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NRZ Mode
PAM4 Mode
PRBS23
PRBS23Q
PRBS31
PRBS31Q
User-defined pattern 80-bit
3.1.3. PMA Tuning
The Intel Stratix 10 E-Tile PMA supports various data rates and channel configurations
to meet the most advanced PAM4 and NRZ protocols across a temperature range. The
default adaptation sequence works at a static temperature regardless of the load.
For certain protocols, the adaptation sequence may not yield optimal performance
over the temperature sweep. When temperature increases, the signal quality at the
sampler degrades and the vertical and horizontal eye opening at the sampler degrade.
To compensate for these degradations, RX AFE parameters and decision feedback
equalization (DFE) must be positioned so that the adaptation results in an optimal
performance with environmental changes.
PMA tuning methodology optimizes link performance to reduce the bit error rate
(BER).
3.1.3.1. Purpose of PMA Tuning
You can see the value of PMA tuning by considering the following two cases:
•
Case 1—Optimum link performance measure by executing initial adaptation at
static (minimum and maximum) temperatures
•
Case 2—Optimum link performance for a temperature sweep (real time dynamic
temperature condition) may not be achieved with initial adaptation and continuous
adaptation.
Figure 37.
Case 1: Static Temperature
When initial adaptation is initiated at both low and high temperature (static temperature cases) it results in
relatively low BER at both the temperatures.
Temp
Initial
Adaptation
Initial
Adaptation
BER
3. Intel Stratix 10 E-Tile Transceiver PHY Architecture
UG-20056 | 2019.02.04
Intel
®
Stratix
®
10 E-Tile Transceiver PHY User Guide
68