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An unclocked word-line falling edge slope sharpener for self-timed word lines

IP.com Disclosure Number: IPCOM000009513D
Publication Date: 2002-Aug-28
Document File: 2 page(s) / 43K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is an unclocked word-line falling edge slope sharpener for self-timed word lines. Benefits include improved noise margins and the potential for higher frequency operation.

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An unclocked word-line falling edge slope sharpener for self-timed word lines

Disclosed is an unclocked word-line falling edge slope sharpener for self-timed word lines. Benefits include improved noise margins and the potential for higher frequency operation.

Description

        � � � � � Disclosed below is a falling edge word-line slope sharpener for a self-timed circuit at the far end of a word line. The disclosed method and apparatus generates a falling edge for the far –end of a word line triggered off the rising edge of the word line (see Figure 1). A delay is built into the generator so that the word line starts to fall at the same time it would without the sharpener such that the word-line pulse width is unaffected.

        � � � � � To enable tracking across process corners, the delay chain in the sharpener is made as similar as possible to the delay chain in the conventional word-line pulse generator.

        � � � � � Long word lines (such as those for 64-bit architecture register files) have very poor slopes at the far end. The use of the disclosed sharpener dramatically improves the slope of the falling edge (see Figure 2). This approach enables increased precharge time between word-line pulses (more time for the evaluation phase) and ensures that the word line is turned off completely before the next read/write operation, reducing the chances of a false read or write.

        � � � � � Before the sharpener was added on the word lines, simulations indicated that a register file word line had...