| Field Name | Bits | Type | Reset Value | Description |
|---|
| Reserved | 63:12 | razRead as zero | 0x0 | reserved |
| lnk2_num_datcrds | 11:8 | rwNormal read/write | 0x0 | Controls the number of CCIX data credits assigned to Link 2 4h0: Total credits are equally divided across all links 4h1: 25% of credits assigned 4h2: 50% of credits assigned 4h3: 75% of credits assigned 4h4: 100% of credits assigned 4hF: 0% of credits assigned |
| lnk2_num_reqcrds | 7:4 | rwNormal read/write | 0x0 | Controls the number of CCIX request credits assigned to Link 2 4h0: Total credits are equally divided across all links 4h1: 25% of credits assigned 4h2: 50% of credits assigned 4h3: 75% of credits assigned 4h4: 100% of credits assigned 4hF: 0% of credits assigned |
| lnk2_snoopdomain_req | 3 | rwNormal read/write | 0x0 | Controls Snoop domain enable (SYSCOREQ) for CCIX Link 2 |
| lnk2_link_up | 2 | rwNormal read/write | 0x0 | Link Up status. Software writes this register bit to indicate Link status after polling Link_ACK and Link_DN status in the remote agent 1b0: Link is not Up. Software clears Link_UP when Link_ACK status is clear and Link_DN status is set in both local and remote agents. The local agent stops responding to any protocol activity from remote agent, including acceptance of protocol credits, when Link_UP is clear 1b1: Link is Up. Software sets Link_UP when Link_ACK status is set and Link_DN status is clear in both local and remote agents; the local agent starts sending local protocol credits to remote agent |
| lnk2_link_req | 1 | rwNormal read/write | 0x0 | Link Up/Down request; software writes this register bit to request a Link Up or Link Down in the local agent 1b0: Link Down request NOTE: The local agent does not return remote protocol credits yet since remote agent may still be in Link_UP state. 1b1: Link Up request |
| lnk2_link_en | 0 | rwNormal read/write | 0x0 | Enables CCIX Link 2 when set 1b0: Link is disabled 1b1: Link is enabled |