6.3.3. Component functionality

The ATB upsizer attempts to make efficient use of the increased width of the master ATB interface, by combining multiple cycles of trace on the slave interface into a single cycle of trace on the master interface.

The upsizer implements an internal buffer which stores trace data on the slave interface to form the transfer to be output on the master interface. The FIFO contents are output on the master interface when:

To ensure maximum efficiency of the upsizer, trace sources must aim to use the full width of the ATB bus wherever possible.

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