Embedded Systems Design, 2nd Edition

Embedded processors 69

arithmetic is an obvious advantage. The Harvard architecture

reduces the execution time further by allowing simultaneous data

and instruction fetches. The PowerPC can, by virtue of its high

performance, achieve performances suitable for many DSP appli-

cations. The system cost is high involving a multiple chip solution

with very fast memory etc. In applications that need high speed

general processing as well, it can also be a suitable solution. The

ARM 9E processor with its DSP enhanced instructions (essentially

speeded up multiply instructions) can also provide DSP levels of

performance without the need of a DSP.

Another approach ...