Intel® Agilex™ Hard Processor System Technical Reference Manual

ID 683567
Date 11/11/2022
Public

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11.3.7. Security

The clock manager creates a boot clock as the clock reference for boot mode and external bypass. The clock configuration is based on security features in the Secure Device Manager (SDM).

The following table defines the boot clock sources.

Table 100.  Security Input Clocks
Clock Name Source Description
HPS_OSC_CLK Pin External Oscillator Clock Reference. Non-secure clock reference.
cb_intosc_clk HPS

Control Block high speed internal ring oscillator. This clock has wide variation across process/temperature.

This clock is used as the secure reference for Boot Mode. Because the range/jitter of the clock is low quality, the clock is divided by 2.