Performing read and write operations in the same cycle for an SRAM device
View Patent ↗A decoding signal circuit is configured to generate a dual operation decoding signal that enables a read operation and a write operation to be performed in one clock cycle. The decoding signal circuit is configured such that a read decoding signal and a write decoding signal are generated and multiplexed together to form the dual operation decoding signal. The memory device receives a read address and a write address consecutively in one cycle to generate the dual operation decoding signal. A single operation, such as a read only operation or a write only operation, can be performed as well as the dual operation of performing the read operation and the write operation in the same cycle.
1. A circuit to generate a decoding signal for a memory device:
a clock generating circuit configured to receive an external clock signal, to generate a read pulse in response to a rising edge of the external clock signal, and to generate a write pulse in response to a falling edge of the read pulse; and
a decoding signal circuit coupled to receive the read pulse and the write pulse from the clock generating circuit, wherein the decoding signal circuit is configured to generate a decoding signal in response to the read pulse and the write pulse, further wherein the decoding signal corresponds to a read operation and a write operation executed in one cycle of the external clock signal.
2. The circuit of claim 1 wherein the decoding signal circuit is further configured to receive a read memory address and a write memory address and to generate the decoding signal according to the read memory address and the write memory address.
3. The circuit of claim 2 wherein the decoding signal circuit comprises a first latching circuit configured to generate a read decoding signal according to the read pulse and the read address, wherein the read decoding signal corresponds to the read operation.
4. The circuit of claim 3 wherein the decoding signal circuit further comprises a second latching circuit configured to generate a write decoding signal according to the write pulse and the write address, wherein the write decoding signal corresponds to the write operation.
5. The circuit of claim 4 wherein a duty cycle of the decoding signal comprises a duty cycle of the read pulse plus a duty cycle of the write pulse.
6. The circuit of claim 5 wherein the duty cycle of the decoding signal further comprises a gap time between generating the read decoding signal and generating the write decoding signal.
7. The circuit of claim 6 wherein the decoding signal circuit comprises a third latching circuit configured to generate a high decoding signal during the gap time.
8. The circuit of claim 2 wherein if the read memory address and the write memory address are the same memory address, then the decoding signal circuit is configured to generate a single decoding signal directed to the memory address.
9. The circuit of claim 2 wherein if the read memory address is different than the write memory address, then the decoding signal circuit is configured to generate a read decoding signal directed to the read memory address and a write decoding signal directed to the write memory address.
10. The circuit of claim 1 wherein the memory device comprises a high-speed SRAM device.