Visible to Intel only — GUID: mcn1423211244989
Ixiasoft
Visible to Intel only — GUID: mcn1423211244989
Ixiasoft
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.
Cyclone® 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|.
Exceptions for PCIe* Gen2 design:
- VOD setting = 50 and pre-emphasis setting = 22 are allowed for PCIe* Gen2 design with transmit de-emphasis –6dB setting (pipe_txdeemp = 1’b0) using Intel® PCIe* Hard IP and PIPE IP cores.
- VOD setting = 50 and pre-emphasis setting = 12 are allowed for PCIe* Gen2 design with transmit de-emphasis –3.5dB setting (pipe_txdeemp = 1’b1) using Intel® PCIe* Hard IP and PIPE IP cores.
For example, when VOD = 800 mV, the corresponding VOD value setting is 40. The following conditions show that the 1st post tap pre-emphasis setting = 2 is valid:
- |B| + |C| ≤ 60→ 40 + 2 = 42
- |B| – |C| > 5→ 40 – 2 = 38
- (VMAX/VMIN – 1)% < 600%→ (42/38 – 1)% = 10.52%
To predict the pre-emphasis level for your specific data rate and pattern, run simulations using the Cyclone® V HSSI HSPICE models.
Intel® Quartus® Prime 1st Post Tap Pre-Emphasis Setting | Intel® Quartus® Prime VOD Setting | Unit | ||||||
---|---|---|---|---|---|---|---|---|
10 (200 mV) | 20 (400 mV) | 30 (600 mV) | 35 (700 mV) | 40 (800 mV) | 45 (900 mV) | 50 (1000 mV) | ||
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | dB |
1 | 1.97 | 0.88 | 0.43 | 0.32 | 0.24 | 0.19 | 0.13 | dB |
2 | 3.58 | 1.67 | 0.95 | 0.76 | 0.61 | 0.5 | 0.41 | dB |
3 | 5.35 | 2.48 | 1.49 | 1.2 | 1 | 0.83 | 0.69 | dB |
4 | 7.27 | 3.31 | 2 | 1.63 | 1.36 | 1.14 | 0.96 | dB |
5 | — | 4.19 | 2.55 | 2.1 | 1.76 | 1.49 | 1.26 | dB |
6 | — | 5.08 | 3.11 | 2.56 | 2.17 | 1.83 | 1.56 | dB |
7 | — | 5.99 | 3.71 | 3.06 | 2.58 | 2.18 | 1.87 | dB |
8 | — | 6.92 | 4.22 | 3.47 | 2.93 | 2.48 | 2.11 | dB |
9 | — | 7.92 | 4.86 | 4 | 3.38 | 2.87 | 2.46 | dB |
10 | — | 9.04 | 5.46 | 4.51 | 3.79 | 3.23 | 2.77 | dB |
11 | — | 10.2 | 6.09 | 5.01 | 4.23 | 3.61 | — | dB |
12 | — | 11.56 | 6.74 | 5.51 | 4.68 | 3.97 | — | dB |
13 | — | 12.9 | 7.44 | 6.1 | 5.12 | 4.36 | — | dB |
14 | — | 14.44 | 8.12 | 6.64 | 5.57 | 4.76 | — | dB |
15 | — | — | 8.87 | 7.21 | 6.06 | 5.14 | — | dB |
16 | — | — | 9.56 | 7.73 | 6.49 | — | — | dB |
17 | — | — | 10.43 | 8.39 | 7.02 | — | — | dB |
18 | — | — | 11.23 | 9.03 | 7.52 | — | — | dB |
19 | — | — | 12.18 | 9.7 | 8.02 | — | — | dB |
20 | — | — | 13.17 | 10.34 | 8.59 | — | — | dB |
21 | — | — | 14.2 | 11.1 | — | — | — | dB |
22 | — | — | 15.38 | 11.87 | — | — | — | dB |
23 | — | — | — | 12.67 | — | — | — | dB |
24 | — | — | — | 13.48 | — | — | — | dB |
25 | — | — | — | 14.37 | — | — | — | dB |
26 | — | — | — | — | — | — | — | dB |
27 | — | — | — | — | — | — | — | dB |
28 | — | — | — | — | — | — | — | dB |
29 | — | — | — | — | — | — | — | dB |
30 | — | — | — | — | — | — | — | dB |
31 | — | — | — | — | — | — | — | dB |