Intel® Agilex™ Configuration User Guide

ID 683673
Date 5/30/2022

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3.2.3. AS Using Multiple Serial Flash Devices

Intel® Agilex™ devices support one AS x4 flash memory device for AS configuration and up to three AS x4 flash memories for use with HPS data storage. The MSEL pins operate as MSEL only during POR state. After SDM samples the MSEL pins during the boot ROM state for AS x4 mode, the SDM repurposes the MSEL pins as chip select pins. You must to ensure appropriate chip select pin connections to the configuration AS x4 flash memory and the HPS AS x4 flash memory. Each flash device has a dedicated AS_nCSO pin but shares other pins.

Figure 39. Connections for AS Configuration with Multiple Serial Flash Devices

The following table shows the maximum supported AS_CLK frequency for a range of capacitance loading values when using multiple flash devices. The maximum AS_CLK frequency also depends on whether you use the OSC_CLK_1 or internal oscillator as the clock source.

Table 33.  Maximum AS_CLK Frequency as a Function of Board Capacitance Loading and Clock SourceThis table is preliminary.
Capacitance Loading (pF) Maximum Supported AS_CLK (MHz)
OSC_CLK_1 (MHz) Internal Oscillator (MHz)
10 166/125 115
30 100 77
37 71.5 77
80 50 58
140 25 25