Allwinner A20 - Page 660

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6.8.5.2. EHCI HOST INTERFACE VERSION NUMBER REGISTER
Offset: 0x02
Register Name: HCIVERSION
Default Value:0x0100
Bit
Read/Write
Default
Description
15:0
R
0x0100
HCIVERSION
This is a 16-bits register containing a BCD encoding of the
EHCI revision number supported by this host controller. The
most significant byte of this register represents a major
revision and the least significant byte is the minor revision.
6.8.5.3. EHCI HOST CONTROL STRUCTURAL PARAMETER REGISTER
Offset: 0x04
Register Name: HCSPARAMS
Default Value: Implementation Dependent
Bit
Read/Write
Default
Description
31:24
/
0
Reserved
These bits are reserved and should be set to zero.
23:20
R
0
/
19:16
/
0
Reserved.
These bits are reserved and should be set to zero.
15:12
R
0
N_CC
Number of Companion Controller (N_CC)
This field indicates the number of companion controllers
associated with this USB2.0 host controller. A zero in this field
indicates there are no companion host controllers. And a value
larger than zero in this field indicates there are companion
USB1.1 host controller(s).
This field will always be ‘0’.
11:8
R
0
N_PCC
Number of Port per Companion Controller(N_PCC)
This field indicates the number of ports supported per
companion host controller host controller. It is used to indicate
the port routing configuration to system software.
This field will always fix with ‘0’.
7
R
0
PRR
Port Routing Rules
This field indicates the method used by this implementation for