Granted Patent B2

US 7,286,572 · App. 10/338,972 · Granted Oct 23, 2007

Abstract

Claims (55)

1. A serializer comprising:

a serdes framer interface (SFI) circuit for recovering a first set of data channels and a reference channel and for realigning said first set of data channels relative to a reference channel to create a second set of data channels,

a clock multiplier unit (CMU) coupled to said SFI circuit, said CMU for receiving a clock frequency, for translating said clock frequency to a higher clock frequency, and for providing a clock signal to said SFI circuit,

a multiplexing circuit coupled to said CMU, said multiplexing circuit for receiving said second set of data channels and for merging said second set of data channels into one data channel,

an output driver stage coupled to said multiplexing circuit, said output driver stage for translating said one data channel into an output data channel,

a reference selection circuit coupled to said CMU, said reference selection circuit for selecting a reference clock, for filtering said reference clock, and for providing to said CMU one of said selected reference clock or a filtered reference clock,

wherein a data rate of said one data channel is higher than a data rate of said second set of data channels.

2. The serializer of claim 1 ,

wherein a data rate of said first set of data channels is about 2.5 gigabits per second,

wherein a data rate of said output data channel is about 40 gigabits per second.

3. The serializer of claim 1 , further comprising:

a pseudo random pattern generator and error checker (PR) circuit coupled to said SFI circuit and said multiplexing circuit, said PR circuit for generating a pseudo random pattern and for performing error checking.

4. The serializer of claim 3 ,

wherein said PR circuit is capable of producing a pseudo random pattern and performing error checking substantially concurrently and independently,

wherein said PR circuit comprises a word error checker, an individual channel error checker, and a pass-through circuit.

5. The serializer of claim 1 , wherein said SFI circuit comprises:

a data recovery circuit (DR) for receiving and recovering said first set of data channels and said reference channel,

a first-in-first-out circuit (FIFO) coupled to said DR, said FIFO for synchronizing said first set of data channels to said clock signal and for tracking data wander,

a deskew circuit coupled to said FIFO, said deskew circuit for deskewing data channels to generate said second set of data channels.

6. The serializer of claim 1 ,

wherein said reference selection circuit includes a reference clock clean-up loop phase detector.

7. The serializer of claim 1 ,

wherein said CMU is for generating a half-rate clock signal and a quarter-rate clock signal.

8. The serializer of claim 1 ,

wherein said serializer is for having power consumption of not more than 4 watts during operation.

9. The serializer of claim 1 ,

wherein said SFI circuit is for receiving SFI-5 compliant signals and performing SFI-5 compliant clock synchronization and deskew functions.

10. An integrated circuit comprising:

a serdes framer interface (SFI) circuit for receiving a first set of data channels and a reference channel, generating first logic levels for said first set of data channels, and realigning said first set of data channels relative to a reference channel,

a multiplexing circuit coupled to said SFI circuit, said multiplexing circuit for receiving a second set of data channels and for merging said second set of data channels into one or more data channels,

wherein said second set of data channels is generated based on said first set of data channels,

wherein a data rate of said one or more data channels is higher than a data rate of said second set of data channels,

wherein said one or more data channels have less number of channels than said second set of data channels,

wherein said SFI circuit and said multiplexing circuit are integrated into one semiconductor chip.

11. The integrated circuit of claim 10 , further comprising:

an output driver stage coupled to said multiplexing circuit, said output driver stage for translating said one or more data channels into an output data channel,

wherein said output driver stage is integrated into said one semiconductor chip.

12. The integrated circuit of claim 11 , further comprising:

a modulator driver coupled to said output driver stage,

wherein said modulator driver is integrated into said one semiconductor chip.

13. The integrated circuit of claim 10 , further comprising:

a clock multiplier circuit (CMU) coupled to said SFI circuit and said multiplexing circuit, said CMU for receiving a clock frequency, translating said clock frequency to a higher clock frequency,

wherein said CMU is integrated into said one semiconductor chip.

14. The integrated circuit of claim 13 , further comprising:

a reference selection circuit coupled to said CMU, said reference selection circuit for selecting a reference clock, for filtering said reference clock, and for providing to said CMU one of said selected reference clock or a filtered reference clock,

wherein said reference selection circuit is integrated into said one semiconductor chip.

15. The integrated circuit of claim 10 , further comprising:

a pseudo random pattern generator and error checker (PR) circuit coupled to said SFI circuit, said PR circuit for generating a pseudo random pattern and for performing error checking,

wherein said PR circuit is integrated into said one semiconductor chip.

16. The integrated circuit of claim 11 ,

wherein said output driver stage is a CML driver output stage for providing an output voltage swing not less than 0.9 volt peak-to-peak.

17. The integrated circuit of claim 11 , further comprising:

wherein said first set of data channels is differential, and said output data channel is differential.

18. The integrated circuit of claim 10 ,

wherein said SFI circuit is for receiving SFI-5 compliant signals and performing SFI-5 compliant clock synchronization and deskew functions.

Assignments (8)