FW82801EB Intel, FW82801EB Datasheet - Page 485
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FW82801EB
Manufacturer Part Number
FW82801EB
Description
Manufacturer
Intel
Datasheet
1.FW82801EB.pdf
(671 pages)
Specifications of FW82801EB
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13.1.12
13.1.13
13.1.14
13.1.15
Intel
®
82801EB ICH5 / 82801ER ICH5R Datasheet
INT_LN—Interrupt Line Register
SID—USB EHCI Subsystem ID Register
(USB EHCI—D29:F7)
Address Offset:
Default Value:
Reset:
CAP_PTR—Capabilities Pointer Register
(USB EHCI—D29:F7)
Address Offset:
Default Value:
(USB EHCI—D29:F7)
Address Offset:
Default Value:
INT_PN—Interrupt Pin Register
(USB EHCI—D29:F7)
Address Offset:
Default Value:
15:0
Bit
7:0
Bit
7:0
Bit
7:0
Bit
Capabilities Pointer (CAP_PTR) — RO. This register points to the starting offset of the USB 2.0
capabilities ranges.
Interrupt Line (INT_LN) — R/W. This data is not used by the Intel
register to communicate to software the interrupt line that the interrupt pin is connected to.
Interrupt Pin — RO. The value of 04h indicates that the EHCI function within the Intel
multi-function USB device will drive the fourth interrupt pin from the device- INTD# in PCI terms. The
value of 04h in function 7 is required because the PCI Local Bus Specification, Revision 2.3 doesn’t
recognize more than 4 interrupts and older APM-based OSs require that each function within a
multi-function device has a different Interrupt Pin Register value.
NOTE: Internally the EHCI controller uses PIRQH#.
Subsystem ID (SID) — R/W (special). BIOS sets the value in this register to identify the Subsystem
ID. This register, in combination with the Subsystem Vendor ID register, enables the operating
system to distinguish each subsystem from other(s).
NOTE: Writes to this register are enabled when the WRT_RDONLY bit (offset 80h, bit 0) is set to 1.
2E
XXXXh
None
34h
50h
3Ch
00h
3Dh
04h
–
2Fh
Description
Description
Description
Description
Attribute:
Size:
Attribute:
Size:
Attribute:
Size:
Attribute:
Size:
EHCI Controller Registers (D29:F7)
RO
8 bits
R/W
8 bits
RO
8 bits
R/W (special)
16 bits
®
ICH5. It is used as a scratchpad
®
ICH5’s
485
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