Method for generating programmable data rate from a single clock
View Patent ↗A method for generating a wide range of clock rates from a single clock. A delta is generated from a first clock signal and a second clock signal. An accumulative offset is generated from adding the delta to a previous accumulative offset for each clock period of the first clock signal. Whenever an overflow is encountered, the value of the accumulative offset is truncated. The second clock signal is interpolated between adjacent values.
1. A method for generating a wide range of clock rates from a single clock, comprising the steps of:
generating a delta from a first clock signal and a second clock signal;
generating an accumulative offset from adding the delta to a previous accumulative offset for each clock period of the first clock signal;
truncating, when an overflow is encountered, the value of the accumulative offset; and
interpolating between values of the second clock signal.
2. The method as set forth in claim 1 , with the step of generating the delta from the first clock signal and the second clock signal includes the step of generating the delta from one minus a ratio of a first clock frequency of the first clock signal and a second clock frequency of the second clock signal.
3. The method as set forth in claim 1 , with the step of generating the delta from the first clock signal and the second clock signal includes the step of generating the delta from an amount of offset between corresponding clock edges of the first clock signal and the second clock signal.
4. The method as set forth in claim 1 , with the step of generating the accumulative offset from adding the delta to the previous accumulative offset for each clock period of the first clock signal, including having an initial value of the accumulative offset of zero.
5. The method as set forth in claim 4 , further including the step of setting the initial value of zero when clock edges of the first clock signal and the second clock signal are aligned.
6. The method as set forth in claim 1 , with the step of truncating, when the overflow is encountered, including the step of truncating when the value of the accumulative offset exceeds one, thereby making the accumulative offset having a value less than one.
7. The method as set forth in claim 1 , further the step of truncating, whenever an overflow is encountered, the value of the accumulative offset.
8. The method as set forth in claim 1 , with the step of interpolating including the step of linearly interpolating between adjacent values of the second clock signal.
9. A apparatus for generating a wide range of clock rates from a single clock, comprising:
a processor for generating a delta from a first clock signal and a second clock signal, and for generating an accumulative offset from adding the delta to a previous accumulative offset for each clock period of the first clock signal;
said processor for truncating, when an overflow is encountered, the value of the accumulative offset; and for interpolating between values of the second clock signal.
10. The apparatus as set forth in claim 9 , with the processor for generating the delta from one minus a ratio of a first clock frequency of the first clock signal and a second clock frequency of the second clock signal.
11. The apparatus as set forth in claim 9 , with processor for generating the delta from an amount of offset between corresponding clock edges of the first clock signal and the second clock signal.
12. The apparatus as set forth in claim 9 , with the processor for generating the accumulative offset from adding the delta to the previous accumulative offset for each clock period of the first clock signal, including having an initial value of the accumulative offset of zero.
13. The apparatus as set forth in claim 12 , with the processor for setting the initial value of zero when clock edges of the first clock signal and the second clock signal are aligned.
14. The apparatus as set forth in claim 9 , with the processor for truncating when the value of the accumulative offset exceeds one, thereby making the accumulative offset having a value less than one.
15. The apparatus as set forth in claim 9 , with the processor for truncating, whenever an overflow is encountered, the value of the accumulative offset.
16. The apparatus as set forth in claim 9 , with the processor for linearly interpolating between adjacent values of the second clock signal.