User guide

PMA Analog Feature Address Bit Values
Pre-emphasis 1
st
pre-tap polarity 0x107 [5]
1'b0 = positive
1'b1 = negative
Pre-emphasis 2
nd
pre-tap 0x108 [2:0]
3'b000 - 3'b111
Pre-emphasis 2
nd
pre-tap polarity 0x108 [4]
1'b0 = positive
1'b1 = negative
Differential output voltage (V
OD
) 0x109 [4:0]
5'b00000 - 5'b11111
The PMA analog settings are governed by a set of rules. Not all combinations of V
OD
and pre-emphasis
are valid. The following table lists the valid maximum pre-emphasis settings for the corresponding V
OD
settings.
Table 6-6: Valid Maximum Pre-Emphasis Settings
V
OD
Maximum 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
6-14
Changing PMA Analog Parameters
UG-01143
2015.05.11
Altera Corporation
Reconfiguration Interface and Dynamic Reconfiguration
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