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US 5,396,471 AGranted
Data protection circuit
AssigneeKabushiki Kaisha Toshiba
InventorHiroo Kitsu
Life of this patent
Estimating the term…
Abstract
A data protection circuit includes an address detection circuit latch circuit and replacing circuit. The address detection circuit,detects that an address signal for designating an address of a semiconductor memory has designated a specified address. The latch circuit latches a detection output of the address detection circuit. The replacing circuit replaces at least one bit of the address signal by readout data of the semiconductor memory in response to a latch output of the latch circuit.
Claims20
A data protection circuit comprising:
- specified address detection means for detecting that an address signal for designating an address of a semiconductor memory has designated a specified address;
- latch means for latching a detection output of said specified address detection means;
- and
- replacing means for replacing at least one bit of the address signal by data read out from said semiconductor memory in response to a latch output of said latch means.
1 more element
A semiconductor integrated circuit device comprising:
- a specified address detection circuit for detecting that an address signal for designating an address of a semiconductor memory has designated a specified address;
- a latch circuit for latching a detection output of said specified address detection circuit;
- and
- a replacing circuit for replacing at least one bit of the address signal by readout data of said semiconductor memory in response to a latch output of said latch circuit.
1 more element
Dependencies are inferred from the claim text.