US Patent 11841820 Precoding mechanism in PCI-express

In embodiments, an apparatus for serial communication includes a transceiver, to receive a precoding request from a downlink receiver across a serial communication link, and to transmit data bits to the downlink receiver over the serial communication link. In embodiments, the apparatus further includes a precoder, coupled to the transceiver, to: receive scrambled data bits of a subset of the data bits to be transmitted, from a coupled scrambler, and, in response to the request from the downlink receiver, precode the scrambled data bits, and output the precoded scrambled data bits to the transceiver, for transmission to the downlink receiver across the serial communication link together with other unscrambled data bits.