10.2. Fastbus Extension

Using the fastbus extension, the ARM720T has a single input clock, BCLK. This is used to clock the internals of the device, and qualified by BWAIT, controls the memory interface:

Figure 10.1. Conceptual device clocking using the fastbus extension

When operating the device with FASTBUS HIGH, the inputs FCLK and SnA are not used.

Note

To prevent unwanted power dissipation, ensure that they do not float to an undefined level. New designs should tie these signals LOW for compatibility with future products.

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