Arithmetic circuit
AssigneeOki Electric Industry Co., Ltd.
InventorTomomi Miyano
Life of this patent
Estimating the term…
Abstract
An arithmetic circuit includes an arithmetic circuit performing an arithmetic operation of a predetermined bit width in accordance with an arithmetic instruction, a holding circuit storing status information about the arithmetic operation by the arithmetic circuit and a logic circuit having a function of a logic operation. The logic circuit receives the status information stored in the holding circuit and the status information about a present result of arithmetic operation. The arithmetic circuit further includes a selector for selecting either the status information about the present result of arithmetic operation or a signal outputted form the logic circuit in accordance with a control signal based on the arithmetic instruction. The selector supplies the selected signal to the holding circuit.
Claims20
An arithmetic circuit, comprising:
- an arithmetic circuit performing an arithmetic operation of a predetermined bit width in accordance with an arithmetic instruction;
- a holding circuit storing status information about the arithmetic operation by the arithmetic circuit;
- a logic circuit having a function of a logic operation, the logic circuit receiving the status information stored in the holding circuit and the status information about a present result of arithmetic operation;
- and
- a selector for selecting either the status information about the present result of arithmetic operation or a signal outputted from the logic circuit in accordance with a control signal based on the arithmetic instruction and supplying the selected signal to the holding circuit.
An arithmetic circuit, comprising:
- an arithmetic circuit performing an arithmetic operation of a predetermined bit width in accordance with an arithmetic instruction and outputting a result of the arithmetic operation;
- a determination circuit outputting a determination signal when the result of the arithmetic operation is zero;
- a holding circuit storing the determination signal;
- a logic circuit receiving the determination signal stored in the holding circuit and the output of the determination circuit and outputting the determination signal when both of the received signals are the determination signals;
- and
- a selector for selecting either the output signal of the logic circuit or the output signal of the holding circuit and for outputting a signal to the holding circuit.
An arithmetic circuit, comprising:
- an arithmetic circuit performing an arithmetic operation of a predetermined bit width in accordance with an arithmetic instruction and outputting a result of the arithmetic operation, the arithmetic circuit further outputting a carry signal when the result of the arithmetic operation produces a carry;
- a holding circuit storing the carry signal;
- a logic circuit receiving the carry signal stored in the holding circuit and the carry signal outputted from the arithmetic circuit, the logic circuit outputting the carry signal when it receives the carry signal;
- and
- a selector for selecting either the output signal of the arithmetic circuit or the output signal of the logic circuit in accordance with the arithmetic instruction.
Dependencies are inferred from the claim text.