Intel® 400 Series Chipset On-Package Platform Controller Hub
Online Register Database
ID | Date | Version | Classification |
---|---|---|---|
615146 | 08/09/2019 | 1.2 | Public |
Event Ring Dequeue Pointer Low x (ERDP_LOx) – Offset 2038
There are 8 ERDP_LO registers available at the following address offsets:
ERDP_LO0: at offset 2038h
ERDP_LO1: at offset 2058h
ERDP_LO2: at offset 2078h
ERDP_LO3: at offset 2098h
ERDP_LO4: at offset 20B8h
ERDP_LO5: at offset 20D8h
ERDP_LO6: at offset 20F8h
ERDP_LO7: at offset 2118h
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
31:4 | 0000000h | RW | Event Ring Dequeue Pointer (ERDP) This field may be used by the xHC to accelerate checking the Event Ring full condition. This field is written with the low order 3 bits of the offset of the ERST entry which defines the Event Ring segment that Event Ring Dequeue Pointer resides in. |
3 | 0b | RW/1C | Event Handler Busy (EHB) This flag shall be set to ‘1’ when the IP bit is set to ‘1’ and cleared to ‘0’ by software when the Dequeue Pointer register is written. |
2:0 | 0h | RW | Dequeue ERST Segment Index (DESI) This field may be used by the xHC to accelerate checking the Event Ring full condition. This field is written with the low order 3 bits of the offset of the ERST entry which defines the Event Ring segment that Event Ring Dequeue Pointer resides in. |