FW82801DBM S L6DN Intel, FW82801DBM S L6DN Datasheet - Page 454

• Manufacturer Part Number: FW82801DBM S L6DN
• Manufacturer: Intel

Specifications of FW82801DBM S L6DN

• Lead Free Status / RoHS Status: Not Compliant

EHCI Controller Registers (D29:F7)
12.2.1.2
12.2.1.3
454
Note: This register is reset by a suspend well reset and not a D3-to-D0 reset or HCRESET.
HCIVERSION—Host Controller Interface Version Number Register
Offset:
Default Value:
HCSPARAMS—Host Controller Structural Parameters Register
Offset:
Default Value:
NOTE: This register is writable when the WRT_RDONLY bit is set.
31:24
23:20
19:17
15:12
15:0
11:8
7:4
3:0
Bit
Bit
16
This is a two-byte register containing a BCD encoding of the version number of interface that this
host controller interface conforms.
Reserved — RO. Default=0h.
Debug Port Number (DP_N) — R/W-Special. Hardwired to 1h; indicates that the Debug Port is on
the lowest numbered port on the ICH4.
Reserved
Reserved. Should be written to 0.
Number of Companion Controllers (N_CC) — R/W-Special. This field indicates the number of
companion controllers associated with this USB ECHI host controller.
A 0h 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 larger than 1 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 ICH4 allows the default value of 3h to be over-written by BIOS. Since the ICH4 cannot support
more than 3 companion host controllers, bits 15:14 are implemented as read-only 00b. When
removing classic controllers, they should be disabled in the following order: Function 2, Function 1,
and Function 0, which correspond to ports 5:4, 3:2, and 1:0, respectively.
Number of Ports per Companion Controller (N_PCC) — RO. Hardwired to 0010. This field indicates
the number of ports supported per companion host controller. It is used to indicate the port routing
configuration to system software.
Reserved. These bits are reserved and default to 0h.
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 range of 1h to Fh. The default
is 0110 (6h). However, software may write a value less than 6 for some platform configurations. A 0h
in this field is undefined. Bit 3 is always hardwired to 0.
00103206h
02
0100h
04
–
–
03h
07h
Description
Description
Attribute:
Size:
Attribute:
Size:
Intel
RO
16 bits
R/W-Special
32 bits
®
82801DBM ICH4-M Datasheet