Intel® Core™ Ultra 200H and 200U Series Processors CFG and MEM Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 844345 | 01/29/2025 | 001 | Public |
Refresh Timing Parameters (TC_RFTP_0_0_0_MCHBAR) – Offset e4a0
Refresh timing parameters
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 63:59 | 0h | RO | Reserved |
| 58:51 | 18h | RW | REFsb to ACT Different Bank Delay - tREFSBRD (tREFSBRD) Enforces min delay from refsb to act. Specified in tCK (WCK for LPDDR5). In LPDDR5 BG mode, used to enforce PBR2ACT timing restriction. |
| 50:40 | 3ch | RW | Refresh Per Bank Cycle Time - tRFCpb (tRFCpb) Refresh time in tCK (WCK for LPDDR5) for REFpb |
| 39:32 | 23h | RW | 9xtREFI Time (tREFIx9) Maximum time allowed between refreshes to a rank (in intervals of 1024 DCLK cycles). Should be programmed to 8*tREFI/1024 (to allow for possible delays from ZQ or isoc). |
| 31 | 0h | RO | Reserved |
| 30:18 | b4h | RW | Refresh Cycle Time - tRFC (tRFC) Time of refresh - from beginning of refresh until next ACT or refresh is allowed (in tCK (WCK for LPDDR5) cycles, default is 180). |
| 17:0 | 1004h | RW | Refresh Interval - tREFI (tREFI) Defines the average period between refreshes, and the rate that tREFI counter is incremented (in tCK (WCK for LPDDR5) cycles, default is 4100). |