Xilinx Virtex-6 FPGA

200 www.xilinx.com Virtex-6 FPGA GTX Transceivers User Guide
UG366 (v2.5) January 17, 2011
Chapter 4: Receiver
Table 4-14 provides DFETAP1 and RXEQMIX settings for 4.25 Gb/s operation for
chip-to-chip applications.
Table 4-15 provides DFETAP1 and RXEQMIX settings for 5 Gb/s operation for
chip-to-chip applications.
Table 4-13: DFETAP1 and RXEQMIX at 3.125 Gb/s for Chip-to-Chip Applications
Nominal Trace
Length on FR4
Substrate
(inches [mm])
Loss (dB) @
1.5625 GHz
TAP1
RXEQMIX = 000 RXEQMIX = 010 RXEQMIX = 101 RXEQMIX = 110 RXEQMIX = 111
13 [330.2] 2.8
00
20 [508.0] 4.7 00
30 [762.0] 8.9 0 0
42 [1066.8] 11.7 0 0
50 [1270.0] 13.0 0 0
70 [1778.0] 17.8 0 0
Notes:
1. GTX TXDIFFCTRL = 4'b1010, TXPOSTEMPHASIS = 5'b00000, and TXPREEMPHASIS = 4'b0000.
Table 4-14: DFETAP1 and RXEQMIX at 4.25 Gb/s for Chip-to-Chip Applications
Nominal Trace
Length on FR4
Substrate
(inches [mm])
Loss (dB) @
2.125 GHz
TAP1
RXEQMIX = 000 RXEQMIX = 010 RXEQMIX = 101 RXEQMIX = 110 RXEQMIX = 111
13 [330.2] 3.4
0 0
20 [508.0] 5.7
00
30 [762.0] 11.7 0 0
42 [1066.8] 14.8 0 0
50 [1270.0] 16.1 10 0
70 [1778.0] 22.3 5 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
Nominal Trace
Length on FR4
Substrate
(inches [mm])
Loss (dB) @
2.5 GHz
TAP1
RXEQMIX = 000 RXEQMIX = 010 RXEQMIX = 101 RXEQMIX = 110 RXEQMIX = 111
13 [330.2] 3.8
0 0
20 [508.0] 6.4
00
30 [762.0] 13.0 5 0
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