Synchronous semiconductor memory device
First Claim
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1. A synchronous semiconductor memory device comprising:
- first latch means for latching a write command in synchronism with a clock signal;
second latch means for latching a write data in synchronism with the clock signal and for outputting two write process signals based on the write data latched thereby;
pulse generating means for generating an internal write pulse signal based on the write command latched by said first latch means, said internal write pulse signal having a first logic level only in a write mode of the synchronous semiconductor memory device;
write control means supplied with said internal write pulse signal and said write process signals for controlling write and read operations of the synchronous semiconductor memory device;
memory means for storing the write data latched by said second latch means; and
noise preventing means coupled to said second latch means and said write control means for supplying said write process signals to said write control means only in the write mode responsive to said internal write pulse signal and for setting said write process signals to fixed potentials during a time other than the write mode.
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Abstract
A synchronous semiconductor memory device has a noise preventing part for preventing a noise from being transmitted to a memory cell array, where the noise is caused by a change in a write data.
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9 Claims
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1. A synchronous semiconductor memory device comprising:
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first latch means for latching a write command in synchronism with a clock signal; second latch means for latching a write data in synchronism with the clock signal and for outputting two write process signals based on the write data latched thereby; pulse generating means for generating an internal write pulse signal based on the write command latched by said first latch means, said internal write pulse signal having a first logic level only in a write mode of the synchronous semiconductor memory device; write control means supplied with said internal write pulse signal and said write process signals for controlling write and read operations of the synchronous semiconductor memory device; memory means for storing the write data latched by said second latch means; and noise preventing means coupled to said second latch means and said write control means for supplying said write process signals to said write control means only in the write mode responsive to said internal write pulse signal and for setting said write process signals to fixed potentials during a time other than the write mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification