9.3.6.22 Polling Intervals for Transfer Types

Table 9-44. Polling Intervals for Transfer Types
Transfer Type	Speed	Valid Value (m)	Interpretation
Interrupt	Low speed or full speed	1 – 255	Polling interval is m frames.
Interrupt	High speed	1 – 16	Polling interval is 2(m – 1) microframes.
Isochronous	Full speed or high speed	1 – 16	Polling interval is 2(m –1) frames/microframes.
Bulk	Full speed or high speed	2 – 16	NAK Limit is 2(m – 1) frames/microframes. A value of 0 or 1 disables the NAK timeout function.

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