Appendix K − Soft-off Control
The Advanced/RH design supports
The registers in the Ultra I/O controller that sets the I/O address and control of the CS1 pin is NOT setup until the SMM code is activated. The code performs the following operations:
OUT 0Ch to I/O port 2Eh
OUT 75h to I/O port 2Fh
OUT 11h to I/O port 2Eh
OUT 00h to I/O port 2Fh
OUT 0Dh to I/O port 2Eh
OUT A0h to I/O port 2Fh
After setting the above registers, any read operation to I/O location 75H will trigger the
Advanced/RH Technical Product Specification ∙ Page 46
