NH82801FBM S L89K Intel, NH82801FBM S L89K Datasheet - Page 538
NH82801FBM S L89K
Manufacturer Part Number
NH82801FBM S L89K
Description
Manufacturer
Intel
Datasheet
1.NH82801FBM_S_L89K.pdf
(786 pages)
Specifications of NH82801FBM S L89K
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EHCI Controller Registers (D29:F7)
14.1.24
538
FL_ADJ—Frame Length Adjustment Register
(USB EHCI—D29:F7)
Address Offset:
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.
Bit
7:6
5:0
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)
61h
20h
(decimal)
59488
59504
59520
59984
60000
60480
60496
—
—
Intel
Frame Length Timing Value (this register)
Description
®
I/O Controller Hub 6 (ICH6) Family Datasheet
Attribute:
Size:
(decimal)
31
32
62
63
—
—
0
1
2
R/W
8 bits
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