Transmitter Encoder

The 64/66b encoder converts 8 data octets and 1 control octet into one 66b transmission block according to IEEE 802.3 spec Clause 49.

There are 6 reserved codes along with low power idle, and signal and sequence ordered sets (including the auto-negotiation ordered set). There are only 15 valid data block formats. If none of these formats is detected, the encoder issues an error message.

This module is also supports the scrambled idles test pattern as described in IEEE 802.3 Clause 107. Any input data from the MAC is ignored and the encoder outputs a continuous stream of encoded Idle blocks to the scrambler.