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Patent Title: Dynamic word line driver for cache

Assignee: IBM
Patent Number: US6222752
Issue Date: 04-24-2001
Application Number:
File Date:04-26-2000

Abstract: A method and apparatus is provided for implementing a cache control system effective to eliminate many of the timing problems occurring in dynamic, high bandwidth cache control systems. In one exemplary embodiment, a dummy content addressable memory (CAM) cell is provided and is strategically placed on the chip layout farthest away from the cache word line driver circuit. The dummy output signal is a required input to a cache hit evaluation circuit such that premature cache hit outputs are eliminated. The dummy cell is designed to quickly discharge a cache match line and indicate a non-hit status when any address bit line produces a mismatch indication, especially for expanded bandwidth and dynamic systems where the address lines are more extensive and the system is synchronized to predetermined clock cycles. The cache system further operates in a prefetch mode to determine hits for next in-line requested addresses. The system further includes implementations for test mode, refill, ICACHE block invalidation and cache reset signal generation.


Link to USPTO

IBM Pledge dated 1/11/2005