A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 678 / 812
Register Name: PORTSC
Default Value: 0x00002000(w/PPC set to
one);0x00003000(w/PPC set to a zero)
the bit status does not change until the port state actually
changes. There may be a delay in disabling or enabling a port
due to other host controller and bus events.
When the port is disabled, downstream propagation of data is
blocked on this port except for reset.
The default value of this field is ‘0’.
This field is zero if Port Power is zero.
CSC
Connect Status Change
1=Change in Current Connect Status, 0=No change,
Default=0.
Indicates a change has occurred in the port’s Current Connect
Status. The host controller sets this bit for all changes to the
port device connect status, even if system software has not
cleared an existing connect status change. For example, the
insertion status changes twice before system software has
cleared the changed condition, hub hardware will be “setting”
an already-set bit. Software sets this bit to 0 by writing a 1 to it.
This field is zero if Port Power is zero.
CCS
Current Connect Status
Device is present on port when the value of this field is a one,
and no device is present on port when the value of this field is
a zero. This value reflects the current state of the port, and
may not correspond directly to the event that caused the
Connect Status Change(Bit 1) to be set.
This field is zero if Port Power zero.
Note: This register is only reset by hardware or in response to a host controller reset.
6.8.6. OHCI Register List
The Control and Status Partition Register
HcInterruptStatus Register
HcInterruptEnable Register
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