Xilinx Virtex-6 FPGA User Manual

Virtex-6 FPGA GTX Transceivers User Guide www.xilinx.com 201
UG366 (v2.5) January 17, 2011
RX Equalizer
Table 4-16 provides DFETAP1 and RXEQMIX settings for 6.25 Gb/s operation for
chip-to-chip applications.
Example – RX Linear Equalizer and DFE Settings for Backplane Applications
Table 4-17 provides DFETAP1 and RXEQMIX settings for 3.125 Gb/s operation for
backplane applications.
42 [1066.8] 16.5 5 0
50 [1270.0] 18.0 10 5
70 [1778.0] 25.1 10 5
Notes:
1. GTX TXDIFFCTRL = 4'b1010, TXPOSTEMPHASIS = 5'b00000, and TXPREEMPHASIS = 4'b0000.
Table 4-15: DFETAP1 and RXEQMIX at 5 Gb/s for Chip-to-Chip Applications (Cont’d)
Nominal Trace
Length on FR4
Substrate
(inches [mm])
Loss (dB) @
2.5 GHz
TAP1
RXEQMIX = 000 RXEQMIX = 010 RXEQMIX = 101 RXEQMIX = 110 RXEQMIX = 111
Table 4-16: DFETAP1 and RXEQMIX at 6.25 Gb/s for Chip-to-Chip Applications
Nominal Trace
Length on FR4
Substrate
(inches [mm])
Loss (dB) @
3.125 GHz
TAP1
RXEQMIX = 000 RXEQMIX = 010 RXEQMIX = 101 RXEQMIX = 110 RXEQMIX = 111
13 [330.2] 4.5
0 0
20 [508.0] 7.9
00
30 [762.0] 15.4 10 0
42 [1066.8] 20.1 10 5
50 [1270.0] 22.7 15 5
70 [1778.0] 30.2 15 15
Notes:
1. GTX TXDIFFCTRL = 4'b1010, TXPOSTEMPHASIS = 5'b00000, and TXPREEMPHASIS = 4'b0000.
Table 4-17: DFETAP1 and RXEQMIX at 3.125 Gb/s for Backplane
Applications
Nominal Trace
Length on FR4
Substrate
(inches [mm])
Loss (dB) @
1.5625 GHz
TAP1
RXEQMIX = 000 RXEQMIX = 010 RXEQMIX = 110
24 [609.6]
(2)
8.1 00
40 [1016.0]
(3)
10.3 00
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Xilinx Virtex-6 FPGA Specifications

General

Brand	Xilinx
Model	Virtex-6 FPGA
Category	Transceiver
Language	English