Semiconductor memory device
View Patent ↗In a semiconductor memory device, an update data control circuit is provided, which selectively couples a physical address input data line or an effective address input data line to a common input data line coupled to a physical address cell that stores a physical address page number. A control terminal of an update circuit of the physical address cell is coupled to a page size cell that stores page size information via an update control circuit, to control a write port of the physical address cell with the page size cell.
1. A semiconductor memory device comprising:
a first memory circuit;
a second memory circuit;
a readout circuit configured to read out data stored in the first memory circuit to a first output data line based on the data in the first memory circuit and a first control signal;
an update circuit configured to update the data in the first memory circuit to data on a first input data line using second input data from the second memory circuit; and
an update data control circuit having a function of selectively outputting first update data or second update data to the first input data line.
2. The semiconductor memory device of claim 1 , further comprising:
an update control circuit configured to control the update circuit based on the data in the second memory circuit.
3. The semiconductor memory device of claim 2 , wherein
the update circuit for the first memory circuit has a PMOS transistor having a source coupled to the first input data line, a drain coupled to the first memory circuit, and a gate coupled to a first update control signal output from the update control circuit and an NMOS transistor having a source coupled to the first input data line, a drain coupled to the first memory circuit, and a gate coupled to a second update control signal output from the update control circuit, and
the first update control signal is coupled to a first memory node of the second memory circuit via an inverter, and the second update control signal is coupled to a second memory node of the second memory circuit via an inverter.
4. The semiconductor memory device of claim 2 , wherein the update circuit and the readout circuit are coupled to a same node of the first memory circuit.
5. The semiconductor memory device of claim 4 , further comprising:
a power supply control circuit configured to control power supply of the first memory circuit based on the data in the second memory circuit.
6. The semiconductor memory device of claim 2 , wherein a second control signal is input into the update control circuit.
7. The semiconductor memory device of claim 1 , wherein
the semiconductor memory device has a function of translating a virtual address into a physical address, and
the first memory circuit is included in a physical address cell that stores a physical address, the second memory circuit is included in a page size cell that stores a page size, the first update data is a physical address, and the second update data is an effective address.
8. A semiconductor memory device comprising:
a first memory circuit;
a second memory circuit;
a readout circuit configured to read out data stored in the first memory circuit to a first output data line based on the data in the first memory circuit and a first control signal;
a first update circuit configured to update the data in the first memory circuit to first update data based on a second control signal; and
a second update circuit configured to update the data in the first memory circuit to second update data based on data stored in the second memory circuit.
9. The semiconductor memory device of claim 8 , further comprising:
an update control circuit configured to control the second update circuit based on the data in the second memory circuit.
10. The semiconductor memory device of claim 8 , wherein
the semiconductor memory device has a function of translating a virtual address into a physical address, and
the first memory circuit is included in a physical address cell that stores a physical address, the second memory circuit is included in a page size cell that stores a page size, the first update data is a physical address, and the second update data is an effective address.