Xilinx Virtex-6 FPGA User Manual

Virtex-6 FPGA GTX Transceivers User Guide www.xilinx.com 195
UG366 (v2.5) January 17, 2011
RX Equalizer
The Decision Feedback Equalizer enhances the internal eye by reducing the post-cursor tail
of the transmitted bit. It is a 4-tap architecture.
X-Ref Target - Figure 4-10
Figure 4-10: Relative Gain Normalized to Low Frequency (Voltage Transfer Function)
RXEQMIX = 000
RXEQMIX = 001
RXEQMIX = 010
RXEQMIX = 011
RXEQMIX = 100
RXEQMIX = 110
RXEQMIX = 111
RXEQMIX = 101
Frequency (Hz)
10
6
10
7
10
8
10
9
10
10
10
11
UG366_c4_09_051509
Gain (dB)
25
20
10
-5
-10
15
5
0
X-Ref Target - Figure 4-11
Figure 4-11: DFE in the GTX RX
RXP
RXN
Linear
EQ
Te r mi nation
DFE CDR SIPO
DIV4 / DIV5
16 or 20
2
P
N
UG366_c4_10_051509
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Xilinx Virtex-6 FPGA Specifications

General

Brand	Xilinx
Model	Virtex-6 FPGA
Category	Transceiver
Language	English