Visible to Intel only — GUID: qiw1486507538098
Ixiasoft
Visible to Intel only — GUID: qiw1486507538098
Ixiasoft
6.12.1. Changing VOD, Pre-emphasis Using Direct Reconfiguration Flow
- Perform the necessary steps from steps 1 to 7 in Steps to Perform Dynamic Reconfiguration.
- Read from the PMA analog feature address of the channel you want to change. For example, to change pre-emphasis 1st post-tap, read and store the value of address 0x105.
- Select a valid value for the feature according to the Cyclone® 10 GX register map. For example, a valid setting for pre-emphasis 1st post-tap has a bit encoding of 5'b00001.
- Perform a read-modify-write to the address of the PMA analog feature using the valid value. For example, to change the pre-emphasis 1st post-tap, write 5'b00001 to address 0x105.
- Perform the necessary steps from steps 9 to 12 in Steps to Perform Dynamic Reconfiguration.
PMA Analog Feature | Address | Bit | Values |
---|---|---|---|
Pre-emphasis 1st post-tap | 0x105 | [4:0] | 5'b00000 - 5'b11001 |
Pre-emphasis 1st post-tap polarity | 0x105 | [6] | 1'b0 = positive 1'b1 = negative |
Pre-emphasis 2nd post-tap | 0x106 | [3:0] | 4'b0000 - 4'b1100 |
Pre-emphasis 2nd post-tap polarity | 0x106 | [5] | 1'b0 = positive 1'b1 = negative |
Pre-emphasis 1st pre-tap | 0x107 | [4:0] | 5'b00000 - 5'b10000 |
Pre-emphasis 1st pre-tap polarity | 0x107 | [5] | 1'b0 = positive 1'b1 = negative |
Pre-emphasis 2nd pre-tap | 0x108 | [2:0] | 3'b000 - 3'b111 |
Pre-emphasis 2nd pre-tap polarity | 0x108 | [4] | 1'b0 = positive 1'b1 = negative |
Differential output voltage (VOD) | 0x109 | [4:0] | 5'b00000 - 5'b11111 |
The PMA analog settings are governed by a set of rules. Not all combinations of VOD and pre-emphasis are valid. The following table lists the maximum pre-emphasis settings for the corresponding VOD settings.
VOD | Maximum (Absolute) Pre-Emphasis Settings | |||
---|---|---|---|---|
1st Post-Tap | 1st Pre-Tap | 2nd Post-Tap | 2nd Pre-Tap | |
31 | 25 | 16 | 12 | 7 |
30 | 25 | 16 | 11 | 6 |
29 | 25 | 16 | 10 | 5 |
28 | 25 | 16 | 9 | 4 |
27 | 25 | 16 | 8 | 3 |
26 | 25 | 16 | 7 | 2 |
25 | 25 | 16 | 6 | 1 |
24 | 25 | 16 | 5 | 0 |
23 | 24 | 16 | 4 | 0 |
22 | 23 | 16 | 3 | 0 |
21 | 22 | 16 | 2 | 0 |
20 | 21 | 16 | 1 | 0 |
19 | 20 | 16 | 0 | 0 |
18 | 19 | 15 | 0 | 0 |
17 | 18 | 14 | 0 | 0 |
16 | 17 | 13 | 0 | 0 |
15 | 16 | 12 | 0 | 0 |
14 | 15 | 11 | 0 | 0 |
13 | 14 | 10 | 0 | 0 |
12 | 13 | 9 | 0 | 0 |
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