Public Version
www.ti.com
High-Speed USB Host Subsystem
Bits
Field Name
Description
Type
Reset
31:14
RESERVED
Reserved
R
0x00000
13:0
PS
Periodic start. The host controller driver must program
RW
0x0000
this value to be about 10% less than the frame interval
field value 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 22-197. Register Call Summary for Register HCPERIODICSTART
High-Speed USB Host Subsystem
•
High-Speed USB Host Subsystem Register Summary
Table 22-198. HCLSTHRESHOLD
Address Offset
0x0000 0044
Physical Address
0x4806 4444
Instance
OHCI
Description
HC Low-Speed Threshold Register
Type
RW
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
RESERVED
LST
Bits
Field Name
Description
Type
Reset
31:12
RESERVED
Reserved
R
0x00000
11:0
LST
Low-speed threshold.
RW
0x628
Table 22-199. Register Call Summary for Register HCLSTHRESHOLD
High-Speed USB Host Subsystem
•
High-Speed USB Host Subsystem Register Summary
Table 22-200. HCRHDESCRIPTORA
Address Offset
0x0000 0048
Physical Address
0x4806 4448
Instance
OHCI
Description
HC Root Hub A Register
Type
RW
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
POTPG
RESERVED
NDP
DT
NPS
PSM
NOCP
OCPM
Bits
Field Name
Description
Type
Reset
31:24
POTPG
Power-on to power-good time. Defines the minimum
RW
0x0A
amount of time (2 ms * POTPG) between the USB host
controller turning on power to a downstream port and
when the USB host can access the downstream device.
23:13
RESERVED
Reserved
R
0x000
12
NOCP
No overcurrent protection.
RW
0
0x0: Overcurrent status is reported collectively for all
downstream ports.
0x1: The USB host controller does not implement
overcurrent protection inputs
Note: The bit must not be used, and is always written to
with its default (reset) value as the hardware overcurrent
inputs are tied off at device level.
3337
SWPU177N – December 2009 – Revised November 2010
High-Speed USB Host Subsystem and High-Speed USB OTG Controller
Copyright © 2009–2010, Texas Instruments Incorporated