44 www.xilinx.com RocketIO™ X Transceiver User Guide1-800-255-7778 UG035 (v1.5) November 22, 2004Chapter 2: Digital Design ConsiderationsRThe following static signals are inputs that control the PCS interblock routing and bypassfor particular blocks, which adjust the architecture of the PCS for the user’s particularapplication:• RXBLOCKSYNC64B66BUSE• RXDEC64B66BUSE• RXDEC8B10BUSE• RXDESCRAM64B66BUSE• RXCOMMADETUSE• TXENC64B66BUSE• TXENC8B10BUSE• TXGEARBOX64B66BUSE• TXSCRAM64B66BUSEThe following static signals are inputs that control various functions, but are usually setonce at the beginning of a state machine, or after an auto-negotiation sequence. They aretypically not altered on a clock-by-clock basis:• ALIGN_COMMA_WORD• ENMCOMMAALIGN• ENPCOMMAALIGN• RXPOLARITY• TXPOLARITY• PMAINIT• RXIGNOREBTF• PMARXLOCKSEL[1:0]The following static signals are inputs that cause either major functional resets or are usedin troubleshooting. These signals are mostly used at initialization, not during thefunctional operation of the circuit:• LOOPBACK[1:0] (Note: This signal can also be a dynamic signal.)• POWERDOWN• RXRESET• TXRESET• TXINHIBITDynamic SignalsThe following dynamic signals indicate data received on the receive bus, along with statussignals that indicate specific information about RXDATA. The set values of these signalsdefine the application setup by the user and are the most important after the static signalsare allocated:• MCOMMA_10B_VALUE• PCOMMA_10B_VALUE• COMMA_10B_MASK• RXCHARISCOMMA[7:0]• RXCHARISK[7:0]
