NH82801HEM S LB9B Intel, NH82801HEM S LB9B Datasheet - Page 596
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NH82801HEM S LB9B
Manufacturer Part Number
NH82801HEM S LB9B
Description
Manufacturer
Intel
Datasheet
1.NH82801HEM_S_LB9B.pdf
(890 pages)
Specifications of NH82801HEM S LB9B
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15.1.24
596
FL_ADJ—Frame Length Adjustment Register
(USB EHCI—D29:F7, D26: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, D26: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.
7:6
5:0
Bit
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
59488
59504
59520
59984
60000
60480
60496
—
—
Frame Length Timing Value (this
Description
Attribute:
Size:
register) (decimal)
EHCI Controller Registers (D29:F7, D26:F7)
31
32
62
63
—
—
0
1
2
R/W
8 bits
Intel
®
ICH8 Family Datasheet
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