In the C54X series, only 542, 545, 548 and 549 provide a standard 8-bit HPI interface, while the C54XX series provides an 8-bit or 16-bit enhanced HPI interface. The external host or main processor can read and write the C54X\'s on-chip RAM through the HPI interface, thereby greatly improving the data exchange capability. In the standard HPI interface, the external host can only access the 2K-sized on-chip RAM at a fixed location, while the enhanced HPI interface can access the entire internal RAM. This experiment uses the HPI interface provided by DES to learn the design and use of the HPI interface. The C language source program file name for this experiment is 5402pp.c.
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