Data erase mechanism for nonvolatile memory of boot block type

Details Data erase mechanism for nonvolatile memory of boot block type Data erase mechanism for nonvolatile memory of boot block type

1997-10-17

1998-09-08

Hoang, Huan

Static information storage and retrieval

Floating gate

Particular connection

36518522, 36518529, 365236, G11C 1604

Patent

active

058055100

ABSTRACT:
The total number of bits of irregular blocks is equal to the number of bits of one equal block. The memory cells of the irregular blocks are sequentially designated using an address counter used to designate the memory cells of equal blocks. An erase operation (including pre program and erase operations) starts from "verify". Only when "verify" is NG, the pre program and erase operations are performed. A means capable of fixing a verify result VERIOK at "1" (verify OK) is arranged to always set VERIOK at "1" for a non-select block of the irregular blocks, thereby preventing execution of the pre program and erase operations for the non-select block of the irregular blocks. Accordingly, in the boot block type, the same address counter is shared by the equal and irregular blocks to reduce the circuit scale.

REFERENCES:
patent: 5297096 (1994-03-01), Terada et al.
patent: 5590074 (1996-12-01), Akaogi et al.
patent: 5592415 (1997-01-01), Kato et al.
patent: 5602789 (1997-02-01), Endoh et al.

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