SPI master boot. What is the frequency of SCLK1?

Im looking at the Table 45-18: SPI Master Boot BCODE Descriptions in ADSP-SC57x/ADSP-2157x SHARC+ Processor Hardware Reference.

The SPI clock is derived from the SCLK1.

So I wonder how is SCLK1  defined? What frequency is SCLK1?

I'm using a ADSP-SC573 EZ-Board.

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