Intel® Core™ Ultra Series 3 Processors I/O Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 872352 | 04/14/2026 | 001 | Public |
Packet Error Check Data Register (PEC) – Offset 8
Note: This register may reside in either the core well or the suspend well. To simplify the implementation, this register will be in the suspend well with the suspend well version of PCI reset (URST33B).
This register contains the 8-bit CRC value that is used as the Packet Error Check on SMBus. For writes, this register is written by software prior to running the command. For reads, this register is read by software after the read command is completed on SMBus.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 7:0 | 0h | RW | PEC_DATA (PEC_DATA) This 8-bit register is written with the SMBus PEC data prior to a write transaction. For read transactions, the PEC data is loaded from the SMBus into this register and is then read by software. Software must ensure that the INUSE_STS bit is properly maintained to avoid having this field over-written by a write transaction following a read transaction. |