Intel E3815 FH8065301567411 数据表
产品代码
FH8065301567411
Intel
®
Atom™ Processor E3800 Product Family
2494
Datasheet
Default: 00000000h
19.6.34
DB_0—Offset 480h
The Doorbell Array is organized as an array of up to 256 Doorbell Registers. One 32-bit
Doorbell Register is defined in the array for each Device Slot. System software utilizes
the Doorbell Register to notify the xHC that it has Device Slot related work for the xHC
to perform.
Access Method
Default: 00000000h
Type:
Memory Mapped I/O Register
(Size: 32 bits)
ERDP_HI:
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 0 0 0 0 0 0 0 0 0 0 0
ERD_P
N
TR
Bit
Range
Default &
Access
Description
31:0
0h
RW
ERD_PNTR:
Reg field ERD_PNTR
Type:
Memory Mapped I/O Register
(Size: 32 bits)
DB_0:
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 0 0 0 0 0 0 0 0 0 0 0
DB_S
TREA
M
_
ID
RSVD
33
DB
_
TA
R
GE
T
Bit
Range
Default &
Access
Description
31:16
0h
RW
DB_STREAM_ID:
DB Stream ID - RW. Doorbell Stream ID. If the endpoint of a Device
Context Doorbell defines Streams, then this field shall be used to identify which Stream
of the endpoint the doorbell reference is targeting. System software is responsible for
ensuring that the value written to this field is valid. If the endpoint defines Streams
(MaxPStreams ) 0), then 0, 65535 (No Stream) and 65534 (Prime) are reserved Stream
ID values and shall not be written to this field. If the endpoint does not define Streams
(MaxPStreams = 0) and a non-'0' value is written to this field, the doorbell reference
shall be ignored. This field only applies to Device Context Doorbells and shall be cleared
to 0 for Host Controller Command Doorbells. This field returns 0 when read.
15:8
0h
RO
RSVD33:
reserved