Xilinx Virtex-6 FPGA User Manual page 195

X-Ref Target - Figure 4-10
25
20
15
10
5
0
-5
-10
6
10
Figure 4-10: Relative Gain Normalized to Low Frequency (Voltage Transfer Function)
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 4-11
www.BDTIC.com/XILINX
Virtex-6 FPGA GTX Transceivers User Guide
UG366 (v2.5) January 17, 2011
8
7
10
10
RXP
Linear
EQ
Termination
RXN
www.xilinx.com
9
10
Frequency (Hz)
P
DFE
N
Figure 4-11: DFE in the GTX RX
RX Equalizer
RXEQMIX = 000
RXEQMIX = 001
RXEQMIX = 010
RXEQMIX = 011
RXEQMIX = 100
RXEQMIX = 101
RXEQMIX = 110
RXEQMIX = 111
10
10
UG366_c4_09_051509
2 16 or 20
CDR SIPO
DIV4 / DIV5
UG366_c4_10_051509
11
10
195