Non-volatile semiconductor memory device and semiconductor memory device
View Patent ↗For each memory block, a predecoder for predecoding an applied address signal, an address latch circuit for latching the output signal of the predecoder, and a decode circuit for decoding an output signal of the address latch circuit and performing a memory cell selecting operation in a corresponding memory block are provided. Propagation delay of latch predecode signals can be made smaller and the margin for the internal read timing can be enlarged. In addition, the internal state of the decoder and memory cell selection circuitry are reset to an initial state when a memory cell is selected and the internal data output circuitry is reset to an initial state in accordance with a state of internal data reading. Thus, a non-volatile semiconductor memory device that can decrease address skew and realize an operation with sufficient margin is provided.
1. A semiconductor memory device, comprising:
a memory array having a plurality of memory cells arranged in of rows and columns;
address latch circuitry for latching an address signal designating a memory cell of said memory array;
cell selecting circuitry for selecting an addressed memory cell of said memory array in accordance with a latched address signal of said address latch circuitry, said cell selecting circuitry resetting said address latch circuitry to an initial state after selection of said memory cell in a data read mode of operation; and
data reading circuitry for reading data of the memory cell selected by said cell selecting circuitry for generating an internal data in said data read mode of operation.
2. The semiconductor memory device according to claim 1 , wherein
said cell selecting circuitry resets said cell selecting circuitry concurrently with the resetting of said address latch circuitry, after the selection of said memory cell.
3. The semiconductor memory device according to claim 1 , wherein
said cell selecting circuitry stops an operation of said resetting, when a test mode is set.
4. The semiconductor memory device according to claim 1 , further comprising:
a data output circuit for generating an internal output data from the internal data received from said data reading circuitry; and
an output control circuit for monitoring a state of data reading from said data reading circuitry, and resetting said data output circuit in accordance with the monitored state.
5. The semiconductor memory device according to claim 4 , wherein
said data output circuit includes a data latch circuit for latching the internal data received from said data reading circuitry; and
said data output control circuit resets said data output circuit in response to a monitor signal generated in accordance with an activating signal controlling activation of said data reading circuitry.
6. The semiconductor memory device according to claim 4 , wherein
said output control circuit receives a monitor signal through a signal line providing a signal propagation delay corresponding to signal propagation delay of a signal propagation path from said data reading circuitry to said data output circuit, and resets said data output circuit in accordance with the received monitor signal, said monitor signal being generated in correspondence to an activating signal activating said data reading circuitry.