Changing Vod, Pre-Emphasis Using Direct Reconfiguration Flow - Intel Cyclone 10 GX User Manual

6. Reconfiguration Interface and Dynamic Reconfiguration
UG-20070 | 2018.09.24

6.12.1. Changing VOD, Pre-emphasis Using Direct Reconfiguration Flow

1. Perform the necessary steps from steps 1 to 7 in Steps to Perform Dynamic
Reconfiguration.
2. 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.
3. 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.
4. 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.
5. Perform the necessary steps from steps 9 to 12 in Steps to Perform Dynamic
Reconfiguration.
Table 185. Register Map for PMA Analog Feature
PMA Analog Feature
Pre-emphasis 1st post-tap
Pre-emphasis 1st post-tap polarity
Pre-emphasis 2nd post-tap
Pre-emphasis 2nd post-tap polarity
Pre-emphasis 1st pre-tap
Pre-emphasis 1st pre-tap polarity
Pre-emphasis 2nd pre-tap
Pre-emphasis 2nd pre-tap polarity
Differential output voltage (V
The PMA analog settings are governed by a set of rules. Not all combinations of V
and pre-emphasis are valid. The following table lists the maximum pre-emphasis
settings for the corresponding V
Table 186. Valid Maximum (Absolute) Pre-Emphasis Settings
V
OD
31
30
29
28
27
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)
OD
settings.
OD
Maximum (Absolute) Pre-Emphasis Settings
1st Post-Tap 1st Pre-Tap
25
25
25
25
25
Address Bit
0x105 [4:0]
0x105 [6]
0x106 [3:0]
0x106 [5]
0x107 [4:0]
0x107 [5]
0x108 [2:0]
0x108 [4]
0x109 [4:0]
2nd Post-Tap
16 12
16 11
16 10
16 9
16 8
® ®
Intel Cyclone
Values
5'b00000 - 5'b11001
1'b0 = positive
1'b1 = negative
4'b0000 - 4'b1100
1'b0 = positive
1'b1 = negative
5'b00000 - 5'b10000
1'b0 = positive
1'b1 = negative
3'b000 - 3'b111
1'b0 = positive
1'b1 = negative
5'b00000 - 5'b11111
OD
2nd Pre-Tap
7
6
5
4
3
continued...
10 GX Transceiver PHY User Guide
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