AV-51002
2015.12.16
1-38
Transmitter Pre-Emphasis Levels
Symbol
VOD Setting(58)
VOD Value (mV)
VOD Setting(58)
VOD Value (mV)
1060
25
26
27
28
29
30
31
32
33
500
520
540
560
580
600
620
640
660
53
54
55
56
57
58
59
60
1080
1100
1120
1140
1160
1180
1200
Transmitter Pre-Emphasis Levels
The following table lists the simulation data on the transmitter pre-emphasis levels in dB for the first post tap under the following conditions:
• Low-frequency data pattern—five 1s and five 0s
• Data rate—2.5 Gbps
The levels listed are a representation of possible pre-emphasis levels under the specified conditions only and the pre-emphasis levels may change
with data pattern and data rate.
Arria V devices only support 1st post tap pre-emphasis with the following conditions:
• The 1st post tap pre-emphasis settings must satisfy |B| + |C| ≤ 60 where |B| = VOD setting with termination value, RTERM = 100 Ω and |C| = 1st
post tap pre-emphasis setting.
• |B| – |C| > 5 for data rates < 5 Gbps and |B| – |C| > 8.25 for data rates > 5 Gbps.
• (VMAX/VMIN – 1)% < 600%, where VMAX = |B| + |C| and VMIN = |B| – |C|.
Exception for PCIe Gen2 design: VOD setting = 43 and pre-emphasis setting = 19 are allowed for PCIe Gen2 design with transmit de-emphasis –
6dB setting (pipe_txdeemp= 1’b0) using Altera PCIe Hard IP and PIPE IP cores.
(58)
(59)
Convert these values to their binary equivalent form if you are using the dynamic reconfiguration mode for PMA analog controls.
Only valid for data rates ≤ 5 Gbps.
Arria V GX, GT, SX, and ST Device Datasheet
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