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词汇 Quad data rate
分类 英语词汇 英语翻译词典
释义

Quad data rate

英语百科

Quad data rate

A comparison between single data rate, double data rate, and quad data rate.
In QDR, the data lines operate at twice the frequency of the clock signal.

Quad data rate (QDR, or quad pumping) is a communication signaling technique wherein data are transmitted at four points in the clock cycle: on the rising and falling edges, and at two intermediate points between them. The intermediate points are defined by a second clock that is 90° out of phase from the first. The effect is to deliver four bits of data per signal line per clock cycle.

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