Owners manual

Interfaces
H3 Datasheet(Revision1.2) Copyright© 2015 Allwinner Technology Co.,Ltd.All Rights Reserved. Page 514
HcFmRemaining reaches the value specified, processing of the periodic
lists will have priority over Control/Bulk processing. HC will therefore start
processing the Interrupt list after completing the current Control or Bulk
transaction that is in progress.
8.5.2.6.18. HcLSThreshold Register(Default Value: 0x00000628)
Offset: 0x444
Register Name: HcLSThreshold
Bit
Read/Write
Default/Hex
Description
HCD
HC
31:12
Reserved
11:0
R/W
R
0x0628
LSThreshold
This field contains a value which is compared to the FrameRemaining field
prior to initiating a Low Speed transaction. The transaction is started only
if FrameRemaining ³ this field. The value is calculated by
HCD with the consideration of transmission and setup overhead.
8.5.2.6.19. HcRhDescriptorA Register(Default Value: 0x02001201)
Offset: 0x448
Register Name: HcRhDescriptorA
Bit
Read/Write
Default/Hex
Description
HCD
HC
31:24
R/W
R
0x2
PowerOnToPowerGoodTime[POTPGT]
This byte specifies the duration HCD has to wait before accessing a
powered-on port of the Root Hub. It is implementation-specific. The unit
of time is 2 ms. The duration is calculated as POTPGT * 2ms.
23:13
Reserved
12
R/W
R
1
NoOverCurrentProtection
This bit describes how the overcurrent status for the Root Hub ports are
reported. When this bit is cleared, the OverCurrentProtectionMode field
specifies global or per-port reporting.
0
Over-current status is reported collectively for all downstream
ports.
1
No overcurrent protection supported.
11
R/W
R
0
OverCurrentProtectionMode
This bit describes how the overcurrent status for the Root Hub ports are
reported. At reset, these fields should reflect the same mode as
PowerSwitchingMode. This field is valid only if the
NoOverCurrentProtection field is cleared.
0
Over-current status is reported collectively for all downstream
ports.
1
Over-current status is reported on per-port basis.
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