12th Generation Intel® Core™ Processors Datasheet Volume 2 of 2
| ID | Date | Version | Classification |
|---|---|---|---|
| 767625 | 07/13/2023 | Public |
System Agent Performance Status (SA_PERF_STATUS_0_0_0_MCHBAR_PCU) – Offset 5918
Indicates current various System Agent PLL ratios.
Operating frequency needs to be calculated according to reference clock (BCLK).
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 63:56 | 0h | RO | Reserved |
| 55:40 | 0x0 | RO/V | System Agent Voltage (SA_VOLTAGE) This register holds the System Agent voltage. This voltage value is valid only if the System Agent VR is SVID based. |
| 39:32 | 0x20 | RO/V | PSF0 PLL Ratio (PSF0_RATIO) Reports the PSF0 PLL ratio. |
| 31:24 | 0x0 | RO/V | RING UCLK PLL Ratio (UCLK_RATIO) RING UCLK RATIO. Reference=100Mhz |
| 23:18 | 0x0 | RO/V | IPU PS Ratio (IPU_PS_RATIO) The frequency is 25MHz * Ratio. |
| 17:12 | 0x0 | RO/V | IPU IS Divisor (IPU_IS_DIVISOR) The frequency is 1600MHz/Divisor. |
| 11 | 0x0 | RO/V | On Package Interface (OPI) Link Speed (OPI_LINK_SPEED) 0: 2Gb/s |
| 10 | 0x0 | RO/V | DDR QCLK Reference (QCLK_REFERENCE) 0: 133.34Mhz. In frequency calculations use 400.0MHz/3.0. |
| 9:2 | 0x0 | RO/V | DDR QCLK Ratio (QCLK_RATIO) Reference determined by the QCLK_REFERENCE field. |
| 1:0 | 0x0 | RO/V | Last Display Engine Workpoint Request Served (LAST_DE_WP_REQ_SERVED) Last display engine workpoint request served by the PCU |