Intel® 400 Series Chipset On-Package Platform Controller Hub
Online Register Database
ID | Date | Version | Classification |
---|---|---|---|
615146 | 08/09/2019 | 1.2 | Public |
Serial IRQ Control (SCNT) – Offset 64
Serial IRQ Control.
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
7 | 0b | RW | Enable (EN) When set, serial IRQs will be recognized. |
6 | 0b | RW | Mode (MD) When set, the serial IRQ machine will be in continuous mode. When cleared, the serial IRQ machine will be in quiet mode. When setting the EN bit, this bit must also be written as a one to guarantee that the first action of the serial IRQ machine will be a start frame. |
5:2 | 4h | RO | Frame Size (FS) Fixed field that indicates the size of the SERIRQ frame as 21 frames. |
1:0 | 00b | RW | Start Frame Pulse Width (SFPW) This is the number of 33 MHz clocks that the SERIRQ pin will be driven low by the Serial IRQ controller to signal a start frame. In continuous mode, the controller will drive the start frame for the number of clocks specified. In quiet mode, the controller will drive the start frame for the number of clocks specified minus one, as the first clock was driven by the peripheral. |