307013-003 Datasheet, PDF (562/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

EHCI Controller Registers (D29:F7)
13.2.1.2
HCIVERSION—Host Controller Interface Version Number
Register
Offset:
MEM_BASE + 02h–03h
Default Value: 0100h
Attribute:
Size:
RO
16 bits
13.2.1.3
Note:
Bit
Description
15:0
Host Controller Interface Version Number — RO. This is a two-byte register containing a
BCD encoding of the version number of interface that this host controller interface
conforms.
HCSPARAMS—Host Controller Structural Parameters
Offset:
MEM_BASE + 04h–07h
Default Value: 00104208h
Attribute:
Size:
R/W (special), RO
32 bits
This register is reset by a suspend well reset and not a D3-to-D0 reset or HCRESET.
Bit
Description
31:24 Reserved — RO. Default=0h.
23:20
Debug Port Number (DP_N) — RO (special). Hardwired to 1h indicating that the Debug
Port is on the lowest numbered port on the Intel^® ICH7.
19:16 Reserved
15:12
Number of Companion Controllers (N_CC) — R/W (special). This field indicates the
number of companion controllers associated with this USB EHCI host controller.
A 0 in this field indicates there are no companion host controllers. Port-ownership hand-
off is not supported. Only high-speed devices are supported on the host controller root
ports.
A value of 1 or more in this field indicates there are companion USB UHCI host
controller(s). Port-ownership hand-offs are supported. High, Full- and Low-speed
devices are supported on the host controller root ports.
The ICH7 allows the default value of 4h to be over-written by BIOS. When removing
classic controllers, they should be disabled in the following order: Function 3, Function
2, Function 1, and Function 0, which correspond to ports 7:6, 5:4, 3:2, and 1:0,
respectively.
11:8
Number of Ports per Companion Controller (N_PCC) — RO. Hardwired to 2h. This field
indicates the number of ports supported per companion host controller. It is used to
indicate the port routing configuration to system software.
7:4 Reserved. These bits are reserved and default to 0.
N_PORTS — R/W (special). 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
3:0 _{range of 1h to Fh.}
The ICH7 reports 8h by default. However, software may write a value less than 8 for
some platform configurations. A 0 in this field is undefined.
NOTE: This register is writable when the WRT_RDONLY bit is set.
562
Intel ^® ICH7 Family Datasheet