Glitch free power-up for a programmable array
First Claim
Patent Images
1. Structure comprising:
- a signal line connected to a circuit for driving said circuit;
a first plurality of storage elements connected to said signal line;
means for clamping said signal line at a first specified signal level for a selected time during power-down of said structure; and
means for maintaining said signal line at a predetermined signal range for a selected time during power-up of said structure to prevent said signal line from developing a voltage glitch during power-up.
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Accused Products
Abstract
Dummy circuitry, including a dummy input buffer, associated lines, and an additional row in the PLD array, provides an additional input to the PLD to keep the voltage on the bit line low until the correct input signal has fully propagated through the working input buffer and associated lines, thereby preventing a voltage glitch.
12 Citations
19 Claims
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1. Structure comprising:
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a signal line connected to a circuit for driving said circuit; a first plurality of storage elements connected to said signal line; means for clamping said signal line at a first specified signal level for a selected time during power-down of said structure; and means for maintaining said signal line at a predetermined signal range for a selected time during power-up of said structure to prevent said signal line from developing a voltage glitch during power-up. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Structure comprising:
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a signal line connected to a circuit for driving said circuit; a first plurality of storage elements connected to said signal line; means for clamping said signal line at a first specified signal level for a selected time during power down of said structure; and a second plurality of storage elements for maintaining said signal line at a predetermined signal range for a selected time during power-up of said structure to prevent said signal line from developing a voltage glitch during power-up. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification