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Intel Stratix 10 Device Family Pin Connection Guidelines
3.1.2.1.2. RX Adaptation Modes
The Intel Stratix 10 E-Tile supports the initial and continuous adaptation modes.
Table 29.
Intel Stratix 10 E-Tile Receiver PMA RX Adaptation Modes
Mode
Description
Initial adaptation
During initial adaptation, the adaptation engine adapts all of the RX analog front
end (AFE) parameters to optimize the receiver eye opening and adjusts the vertical
and horizontal sampling location accordingly.
• This mode calibrates the PMA to known good settings.
• It is disruptive tuning and impacts the data traffic.
• All channels can be configured in initial adaptation mode simultaneously.
Run initial adaptation under either of the following conditions:
• On device power up. Refer to PMA Bring Up Flow for more detail.
• When there is change in the physical channel between TX and RX. For example,
during debug when you use different loss medium links.
• During debug, when you switch from internal or serial loopback enable to
internal or serial loopback disable mode and the BER readout is exceptionally
high, Intel recommends that you issue a PMA reset followed by loopback mode
and initial adaptation.
Continuous adaptation
The goal of this adaptation is to maintain the signal quality at the sampler close to
the initial adaptation over time and temperature.
• This mode is run only after running initial adaptation during the device bring up.
• This mode tracks the temperature over time by continuously adapting new
values of the RX AFE parameters.
• This mode is a continuous and non-disruptive process, that is, it does not impact
the data traffic.
• During a link debug process with the hard PRBS generator and verifier, you
cannot read out accumulated errors from the error counter unless you stop
continuous adaptation. Details on PMA code and value to stop continuous
adaptation are available in the PMA Register Map.
For more details on Register Read/Write support and programming, refer to PMA
Receiver Equalization Adaptation Usage Model and 0x000A: Receiver Tuning Controls
to configure these parameters.
The following table lists all the PMA parameters that you can manually optimize before
triggering initial adaptation and continuous adaptation. Refer to PMA AVMM Registers
and PMA Receiver Equalization Adaptation Usage Model to understand how the
parameter can be fixed such that it is not overwritten by the adaptation engine. If you
do not fix the parameter, the adaptation engine adapts the parameter to the required
value.
Table 30.
PMA Parameter Description and Range
Some of these parameters are tunable during initial adaptation and continuous adaptation. To avoid getting an
optimized parameter overwritten by the adaptation tuning engine, you must fix the parameter.
Parameter
Min
Max Initial Adaptation
Continuous
Adaptation
Manual
Optimization
Possible
Firmware
Default
GainLF
0
15
Yes
Yes
Yes
8
CTLE LF Min
0
15
N/A
N/A
N/A
0
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3. Intel Stratix 10 E-Tile Transceiver PHY Architecture
UG-20056 | 2019.02.04
Intel
®
Stratix
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10 E-Tile Transceiver PHY User Guide
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