Public Version
High-Speed USB Host Subsystem
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Bits
Field Name
Description
Type
Reset
0x01: 1 microframe
0x02: 2 microframes
0x04: 4 microframes
0x08: 8 microframes (default, equates to 1 ms)
0x10: 16 microframes (2 ms)
0x20: 32 microframes (4 ms)
0x40: 64 microframes (8 ms)
Others: Undefined
15:12
RESERVED
Reserved
R
0x0
11
ASPME
Asynchronous Schedule Park Mode Enable
RW
1
0x0: Park mode is disabled.
0x1: Park mode is enabled.
10
RESERVED
Reserved
R
0
9:8
ASPMC
Asynchronous Schedule Park Mode Count
RW
0x3
It contains a count of the number of successive
transactions the host controller is allowed to execute from
a high-speed queue head on the asynchronous schedule
before continuing traversal of the asynchronous
schedule.
Valid values are 0x1 to 0x3. The software must not write
a 0 to this bit when Park Mode Enable is a 1 as this may
result in undefined behavior.
7
LHCR
Light Host Controller Reset
RW
0
It allows the driver to reset the EHCI controller without
affecting the state of the ports or the relationship to the
companion host controllers.
Read 0x0: Light host controller reset is complete and it is
safe for host software to reinitialize the host controller.
Read 0x1: Light host controller reset is still ongoing.
6
IAAD
Interrupt on Async Advance Doorbell
RW
0
This bit is used as a doorbell by software to tell the host
controller to issue an interrupt the next time it advances
asynchronous schedule.
Write 0x1: Ring the doorbell.
Software should not write a 1 to this bit when the
asynchronous schedule is disabled. Doing so may yield
undefined results.
5
ASE
Asynchronous Schedule Enable
RW
0
This bit controls whether the host controller skips
processing the asynchronous schedule.
0x0: Do not process the asynchronous schedule
0x1: Use the USBHOST.
register to
access the asynchronous schedule.
4
PSE
Periodic Schedule Enable
RW
0
This bit controls whether the host controller skips
processing the periodic schedule.
0x0: Do not process the periodic schedule
0x1: Use the USBHOST.
register to
access the periodic schedule.
3:2
FLS
Frame List Size
RW
0
This field specifies the size of the frame list. The size of
the frame list controls which bits in the frame index
register should be used for the frame list vurrent index.
0x0: 1024 elements (4096 bytes)
0x1: 512 elements (2048 bytes)
3348
High-Speed USB Host Subsystem and High-Speed USB OTG Controller
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
Страница 174: ...174 List of Tables SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 692: ...692 MPU Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1084: ...1084 IVA2 2 Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1990: ...1990 2D 3D Graphics Accelerator SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2334: ...2334 Memory Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2700: ...2700 Memory Management Units SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2868: ...2868 HDQ 1 Wire SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2974: ...2974 UART IrDA CIR SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3054: ...3054 Multichannel SPI SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3462: ...3462 MMC SD SDIO Card Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3508: ...3508 General Purpose Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3584: ...3584 Initialization SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3648: ...3648 Debug and Emulation SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...