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Clause 91 Reed Solomon FEC
The Reed-Solomon Forward Error Correction (RS-FEC) IP Solution implements the RS-FEC sublayer specified in IEEE 802.3by/D3.1. This high through-put design is targeted for demanding, high frequency applications and provides bypass capabilities for direct access to sub designs. The target frequency is 390.625MHz for up to 100Gbps operation.
Features
- BASE-TX Core Features
- Implements base modules for the RS-FEC transmitter which includes RS encoder, 64b/66b to 256b/257b transcoder and gearbox logic
- Implements 4x66-bit interface for 64b/66b to 256b/257b transcoder
- Implements 257-bit to 330-bit gearbox logic for interconnection between transcoder and encoder
- Implements 330-bit encoder interface for Reed- Solomon code RS(528,514,10) with polynomial specified in 802.3by specifications
- High through-put, low latency encoder processes 33 symbols in parallel
- Valid based implementation allows discontinuous data flow and/or bandwidth controlled operation
- Implements a fixed latency memory-less design with direct access to RS encoder and transcoder blocks
- BASE-RX Core Features
- Implements base modules for the RS-FEC receiver which includes RS decoder a, 256b/257b to 64b/66b transcoder and gearbox logic
- Implements 330-bit decoder interface for Reed- Solomon code (528,514,10) with polynomial specified in 802.3by specifications
- Implements 330-bit to 257-bit gearbox logic for interconnection between decoder and transcoder
- Implements 257-bit interface for 64b/66b to 256b/257b transcoder
- High through-put decoder processes 33 symbols in parallel
- Decoder provides detection of uncorrectable codewords and corresponding 257-bit blocks are corrupted at transcoder output as per 802.3by specifications
- Direct access to RS decoder and transcoder blocks is available
- 25G-TX Core Features
- Implements all the features of BASE-TX Core
- Supports 25G codeword marker insertion with markers specified by 802.3by specifications
- 25G-RX Core Features
- Implements all the features of BASE-RX Core
- Implements 330-bit block synchronization state machine as specified in 802.3by specifications.
- Implements codeword monitor state machine as specified in 802.3by specifications
- 100G-TX Core Features
- Implements all the features of BASE-TX Core
- Supports 100G codeword marker insertion and mapping with markers specified by 802.3bj specifications
- Implements symbol distribution to four lanes as specified in 802.3bj specifications
- 100G-RX Core Features
- Implements all the features of BASE-RX Core
- Implements 330-bit block synchronization state machine as specified in 802.3bj specifications
- Implements alignment state machine as specified in 802.3bj specifications
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