Cam cell for overwriting comparison data during mask operation
AssigneeSocionext Inc.
InventorTsuyoshi KOIKE
Life of this patent
Estimating the term…
Abstract
A comparison function-equipped memory element includes: a memory circuit that stores comparison object data; a comparison circuit that compares the comparison object data held in the memory circuit with comparison data and outputs the comparison result; and a write circuit that writes the comparison object data into the memory circuit under control of a write control signal during write operation, and overwrites the comparison data into the memory circuit when a mask control signal indicates mask operation during comparison operation.
Claims16
A comparison function-equipped memory element that compares stored comparison object data with comparison data, the element comprising:
- a memory circuit that stores the comparison object data;
- a write circuit that writes the comparison object data into the memory circuit under control of a write control signal during write operation;
- and
- a comparison circuit that compares the comparison object data held in the memory circuit with the comparison data and outputs a comparison result,
- wherein
- during comparison operation by the comparison circuit, the write circuit overwrites the comparison data into the memory circuit when a mask control signal indicates mask operation, and does not perform the overwrite of the comparison data into the memory circuit when the mask control signal indicates non-mask operation.
A one-bit comparator that compares comparison object data with comparison data, comprising:
- a selection circuit that selects and outputs either the comparison object data or the comparison data under control of a mask control signal;
- and
- a comparison circuit that compares an output signal of the selection circuit with the comparison data and outputs a comparison result,
- wherein
- the selection circuit selects and outputs the comparison data when the mask control signal indicates mask operation, and selects and outputs the comparison object data when the mask control signal indicates non-mask operation.
Dependencies are inferred from the claim text.