Xilinx Virtex-6 FPGA User Manual page 202
Gtx transceivers
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Chapter 4: Receiver
Table 4-17: DFETAP1 and RXEQMIX at 3.125 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 4-18
backplane applications.
Table 4-18: DFETAP1 and RXEQMIX at 4.25 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
Table 4-19
applications.
Table 4-19: DFETAP1 and RXEQMIX at 5 Gb/s for Backplane Applications
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202
Nominal Trace
Length on FR4
Loss (dB) @
Substrate
1.5625 GHz
(inches [mm])
(4)
60 [1524.0]
13.6
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 4.25 Gb/s operation for
Nominal Trace
Length on FR4
Loss (dB) @
Substrate
2.125 GHz
(inches [mm])
(2)
24 [609.6]
9.9
(3)
40 [1016.0]
12.7
(4)
60 [1524.0]
17.2
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 5 Gb/s operation for backplane
Nominal Trace
Length on FR4
Loss (dB) @
Substrate
2.5 GHz
(inches [mm])
(2)
24 [609.6]
12.2
(3)
40 [1016.0]
15.1
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TAP1
RXEQMIX = 000
RXEQMIX = 010
0
TAP1
RXEQMIX = 000
RXEQMIX = 010
5
TAP1
RXEQMIX = 000
RXEQMIX = 010
Virtex-6 FPGA GTX Transceivers User Guide
RXEQMIX = 110
0
RXEQMIX = 110
0
0
5
0
5
RXEQMIX = 110
0
0
10
0
UG366 (v2.5) January 17, 2011
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