Xilinx Virtex-5 RocketIO GTP

Virtex-5 RocketIO GTP Transceiver User Guide www.xilinx.com 265
UG196 (v1.3) May 25, 2007
Pre-emphasis, Differential Swing, and Equalization
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Table A-13: Signal Optimization Attributes and Ports
Description
Virtex-II Pro
MGT
Virtex-4
MGT
Virtex-5 GTP Transceiver
(1)
Attributes Ports
Controls TX pre-emphasis
and edge rate
TX_PREMPHASIS
TXPRE_PRDRV_DAC
TXPRE_TAP_PD
TXSLEWRATE
TXPOST_PRDRV_DAC
TXDAT_PRDRV_DAC
TXPOST_TAP_PD
TXPREEMPHASIS[2:0]
Controls differential
amplitude of the
transmitted signal
TX_DIFF_CTRL
TXPRE_TAP_DAC
TXPOST_TAP_DAC
TXDAT_TAP_DAC
TX_DIFF_BOOST
TXBUFDIFFCTRL
TXDIFFCTRL
Active equalization N/A RXAFEEQ ------
RXENEQB
RXEQPOLE[3:0]
RXEQMIX[1:0]
Discrete equalization N/A RXEQ N/A N/A
Notes:
1. Signal optimization settings are independent between both GTP transceivers of a GTP_DUAL tile. GTP0 is indicated by the suffix “0” after
the signal name, and GTP1 is indicated by the suffix “1” (for example RXENEQB0, RXENEQB1).