Frame Length Adjustment (FLADJ) – Offset 61 - 001 - ID:834576 | Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2

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Frame Length Adjustment (FLADJ) – Offset 61

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 in the USBSTS register is a one. Changing value of this register while the host controller is operating yields undefined results.

Bit Range	Default	Access	Field Name and Description
7	0h	RO	Reserved (RSVD)
6	1h	RO	No Frame Length Timing Capability (NO_FRAME_LENGTH_TIMING_CAP) This flag is set to 1 to indicate that the host controller does not support a programmable Frame Length Timing Value field.
5:0	20h	RO	Frame Length Timing Value (FLTV) 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 (number of High Speed bit times) FLADJ Value (decimal) (decimal) 59488 0 (00h) 59504 1 (01h) 59520 2 (02h) ... 59984 31 (1Fh) 60000 32 (20h) ... 60480 62 (3Eh) 60496 63 (3Fh) 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 (# High Speed bit times) FLADJ Value

Bit Range

Default

Access

Field Name and Description

Reserved (RSVD)

No Frame Length Timing Capability (NO_FRAME_LENGTH_TIMING_CAP)

This flag is set to 1 to indicate that the host controller does not support a programmable Frame Length Timing Value field.

5:0

20h

Frame Length Timing Value (FLTV)

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
(number of High Speed bit times) FLADJ Value
(decimal) (decimal)
59488 0 (00h)
59504 1 (01h)
59520 2 (02h)
...
59984 31 (1Fh)
60000 32 (20h)
...
60480 62 (3Eh)
60496 63 (3Fh)
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 (# High Speed bit times) FLADJ Value

Best Effort Service Latency (BESL)

Serial Bus Release Number (SBRN) Best Effort Service Latency (BESL)