Direction (mask: KUsbEpDirIn, etc., but used as value).

The number of extra bytes that the standard endpoint descriptor should be extended by. In almost all cases, this should be 0 (zero).

Interval for polling full-speed interrupt and isochronous endpoints. Expressed either directly in milliseconds with a valid range 1..255 (interrupt), or for use as 'value' in the expression interval=2^(value-1) with a valid range 1..16 (isochronous).

Interval for polling high-speed interrupt and isochronous endpoints, or to specify the NAK rate for high-speed control and bulk OUT endpoints. Expressed either for use as 'value' in the expression interval=2^(value-1) with a valid range 1..16 (interrupt and isochronous), or directly as the maximum NAK rate with a valid range 0..255 (control and bulk).

Reserved for future use.

Maximum packet size (literal, no mask).

The number of additional transactions per uframe to be scheduled (0..2) (A value greater than zero is only valid for high-speed high bandwidth interrupt and isochronous endpoints. Also note that there are endpoint size restrictions associated with additional transactions - see 9.6.6.)

Endpoint type (mask: KUsbEpTypeControl, etc., but used as value).