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DSP56001A
Host Port Considerations
MOTOROLA
DSP56001A/D, Rev. 1
4-9
DSP Programming Considerations
SYNCHRONIZATION OF STATUS BITS FROM HOST TO DSP
DMA, HF1, HF0, and HCP, HTDE, and HRDF status bits are set or cleared by the host processor
side of the interface. These bits are individually synchronized to the DSP clock. (Refer to the
User’s Manual for descriptions of these status bits.)
READING HF0 AND HF1 AS AN ENCODED PAIR
Care must be exercised when reading status bits HF0 and HF1 as an encoded pair, because the
four combinations (00, 01, 10, and 11) each have significance. A very small probability exists that
the DSP will read the status bits during transition. Therefore, HF0 and HF1 should be read twice
and checked for consensus.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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