ARM920T has two clock inputs, BCLK and FCLK. From the output of GPCLK, we can see that ARM920T is driven by GCLK clock mode. The nF bit and iA bit of CP15 register 1 determine the clock mode, that is, whether FCLK is generated by GCLK or BCLK. There are three clock modes, namely fast bus, synchronous and asynchronous.
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