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US 5,400,284 AGranted
Semiconductor integrated circuit
AssigneeKabushiki Kaisha Toshiba
InventorsShingo Hanatani, Kazumasa Ando
Life of this patent
Estimating the term…
Abstract
A precharge transistor precharges a bus. A discharge transistor discharges the bus. A push-pull driver is connected to the bus, and consists of a p-channel MOS transistor and an n-channel MOS transistor. The push-pull driver sets the potential of the bus to "H" level or "L" level. A detection circuit detects which one of the discharge transistor and the push-pull driver is being driven. When the push-pull drive is being driven, a control circuit renders the precharge transistor inoperative.
Claims8
A semiconductor integrated circuit comprising:
- a bus;
- precharge means for precharging the bus;
- discharge means responsive to a clock signal for discharging the bus while the precharge means does not precharge the bus;
- drive means, consisting of two transistors, for driving the transistors independently to set the potential of the bus to a high level or a low level;
- detection means for detecting which one of the discharge means and the drive means is being driven;
- and
- control means responsive to the clock signal and a signal output from the detection means, for rendering the precharge means inoperative when at least the drive means is being driven.
4 more elements
A semiconductor integrated circuit comprising:
- a bus;
- a first circuit including a ROM, a RAM and a CPU which frequently output data items to the bus;
- a second circuit including an I/O which outputs data items to the bus less frequently than the first circuit;
- precharge means for precharging the bus;
- discharge means, connected between the second circuit and the bus, for discharging the bus while the precharge means does not precharge the bus;
- drive means, consisting of two transistors connected between the first circuit and the bus, for driving the transistors independently to set the potential of the bus to a high level or a low level;
- detection means for detecting which one of the discharge means and the drive means is being driven;
- and
- control means responsive to the clock signal and a signal output from the detection means, for rendering the precharge means inoperative when at least the drive means is being driven.
6 more elements
Dependencies are inferred from the claim text.