Intel 6300ESB Datasheet page 506

Table 410. Offset 04 - 07h: HCSPARAMS—Host Controller Structural Parameters
(Sheet 2 of 2)
29
Device:
04-07h
Offset:
00102204h
Default Value:
Bits Name
15:1 Number of Companion
2 Controllers (N_CC)
Number of Ports per
11:8 Companion Controller
(N_PCC)
7:4 Reserved
3:0 N_PORTS
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Intel 6300ESB I/O Controller Hub
DS
506
Attribute:
Description
This field indicates the number of companion controllers
associated with this USB ECHI 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 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.
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The Intel 6300ESB ICH allows the default value of 2h to be
over-written by BIOS. Since the Intel
support more than two 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 1 and Function 0, which correspond to ports
3:2 and 1:0, respectively.
This field indicates the number of ports supported per
companion host controller. It is used to indicate the port
routing configuration to system software. The Intel
6300ESB ICH hardwires this field to 2h.
Reserved. These bits are reserved and default to '0'.
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.
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The Intel 6300ESB ICH reports 4h by default. However,
software may write a value less than four for some platform
configurations. A '0' in this field is undefined. Bit 3 is always
hardwired to '0'.
7
Function:
Read/Write-Special
32-bit
Size:
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6300ESB ICH cannot
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Order Number: 300641-004US
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Intel 6300ESB ICH—11
Access
RO
November 2007