This appnote introduces the "flow state" feature to the GPIF. The motivation behind this feature was to extend GPIF to handle ATAPI UDMA. It was therefore created with UDMA in mind, but is not limited to UDMA. By covering UDMA as a subset of its capabilities, the likelihood of capturing other bus protocols is heightened, giving it a value and lifetime that extends beyond just UDMA. This is in keeping with the basic philosophy of GPIF.
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