RocketIO™ X Transceiver User Guide www.xilinx.com 159UG035 (v1.5) November 22, 2004 1-800-255-7778Register Definition RDAC mode, the center frequency is controlled by the value of VCODAC[5:0]. The receivercenter frequency control is defined as follows:RXVCOGAINRXVCOGAIN selects between low and high gain of the receiver VCO. The default is 1(High). The receiver VCO gain control is defined as follows:RXVSEL[1:0]RXVSEL[1:0] selects the receiver regulator voltage. The default is 00 (Nominal). Thereceiver regulator voltage selection is defined as follows:RXREG[1:0]RXREG[1:0] sets the receiver VCO regulator output current. The default is primitivedependent. The receiver regulator current is defined as follows:Table C-30: RXVCODAC DefinitionRXVCODAC RX VCO Center Frequency0 Automatic (Default)1 DAC ControlledTable C-31: RXVCOGAIN DefinitionRXVCOGAIN RX VCO Gain0 Low1 High (Default)Table C-32: RXVSEL[1:0] DefinitionRXVSEL[1:0] RX Regulator00 Nominal (Default)01 High Vdd10 Low Vdd11 Voltage DividerTable C-33: RXREG[1:0] DefinitionRXREG[1:0] RX Regulator Current00 13 mA01 27 mA10 40 mA11 53 mA
