AN 981: Using Generic QSPI Flash on SDM Devices

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ID 778053
Date 4/21/2025
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3.3. Maximum QSPI Clock

You can set various AS_CLK frequency in your Quartus Project, the supported AS_CLK frequencies have dependency on your configuration clock source. Refer to the following table for supported AS_CLK frequencies.

Table 2.  Support AS_CLK Frequency for the Respective Configuration Clock Source
Configuration Clock Source AS_CLK Frequency (MHz)
Internal Oscillator 25
58
77
115
OSC_CLK_1 (25/100/125 MHz) 25
50
71.5
100
125
166

You need to make sure the AS_CLK frequency setting is less than the maximum supported QSPI clock frequency published in the QSPI flash device datasheet.

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