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US 8,619,478 B2Granted
System and method for generating a clock
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsAnnie-Li-Keow Lum, Derek C. Tao, Bing Wang
Life of this patent
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Abstract
A first clock is received by a memory macro. In response to a first clock transition of the first clock, a first transition of a second clock and of a third clock is generated. A tracking transition of a tracking signal is caused by the second clock. Based on a later transition of a second clock transition of the first clock and the tracking transition of the tracking signal, a second transition of the third clock is generated. The third clock is for use by an input-output of the memory macro.
Claims20
A method comprising:
- responsive to a first clock transition of a first clock, causing a first transition of a second clock and of a third clock;
- and
- based on a later transition of a second clock transition of the first clock and a tracking transition of a tracking signal, causing a second transition of the third clock,
- wherein
- the first clock is received by a memory macro;
- the tracking transition of the tracking signal is caused by a tracking circuit driven by the first transition of the second clock;
- and
- the third clock is for use by an input-output of the memory macro.
5 more elements
A circuit comprising:
- a tracking circuit;
- a first circuit configured to cause a first transition of a first clock, a first transition of a second clock, and a first transition of a third clock, based on a first transition of a fourth clock;
- a second circuit configured to generate a second transition of the first clock based on a transition of a tracking signal;
- and
- a third circuit configured to generate a second transition of the third clock based on a second transition of the fourth clock or the transition of the tracking signal through the second transition of the first clock,
- wherein
- the tracking circuit is configured to cause the transition of the tracking signal responsive to the first transition of the second clock;
- and
- the second clock and the third clock are configured to be used in a memory macro.
6 more elements
A method comprising:
- utilizing a first transition of a first clock to cause a first transition of a second clock and a first transition of the third clock;
- utilizing, by a tracking circuit, the first transition of the second clock to cause a first transition of a fourth clock;
- utilizing, by the tracking circuit, a logic level of the fourth clock to cause a transition of a tracking signal;
- utilizing the transition of the tracking signal to cause a second transition of the second clock;
- and
- utilizing a second transition of the first clock or the second transition of the second clock to cause a second transition of the third clock,
- wherein
- the third clock and the fourth clock are used in a memory macro.
5 more elements
Dependencies are inferred from the claim text.