NH82801GHM S L8YR Intel, NH82801GHM S L8YR Datasheet - Page 555
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NH82801GHM S L8YR
Manufacturer Part Number
NH82801GHM S L8YR
Description
Manufacturer
Intel
Datasheet
1.NH82801GHM_S_L8YR.pdf
(848 pages)
Specifications of NH82801GHM S L8YR
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Compliant
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EHCI Controller Registers (D29:F7)
13.1.23
13.1.24
Intel
®
ICH7 Family Datasheet
USB_RELNUM—USB Release Number Register
(USB EHCI—D29:F7)
Address Offset: 60h
Default Value:
FL_ADJ—Frame Length Adjustment Register
(USB EHCI—D29:F7)
Address Offset: 61h
Default Value:
This feature is used to adjust any offset from the clock source that generates the clock
that drives the SOF counter. When a new value is written into these six bits, the length
of the frame is adjusted. Its initial programmed value is system dependent based on
the accuracy of hardware USB clock and is initialized by system BIOS. This register
should only be modified when the HChalted bit (D29:F7:CAPLENGTH + 24h, bit 12) in
the USB2.0_STS register is a 1. Changing value of this register while the host controller
is operating yields undefined results. It should not be reprogrammed by USB system
software unless the default or BIOS programmed values are incorrect, or the system is
restoring the register while returning from a suspended state.
These bits in suspend well and not reset by a D3-to-D0 warm rest or a core well reset.
7:0
7:6
5:0
Bit
Bit
USB Release Number — RO. A value of 20h indicates that this controller follows
Universal Serial Bus (USB) Specification, Revision 2.0.
Reserved — RO. These bits are reserved for future use and should read as 00b.
Frame Length Timing Value — R/W. Each decimal value change to this register
corresponds to 16 high-speed bit times. The SOF cycle time (number of SOF counter
clock periods to generate a SOF micro-frame length) is equal to 59488 + value in this
field. The default value is decimal 32 (20h), which gives a SOF cycle time of 60000.
Frame Length (# 480 MHz
Clocks) (decimal)
20h
20h
59488
59504
59520
59984
60000
60480
60496
—
—
Frame Length Timing Value (this
Description
Description
Attribute:
Size:
Attribute:
Size:
register) (decimal)
31
32
62
63
—
—
0
1
2
RO
8 bits
R/W
8 bits
555
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