RocketIO™ X Transceiver User Guide www.xilinx.com 161UG035 (v1.5) November 22, 2004 1-800-255-7778Register Definition RRXCPGAINRXCPGAIN selects between low and high gain of the receiver charge pump. The defaultis 1 (High). The receiver charge pump gain control is defined as follows:RXFLTCPT[4:0]RXFLTCPT[4:0] controls the phase adjustment of the receiver sample clock relative to thedata. RXFLTCPT[4] is the sign and RXFLTCPT[3:0] are binary weighted magnitude. Themagnitude is relative to the data unit interval (UI), with a range of ~±0.3UI.Note: Need to determine early/late relationship of the sign.VSELAFE[1:0]VSELAFE[1:0] sets the receiver analog front end (AFE) common mode input voltage. Thedefault is primitive dependent. The receiver AFE common mode voltage is defined asfollows:RXFEI[1:0]RXFEI[1:0] sets the receiver front end/equalizer current. The default is 11 (24 mA). Thereceiver front-end current is defined as follows:Table C-35: RXCPGAIN DefinitionRXCPGAIN RX Charge Pump Gain0 Low1 High (Default)Table C-36: VSELAFE[1:0] DefinitionVSELAFE[1:0] RX AFE Common Mode Input00 720 mV01 840 mV10 960 mV11 1080 mVTable C-37: RXFEI[1:0] DefinitionRXFEI[1:0] RX Front End Current00 6 mA01 12 mA10 18 mA11 24 mA (Default)
