Door Bell x (DBx) – Offset 3000 - 1.2 - ID:615146 | Intel® 400 Series Chipset On-Package Platform Controller Hub

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Door Bell x (DBx) – Offset 3000

Door Bell registers are an array of 32 registers.

The door bell registers are at the following offset:

Door Bell 0: 3000-3003h

Door Bell 1: 3004-3007h

.......

Door Bell 30: 3078-307Bh

Door Bell 31: 307C-307Fh

Bit Range	Default	Access	Field Name and Description
31:16	0000h	RW	DB Stream ID (DSID) 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 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 Commands. This field returns ‘0’ when read.
15:8	-	-	Reserved
7:0	00h	RW	DB Target (DT) This field defines the target of the doorbell reference. The table below defines the xHC notification that is generated by ringing the doorbell. Doorbell Register 0 is dedicated to Command Ring and decodes this field differently than the other Doorbell Registers. Refer to the xHCI Specification for definitions of the values.

Bit Range

Default

Access

Field Name and Description

31:16

0000h

DB Stream ID (DSID)

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 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 Commands. This field returns ‘0’ when read.

15:8

Reserved

7:0

00h

DB Target (DT)

This field defines the target of the doorbell reference. The table below defines the xHC notification that is generated by ringing the doorbell. Doorbell Register 0 is dedicated to Command Ring and decodes this field differently than the other Doorbell Registers.

Refer to the xHCI Specification for definitions of the values.

XECP_SUPP_USB2_0 (XECP_SUPP_USB2_0)

Event Ring Dequeue Pointer High x (ERDP_HIx) XECP_SUPP_USB2_0 (XECP_SUPP_USB2_0)