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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.
English (United States)
This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
68% of the total text.
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.
� � � � � 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...