Intel® Arria® 10 Core Fabric and General Purpose I/Os Handbook

ID 683461
Date 9/29/2022
Public
Document Table of Contents

7.3.2. CLKUSR

You can use CLKUSR pin as the clock source for Intel® Arria® 10 device configuration and initialization. CLKUSR pin can also be used for configuration and transceiver calibration simultaneously.

For transceiver calibration, CLKUSR must be a free-running clock running between 100 MHz to 125 MHz at power-up depending on the device’s configuration scheme as shown in the following table. Transceiver calibration starts utilizing the CLKUSR during device configuration and may continue to use it even when the device enters user mode.
Note: CLKUSR cannot be used as the reference clock for PLL.
Table 96.  Available Configuration Clock Source and Transceiver Calibration CLKUSR Frequency for Intel® Arria® 10 Devices
Configuration Scheme Supported Clock Source for Device Configuration Supported Clock Source for Device Initialization Supported CLKUSR Frequency for Transceiver Calibration
AS Internal Oscillator Internal Oscillator 100 to 125 MHz
CLKUSR CLKUSR 100 MHz
PS DCLK only Internal Oscillator, CLKUSR, DCLK 100 to 125 MHz
FPP (x8, x16, x32)

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