Intel E3815 FH8065301567411 Data Sheet

Intel

®

 Atom™ Processor E3800 Product Family

2172

Datasheet

This register defines additional xHC structural parameters. This register is modified and 

maintained by BIOS.

Default: 84000054h

18:8

008h

RW/L

This field specifies the number of Interrupters 

implemented on this host controller. Each Interrupter is allocated to a vector of MSI-X, 

and controls its generation and moderation.  

The value of this field determines how many Interrupter Register Sets are addressable 

in the Runtime Register Space (refer to the xHCI for USB specification). Valid values are 

in the range of 1h to 400h. A '0' in this field is undefined.

Core

7:0

20h

RW/L

This field specifies the maximum number of 

Device Context Structures and Doorbell Array entries this host controller can support. 

Valid values are in the range of 1h to 400h. A '0' in this field is undefined.

Core

Memory Mapped I/O Register

(Size: 32 bits)

PCI Configuration Register (Size: 64 bits)

[B:0, D:20, F:0] + 10h

31

28

24

20

16

12

8

4

0

1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 0

MaxScr

atchp

adBu

fs

SP

R

Rs

vd1

ER

S

T

M

ax

IST

31:27

10h

RW/L

Valid values are 0-31. This field 

indicates the number of Scratchpad Buffers system software shall reserve for the xHC. 

Refer to xHCI for USB specification for more information.

Core

26

1b

RW/L

If Max Scratchpad Buffers is greater than '0' then this flag 

indicates whether the xHC uses the Scratchpad Buffers for saving state when executing 

Save and Restore State operations. If Max Scratchpad Buffers is = '0', then this flag 

shall be '0'. Refer to the xHCI for USB specification for more information.  

A value of '1' indicates that the xHC requires the integrity of the Scratchpad Buffer 

space to be maintained across power events.  

A value of '0' indicates that the Scratchpad Buffer space may be freed and reallocated 

between power events.

Core