User guide

When CTLE adaptation is disabled (manual mode), you can select CTLE mode and set CTLE gain

through the Quartus Assignment Editor /.qsf and the Avalon-MM registers.

Supported modes for CTLE:

• Manual Mode:

1. In this mode, manual CTLE values can be set in Assignment Editor/.qsf or using Avalon MM

interface.

• Triggered Adaptation Mode

1. In this adaptation mode, CTLE gain values are controlled by the Adaptive Parametric Tuning

Engine. This mode uses the converged CTLE AC gain values given by the Adaptive Parametric

Tuning Engine.

2. When you use Triggered Adaptation in High Gain mode, Adaptive Parametric Tuning Engine only

gives the converged AC gain value while DC gain still has to be set manually. In high data rate

mode, converged AC gain given by Adaptive Parametric Tuning Engine contains the appropriate

DC gain value.

Note: To know more about how to configure CTLE in different modes, refer to How to Enable CTLE and

DFE.

Related Information

• How to Enable CTLE and DFE on page 5-12

• Arria 10 Device Datasheet

• Arria 10 Register Map

Variable Gain Amplifier (VGA)

Arria 10 channels have a variable gain amplifier to optimize the signal amplitude prior to the CDR

sampling. The VGA is controlled by the Adaptive Parametric Tuning Engine. When VGA adaptation is

disabled, you can select VGA gain through the Quartus Assignment Editor or the Avalon-MM registers.

Figure 5-8: VGA Frequency Response for Different Gain Settings

-4

Magnitude

(dB)

Frequency (Hz)

5-8

Variable Gain Amplifier (VGA)

UG-01143

2015.05.11

Altera Corporation

Arria 10 Transceiver PHY Architecture

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