Configurable Tx Driver; Overview - Xilinx Virtex-5 RocketIO GTP User Manual

Chapter 6: GTP Transmitter (TX)

Configurable TX Driver

Overview

The GTP TX driver is a high-speed current-mode differential output buffer. To maximize
signal integrity, it includes the following features:
•
•
•
The impact of each of these features on signal integrity depends on the board and the
receiver. See
them to maximize signal integrity.
driver.
TxData[9:0]
PISO
10:1
TX Serial Clock
112
Differential voltage control
Pre-emphasis
Configurable termination impedance
Chapter 10, "GTP-to-Board Interface,"
Pre-Driver
TXBUFDIFFCTRL[2:0]
Pre-Driver
Figure 6-14: TX Driver Segments
www.xilinx.com
for a detailed discussion of how to use
Figure 6-14 shows the different segments of the TX
MGTAVTTTX
TXPREEMPHASIS[2:0]
Main
Pad Driver
TXDIFFCTRL[2:0]
Pre-emphasis
Pad Driver
TXPREEMPHASIS[2:0]
Virtex-5 RocketIO GTP Transceiver User Guide
R
MGTTXN
MGTTXP
UG196_c6_14_051107
UG196 (v1.3) May 25, 2007