Device Configuration User Guide Agilex™ 3 FPGAs and SoCs

ID 847422
Date 5/23/2025
Public
Document Table of Contents

3.2.8. AS_CLK

The Agilex™ 3 device drives AS_CLK to the serial flash device. An internal oscillator or the external clock that drives the OSC_CLK_1 pin generates AS_CLK. Using an external clock source allows the AS_CLK to run at a higher frequency. If you provide a 25 MHz, 100 MHz, or 125 MHz clock to the OSC_CLK_1 pin, the AS_CLK can run up to 166 MHz.

Set the maximum required frequency for the AS_CLK pin in the Quartus® Prime software as described in Active Serial Configuration Software Settings. The AS_CLK pin runs at or below your selected frequency.

Table 38.  Supported Configuration Clock Source and AS_CLK Frequencies in Agilex™ 3 DevicesThe table displays valid AS_CLK settings for the respective configuration clock source.
Configuration Clock Source AS_CLK Frequency (MHz)
Internal oscillator

25

58

77

115

OSC_CLK_1 16 (25/100/125 MHz)

25

50

71.5

100

125

166

Note: The configuration fails if the firmware receives bitstream with an invalid AS_CLK setting.
16 For Agilex™ 3 devices with speed grade -7, the clock speed for configuration network runs at 200 MHz when using OSC_CLK_1 and only supports AS_CLK at frequencies of 25 MHz, 50 MHz, and 100 MHz.