Data communication systems with forward error correction
Embodiments of the present invention include an apparatus that receives date from multiple lanes, which are then aligned and synchronized for transcoding and encoding.
1. A communication apparatus comprising:
a plurality of communication lanes, each of communication lanes being configured to receive data streams in 25 Gbps, 40 Gbps, 50 Gbps, and/or 100 Gbps modes;
a plurality of de-skew compensators corresponding to the plurality of communication lanes, the plurality of de-skew compensators being configured to remove skews from the received data streams at a first clock rate;
an alignment module being configured to generate an aligned data stream based on the de-skewed data streams from the plurality of de-skew compensators, the alignment module being configured to operate at a second clock rate, the aligned data stream comprising a first plurality of words, the first plurality of words being characterized by a first word length;
a transcoder module being configured to generate alternating data streams based using the aligned data stream, the transcoder being configured to operate at a third clock rate, the alternating data streams comprising a second plurality of words, the second plurality of words being characterized by a second word length, the transcoder being operative in two or more modes;
an FEC module being configured to encode the alternating data streams to generate a first encoded data stream and a second encoded data stream;
a first gearbox being configured to process the first encoded data stream; and
a second gearbox being configured to process the second encoded data stream.
2. The apparatus of claim 1 further comprising an alignment processing module for updating alignment markers in the aligned data stream.
3. The apparatus of claim 2 wherein the alignment processing module comprises an alignment marker mapper.
4. The apparatus of claim 1 wherein the transcoder is operative in 40 Gbps PAM-4 mode and 100 Gbps PAM-8 mode.
5. The apparatus of claim 4 wherein the transcoder processes input in every clock cycle when operating in the 100 Gbps PAM-8 mode.
6. The apparatus of claim 5 wherein the transcoder processes input in every four clock cycles when operating in the 40 Gbps PAM-4 mode.
7. The apparatus of claim 1 further comprising a pattern generator module coupled to the first gearbox.
8. The apparatus of claim 7 wherein the pattern generator module supports a plurality of PRBS patterns and inverse PRBS patterns.
9. The apparatus of claim 7 wherein the pattern generator supports a customer stored in a predetermined memory location.
10. The apparatus of claim 1 wherein the alignment module is configured to insert alignment markers at predetermined locations.
11. The apparatus of claim 1 wherein the transcoder concatenates a predetermined number of words from the aligned data stream.
12. The apparatus of claim 1 wherein FEC module operates at the third clock rate.
13. The apparatus of claim 1 wherein the first gearbox and the second gearbox operates at the third clock rate.
14. The apparatus of claim 1 further a first grey mapping module for processing output of the first gear box, the first grey mapping module being configured to operate at a fourth clock rate.
15. The apparatus of claim 1 further comprising a plurality of pseudo random bit sequence (PRBS) checker configured to check the data signal streams.
16. The apparatus of claim 1 wherein the plurality of de-skew compensators is configured to provide a protocol lock finite state machine.
17. The apparatus of claim 1 wherein the first gearbox is configured to divide the first encoded data stream into two data streams.
18. The apparatus of claim 1 further comprising a first MUX device coupled to outputs of the first gearbox, the MUX device being configured to select outputs based on at least a PRBS mode.
19. A communication apparatus comprising:
a plurality of communication lanes, each of communication lanes being configured to receive data signal streams in 25 Gbps, 40 Gbps, 50 Gbps, and/or 100 Gbps modes;
a plurality of de-skew compensators corresponding to the plurality of communication lanes, the plurality of de-skew compensators being configured to removing skews from the received data streams at a first clock rate;
an alignment module being configured to generate an aligned data stream based on the de-skewed data streams from the plurality of de-skew compensators, the alignment module being configured to operate at a second clock rate, the aligned data stream comprising a first plurality of words, the first plurality of words being characterized by a first word length;
a transcoder module being configured to generate alternating data streams based using the aligned data stream, the transcoder being configured to operate at a third clock rate, the alternating data streams comprising a second plurality of words, the second plurality of words being characterized by a second word length, the transcoder being operative in two or more modes;
an FEC module being configured to encode the alternating data streams to generate a first encoded data stream and a second encoded data stream;
a first gearbox being configured to process the first encoded data stream and divide the first encoded data stream into two data streams; and
a first MUX device coupled to the first gearbox, the first MUX device being configured to select between the two data streams based on a PRBS mode.
20. A communication apparatus comprising:
a plurality of communication lanes, each of communication lanes being configured to receive data signal streams in 25 Gbps, 40 Gbps, 50 Gbps, and/or 100 Gbps modes;
a plurality of de-skew compensators corresponding to the plurality of communication lanes, the plurality of de-skew compensators being configured to removing skews from the received data streams at a first clock rate;
an alignment module being configured to generate an aligned data stream based on the de-skewed data streams from the plurality of de-skew compensators, the alignment module being configured to operate at a second clock rate, the aligned data stream comprising a first plurality of words, the first plurality of words being characterized by a first word length;
a transcoder module being configured to generate alternating data streams based using the aligned data stream, the transcoder being configured to operate at a third clock rate, the alternating data streams comprising a second plurality of words, the second plurality of words being characterized by a second word length, the transcoder being operative in two or more modes;
an FEC module being configured to encode the alternating data streams to generate a first encoded data stream and a second encoded data stream;
a first gearbox being configured to process the first encoded data stream and divide the first encoded data stream into two data streams; and
a pattern generator coupled to the first gearbox and being configured to generate patterns inserted into the two data streams.