Intel® Core™ Ultra Series 3 Processors I/O Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 872352 | 04/14/2026 | 001 | Public |
DC Offset Control Register, right channel (PDMCTRL0_DC_OFFSET_RIGHT_A) – Offset 1112c
After completion of the computation of all specified taps of the filter the signed binary value from this register is added to the output of the filter to compensate the DC offset that can be present in the output of the PDM microphone.
The firmware can measure the offset by integrating the audio samples with a very slow lowpass filter, and then apply incremental correction.
Although the software can write into this register at any time, it is desirable to limit the individual increments to avoid audible artifacts.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 31:22 | 0h | RO | Reserved Bits (RSVD0) This is a Reserved Register |
| 21:0 | 0h | RW | DC OFFS (DC_OFFS) The value written into this register is treated as signed 2#s complement binary value and added to the output of the FIR filter. |