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Table 4-19: DFETAP1 and RXEQMIX at 5 Gb/s for Backplane Applications (Cont'd)
Notes:
1. GTX TXDIFFCTRL = 4'b1010, TXPOSTEMPHASIS = 5'b00000, and
2. Nominal 24 inches [609.6 mm] trace length = 6 inches [152.4 mm] backplane + 2 HmZD or eHSD
3. Nominal 40 inches [1016.0 mm] trace length = 20 inches [508 mm] backplane + 2 HmZD or eHSD
4. Nominal 60 inches [1524.0 mm] trace length = 40 inches [1016 mm] backplane + 2 HmZD or eHSD
Table 4-20
backplane applications.
Table 4-20: DFETAP1 and RXEQMIX at 6.25 Gb/s for Backplane Applications
Notes:
1. GTX TXDIFFCTRL = 4'b1010, TXPOSTEMPHASIS = 5'b00000, and
2. Nominal 24 inches [609.6 mm] trace length = 6 inches [152.4 mm] backplane + 2 HmZD or eHSD
3. Nominal 40 inches [1016.0 mm] trace length = 20 inches [508 mm] backplane + 2 HmZD or eHSD
4. Nominal 60 inches [1524.0 mm] trace length = 40 inches [1016 mm] backplane + 2 HmZD or eHSD
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Virtex-6 FPGA GTX Transceivers User Guide
UG366 (v2.5) January 17, 2011
Nominal Trace
Length on FR4
Loss (dB) @
Substrate
2.5 GHz
(inches [mm])
(4)
60 [1524.0]
20.4
TXPREEMPHASIS = 4'b0000.
connectors (trace length neglected) + 18 inches [457.2 mm] on line cards.
connectors (trace length neglected) + 20 inches [508 mm] on line cards.
connectors (trace length neglected) + 20 inches [508 mm] on line cards.
provides DFETAP1 and RXEQMIX settings for 6.25 Gb/s operation for
Nominal Trace
Length on FR4
Loss (dB) @
Substrate
3.125 GHz
(inches [mm])
(2)
24 [609.6]
15.8
(3)
40 [1016.0]
19.9
(4)
60 [1524.0]
25.8
TXPREEMPHASIS = 4'b0000.
connectors (trace length neglected) + 18 inches [457.2 mm] on line cards.
connectors (trace length neglected) + 20 inches [508 mm] on line cards.
connectors (trace length neglected) + 20 inches [508 mm] on line cards.
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TAP1
RXEQMIX = 000
RXEQMIX = 010
10
TAP1
RXEQMIX = 000
RXEQMIX = 010
15
RX Equalizer
RXEQMIX = 110
5
RXEQMIX = 110
10
0
15
5
10
203
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