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Synonym hit RAM - a 500-MHz CMOS SRAM macro with 576-bit parallel comparison and parity check functions

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8 Author(s)
Suzuki, T. ; Device Dev. Center, Hitachi Ltd., Tokyo, Japan ; Higeta, K. ; Fujimura, Y. ; Ando, K.
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A 1.5-ns-access 500-MHz synonym hit RAM has been developed using 0.25-/spl mu/m CMOS technology, which is the macro-cell to be used in microprocessor chips. We have proposed a virtual cache system with a synonym hit RAM, which achieves both high speed and large capacity because it solves the synonym problem that occurs with large-capacity cache systems. In this system, the RAM macro needs 576-bit parallel comparison and parity check functions. The configuration used achieves testability and low-power dissipation of large 576-bit data output. Moreover, the dynamic-NOR with a dynamic-inverter and sense-amplifier activation pulse generator are essential for reducing the comparison delay.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:35 ,  Issue: 2 )

Date of Publication:

Feb. 2000

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