Intel® Core™ Ultra Series 3 Processors I/O Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 872352 | 04/14/2026 | 001 | Public |
SCL Extended Low Count Timing Register (DWC_mipi_i3c_HCI_block.SCL_EXT_LCNT_TIMING) – Offset 228
SCL Extended Low Count Timing Register.
This register sets the extended low periods for the I3C transfers to allow the low data rates of the Slave devices
as specified in GETMXDS CCC.The Speed field of Transfer command (COMMAND_QUEUE_PORT_TRANSFER_COMMAND) decides the selection
of extended low period to achieve the lower data rate for the transfers to Slave devices.
- SDR1: Uses I3C_EXT_LCNT_1 field for the data transfer.
- SDR2: Uses I3C_EXT_LCNT_2 field for the data transfer.
- SDR3: Uses I3C_EXT_LCNT_3 field for the data transfer.
- SDR4: Uses I3C_EXT_LCNT_4 field for the data transfer.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 31:24 | 20h | RW | (I3C_EXT_LCNT_4) I3C Extended Low Count Register 4 |
| 23:16 | 20h | RW | (I3C_EXT_LCNT_3) I3C Extended Low Count Register 3 |
| 15:8 | 20h | RW | (I3C_EXT_LCNT_2) I3C Extended Low Count Register 2 |
| 7:0 | 20h | RW | (I3C_EXT_LCNT_1) I3C Extended Low Count Register 1 |