Xilinx Virtex-6 FPGA User Manual page 201

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