Allwinner A20 - Page 661

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Offset: 0x04
Register Name: HCSPARAMS
Default Value: Implementation Dependent
Bit
Read/Write
Default
Description
how all ports are mapped to companion controllers. The value
of this field has the following interpretation:
Valu
e
Meaning
0
The first N_PCC ports are routed to the lowest
numbered function companion host controller, the
next N_PCC port are routed to the next lowest
function companion controller, and so on.
1
The port routing is explicitly enumerated by the first
N_PORTS elements of the HCSP-PORTTOUTE
array.
6:4
/
0
Reserved.
These bits are reserved and should be set to zero.
3:0
R
1
N_PORTS
This field specifies the number of physical downstream ports
implemented on this host controller. The value of this field
determines how many port registers are addressable in the
Operational Register Space. Valid values are in the range of
0x1 to 0x0f.
This field is always 1.
6.8.5.4. EHCI HOST CONTROL CAPABILITY PARAMETER REGISTER
Offset: 0x08
Register Name: HCCPARAMS
Default Value: Implementation Dependent
Bit
Read/Write
Default
Description
31:16
/
0
Reserved
These bits are reserved and should be set to zero.
15:18
R
0
EECP
EHCI Extended Capabilities Pointer (EECP)
This optional field indicates the existence of a capabilities list.
A value of 00b indicates no extended capabilities are
implemented. A non-zero value in this register indicates the
offset in PCI configuration space of the first EHCI extended
capabiliby. The pointer value must be 40h or greater if
implemented to maintain to consistency of the PCI header
defined for this calss of device.
The value of this field is always ‘00b’.