Hc Periodic Start Register (Hcperiodicstart); Hc Periodic Start Register (Hcperiodicstart) Field Descriptions - Texas Instruments TMS320C6747 DSP User Manual

Registers

3.17 HC Periodic Start Register (HCPERIODICSTART)

The HC periodic start register (HCPERIODICSTART) defines the position within the USB frame where
endpoint descriptors (EDs) on the periodic list have priority over EDs on the bulk and control lists.
HCPERIODICSTART is shown in
31
15 14 13
Reserved
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 18. HC Periodic Start Register (HCPERIODICSTART) Field Descriptions
Bit Field Value
31-14 Reserved
13-0 PS 0-3FFFh
26 Universal Serial Bus OHCI Host Controller
Figure 18 and described in
Figure 18. HC Periodic Start Register (HCPERIODICSTART)
Description
0 Reserved
Periodic start. The host controller driver must program this value to be about 10% less than the
frame interval (FI) value in the HC frame interval register (HCFMINTERVAL), so that control and
bulk EDs have priority for the first 10% of the frame; then periodic EDs have priority for the
remaining 90% of the frame.
Table 18.
Reserved
R-0
PS
R/W-0
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16
0
SPRUFM8 – June 2009
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