| Field Name | Bits | Type | Reset Value | Description |
|---|
| valid | 63 | rwNormal read/write | 0x0 | Address Region 1 fields are programmed and valid |
| pos_early_wr_comp_en | 62 | rwNormal read/write | 0x1 | Enables early write acknowledgment in Address Region 1; used to improve write performance |
| pos_early_rdack_en | 61 | rwNormal read/write | 0x1 | Enables sending early read receipts from HN-I in Address Region 1; used to improve ordered read performance |
| ser_devne_wr | 60 | rwNormal read/write | 0x0 | Used to serialize Device-nGnRnE writes within Address Region 1 |
| ser_all_wr | 59 | rwNormal read/write | 0x0 | Used to serialize all writes within Address Region 1 |
| physical_mem_en | 58 | rwNormal read/write | 0x0 | Address Region 1 follows Arm Architecture Reference Manual physical memory ordering guarantees |
| Reserved | 57:56 | razRead as zero | 0x0 | reserved |
| base_addr | 55:20 | rwNormal read/write | 0x0 | Address Region 1 base address; [address width-1:12] CONSTRAINT: Must be an integer multiple of the Address Region 1 size. |
| Reserved | 19:16 | razRead as zero | 0x0 | reserved |
| addr_region_size | 15:10 | rwNormal read/write | 0x0 | <n>; used to calculate Address Region 1 size (2^n*4KB) CONSTRAINT: <n> must be configured so that the Address Region 1 size is less than or equal to 2^(address width). |
| Reserved | 9:6 | razRead as zero | 0x0 | reserved |
| order_region_size | 5:0 | rwNormal read/write | 0x0 | <n>; used to calculate Order Region 1 size within Address Region 1 (2^n*4KB) |