Intel E3815 FH8065301567411 Data Sheet
Product codes
FH8065301567411
Intel
®
Atom™ Processor E3800 Product Family
Datasheet
2511
19.6.51
USBLEGSUP—Offset 880h
The USBLEGSUP capability requires support for Byte accesses for Semaphore address,
refer to section 7.1.of xhci specification. usb legacy support capability DW
Access Method
Default: 00000401h
7:0
0h
RW
DB_TARGET:
DB Target RW. Doorbell Target. This field defines the target of the
doorbell reference. The table below defines the xHC notification that is generated by
ringing the doorbell. Note that Doorbell Register 0 is dedicated to Command Ring and
decodes this field differently than the other Doorbell Registers. Device Context Doorbells
(1-255) for Value 0 the Definition is Reserved for Value 1 the Definition is Control EP 0
Enqueue Pointer Update for Value 2 the Definition is EP 1 OUT Enqueue Pointer Update
for Value 3 the Definition is EP 1 IN Enqueue Pointer Update for Value 4 the Definition is
EP 2 OUT Enqueue Pointer Update for Value 5 the Definition is EP 2 IN Enqueue Pointer
Update . . . for Value 30 the Definition is EP 15 OUT Enqueue Pointer Update for Value
31 the Definition is EP 15 IN Enqueue Pointer Update for Value 32:247 the Definition is
Reserved for Value 248:255 the Definition is Vendor Defined Host Controller Doorbell (0)
for Value 0 the Definition is Command Doorbell for Value 1:247 the Definition is
Reserved for Value 248:255 the Definition is Vendor Defined This field returns 0 when
read and should be treated as undefined by software. When the Command Doorbell is
written, the DB Stream ID field shall be cleared to 0.
Bit
Range
Default &
Access
Description
Type:
Memory Mapped I/O Register
(Size: 32 bits)
USBLEGSUP:
BAR Type:
PCI Configuration Register (Size: 32 bits)
BAR Reference:
[B:0, D:22, F:0] + 10h
31
28
24
20
16
12
8
4
0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1
RSVD
35
HC
_OS
_
O
W
NE
D
RSVD
34
HC
_B
IOS
_
O
W
NE
D
N
E
XT_CAP
ABILITY_POINTER
CA
PA
BI
LI
TY_
ID
Bit
Range
Default &
Access
Description
31:25
0h
RO
RSVD35:
reserved
24
0h
RW
HC_OS_OWNED:
Reg field HC_OS_OWNED SEMAPHORE
23:17
0h
RO
RSVD34:
reserved
16
0h
RW
HC_BIOS_OWNED:
Reg field HC_BIOS_OWNED SEMAPHORE
15:8
04h
RO
NEXT_CAPABILITY_POINTER:
Reg field NEXT_CAPABILITY_POINTER