Semiconductor storage device
AssigneesMitsubishi Electric Engineering Company Limited, Mitsubishi Denki Kabushiki Kaisha
InventorsShinichi Masuda, Takashi Hashimoto
Life of this patent
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Abstract
It is an object to provide a semiconductor storage device having an optimized sense enable time to reduce unnecessary power consumption. An output node (N1) of a sense amplifier (SA) is connected to an input of a tristate buffer (delay means) (TB) and an output node (N2) of the tristate buffer (TB) is connected to an input of an inverter (I1) forming data holding means (L1). The output nodes (N2 and N3) are connected to inputs of an EXNOR circuit (G1) and an output node (N4) of the EXNOR circuit (G1) is connected to a reset circuit (RS).
Claims10
A semiconductor storage device comprising data reading means for reading data held in a memory cell,
- wherein said data reading means comprises,
- sense amplifying means responsive to a read control signal periodically provided for amplifying and outputting said data,
- data holding means receiving an output of said sense amplifying means for temporarily holding said data and then outputting said data to an external output terminal,
- data comparing means for comparing held data outputted from said sense amplifying means in a first cycle of said read control signal and held in said data holding means and before-held data outputted from said sense amplifying means in a second cycle of said read control signal and not held in said data holding means yet to output its comparison result, and
- signal changing means connected to said data comparing means for changing said read control signal according to said comparison result,
- wherein said read control signal includes, in its one cycle, an activating signal for activating said sense amplifying means so that said data is amplified and outputted, and a deactivating signal for deactivating said sense amplifying means, and
- said signal changing means forces said activating signal to change to said deactivating signal when said comparison result exhibits a predetermined result.
Dependencies are inferred from the claim text.