114 www.xilinx.com Virtex-4 RocketIO MGT User GuideUG076 (v4.1) November 2, 2008Chapter 3: PCS Digital Design Considerations RRXNOTINTABLERXNOTINTABLE is set to a logic 1 whenever the received data is not in the 8B/10B tables.The data received on bytes marked by RXNOTINTABLE is the raw 10-bit data, as follows....and so forth.This port is also byte-mapped to RXDATA and is only used when the 8B/10B decoder isenabled.RXCHARISCOMMARXCHARISCOMMA is a status signal byte-mapped to RXDATA. If the 10-bit symbolreceived by the decoder is a K-character (based on the DEC_PCOMMA_DET,DEC_MCOMMA_DET and DEC_VALID_COMMA_ONLY attributes),RXCHARISCOMMA is a 1.The DEC_PCOMMA_DET and DEC_MCOMMA_DET attributes enableRXCHARISCOMMA.The DEC_VALID_COMMA_ONLY attribute decides (if enabled) whetherRXCHARISCOMMA indicates only valid commas.This is illustrated in Table 3-7.Byte 0:Bit 9 - RXCHARISK[0]Bit 8 - RXRUNDISP[0]Bit[7:0] - RXDATA[7:0]Byte 1:Bit 9 - RXCHARISK[1]Bit 8 - RXRUNDISP[1]Bit[7:0] - RXDATA[15:8]Table 3-7: RXCHARISCOMMA Truth TableDEC_VALID_COMMA_ONLYTRUEDEC_PCOMMA_DETTRUERXCHARISCOMMA = 1 indicates apositive-disparity 10-bit codecorresponding to valid K28.1, K28.5,and K28.7 characters.FALSE RXCHARISCOMMA does not respondto positive-disparity commas.DEC_MCOMMA_DETTRUERXCHARISCOMMA = 1 indicates anegative-disparity 10-bit codecorresponding to valid K28.1, K28.5,and K28.7 characters.FALSE RXCHARISCOMMA does not respondto negative-disparity commas.FALSEDEC_PCOMMA_DETTRUE RXCHARISCOMMA = 1 indicates10-bit codes with xxx1111100.FALSE RXCHARISCOMMA does not respondto positive-disparity commas.DEC_MCOMMA_DETTRUE RXCHARISCOMMA = 1 indicates10-bit codes with xxx0000011.FALSE RXCHARISCOMMA does not respondto negative-disparity commas.
