Visible to Intel only — GUID: mta1443050100899
Ixiasoft
Visible to Intel only — GUID: mta1443050100899
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 Arria® 10 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. Please refer to Arria® 10 Pre-Emphasis and Output Swing Settings for current valid settings. Also, refer to "Analog Parameter Settings" and setup guidelines on post_tap polarity settings.