EVOC PPC-1507, Manual

Page: 34 / 81

Chapter 3 Motherboard Installation
­ 28 ­ PPC­1507
Digital I/O Interface
Digital I/O is 2x5PIN interface and its pin definitions are as follows:
Pin Signal Name Pin Signal Name
1 GPIO16 2 GPI29
3 GPIO19 4 GPI31
5 GPIO27 6 GPI41
7 GPIO28 8 GPIO24
GPIO1
9 VCC3V 10 GND
Example for south bridge gpio setup (reference only):
1
、
Enable gpio
2
、
Get the base address of gpio
3
、
Set the defined functional pin as gpio mode
4
、
Set the defined pin as input output mode
e.g. gpio32~gpio35 are used as input, gpio36~gpio39 are used as output.
;; enable gpio
mov dx,0CF8h ;CF8 is PCI configuration index port
mov eax,8000F84Ch ;BUS:0 DEV:1F FUN:0 REG:4C (Dword Reg)
out dx,eax ;
add dx,4 ;CFC is PCI configuration data port
in eax,dx ;read 0cfch to ax
or eax,10h;bit4,0=disable,1=enable
out dx,eax
;;;1, read GPIO base address
mov dx, 0CF8h ;PCI configuration index port
mov eax, 8000F848h ;BUS:0 DEV:1F FUN:0 REG:48(Dword Reg)
;south bridge configuration space reg 0x48­49