bit written for each address is read; immmediately thereafter a "1" bit is written in those bit positions. The positions are again tested by reading the "1" bits. When the last address of the predetermined order is reached, the "1" is read in the same order for each address. Subsequently a "0" is written, which is finally tested by reading again. When the last address is reached, all addresses are read in the reverse order, and a "1" is written, which is tested again. When the first address is reached, all addresses are read, filled with a "0" and tested. This process may be repeated as many times as there are bits in the address. The significance of the address bits are modified to form the predetermined order, for example, by cyclic rotation. For example, in the first cycle the order may be the normal order of successive addresses, while in the second cycle first all "even" and then all "odd" addresses are treated.
REFERENCES:
patent: 3869603 (1975-03-01), Auspurg et al.
Sitler, W. R., Storage Intermittent Test, In IBM Tech. Disc. Bull., 16(2); pp. 542-543, July, 1973.
DE Jonge Jan Hendrik
Smulders Adrianus Josephus
Dildine, Jr. R. Stephen
McGlynn Daniel R.
Trifari Frank R.
U.S. Philips Corporation
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