Write protection circuit for use with an electrically alterable

Details Write protection circuit for use with an electrically alterable Write protection circuit for use with an electrically alterable

1991-05-15

1993-07-06

LaRoche, Eugene R.

Static information storage and retrieval

Read/write circuit

365195, 365228, G11C 700

Patent

active

052260062

ABSTRACT:
In the present invention a write protection circuit capable of being used in a memory card is disclosed. The write protection circuit receives an externally supplied write protect signal and generates a protection signal for use with an associated electrically alterable non-volatile memory. The write protection circuit has two non-volatile storage registers, each storing a single bit. Logic means receives a bit from a first register and passes the externally supplied write protect signal as the internally generated protection signal when the bit is in a "1" state. When the bit is in another state, the signal from the second register is used as the protection signal.

REFERENCES:
patent: 4580246 (1986-04-01), Sibigtroth
patent: 4665506 (1987-05-01), Cline et al.
patent: 4796235 (1989-01-01), Sparks et al.
patent: 5016219 (1991-05-01), Nolan et al.
patent: 5047982 (1991-09-01), Smith et al.
patent: 5119336 (1992-06-01), Itoh

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