Importance

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Abstract

A bus driver circuit divides an internal data bus for an integrated circuit memory into at least two groups, designated by speed. A faster group of data lines and a slower group of data lines are placed in an interleaved fashion in order to provide a two group shielding solution. At the earliest opportunity following the reception of a read command, the data from memory banks in the memory is sorted into these two groups. For a DDR3 memory, the sorting method is based on the A2 column address, known as C2. All of the data is brought out of the banks in parallel and sorted as it enters the main amplifiers. These main amplifiers are also divided into two groups, faster and slower. Each amplifier then connects to a data line (G-line) of the same group. The clock assigned to the fast group fires right away, thereby connecting the data associated with the fast amplifiers to the fast data group. This data group then proceeds to the output buffers through the entire data path as fast as possible. The second, slower data group is started with a delayed clock signal and proceeds through the data path to the output buffer maintaining a fixed delay. Since the first and second data groups are not switching at the same time they act as shields to one another.

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First Claim