Excavating
Patent
1993-05-28
1999-02-23
DeCady, Albert
Excavating
G06F 1100
Patent
active
058751947
ABSTRACT:
Objective: To make it possible to easily increase the integration level and increase the memory capacity of a semiconductor memory device by using a single redundant decoder to completely repair defects at one or two neighboring addresses. Structure: The redundant circuit of the present invention comprises the following: an address code conversion circuit (2) which converts address signals, inputted in binary code, into gray code; a decoder (3) which outputs a coincidence signal after determining whether the addresses set in advance coincide or do not coincide with the gray code outputted from the aforementioned address code conversion circuit; a first driver (DR2) which drives a first redundant line which is connected to a redundant memory cell designed to supplement memory cells in which defects have occurred; and a second driver (DR1) which drives a second redundant line. Either the first driver or the second driver (DR1 or DR2), which respectively drive the first and second redundant lines, is selected according to the coincidence signal outputted from the aforementioned decoder (3), the least significant bit in the aforementioned binary code address signal, and the corresponding complemented signal. Defects at one or two neighboring addresses are thus repaired using a single decoder.
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Burton Dana L.
De'cady Albert
Donaldson Richard L.
Kempler William B.
Texas Instruments Incorporated
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