FEC FEB-9455 - Page 52

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FEB-9455 User’s Manual

// Enter Extended Function Mode

outp(0x002E, 0x87);

// Assign Pin121-128 to be GPIO port 1

outp(0x002E, 0x29);

outp(0x002F, inp(0x002F) | 0x01);

// Select Logic Device 7

outp(0x002E, 0x07);

outp(0x002F, 0x07);

// Active Logic Device 7

outp(0x002E, 0x30);

outp(0x002F, 0x01);

// Select Inversion Mode

outp(0x002E, 0xF2);

outp(0x002F, 0x83);

// Select I/O Mode

// Bit0~bit3 output and bit4~bit7 input

outp(0x002E, 0xF1);

outp(0x002F, 0x00);

// Access GPIO ports

outp(0x002E, 0xF0);

outp(0x002F, 0x7C);

// Exit Extended Function Mode

outp(0x002E, 0xAA);

Definitions of Variables:

Each bit in the lower nibble of each Register represents the setting of a GPIO port.

Bit0 vs. GPIO DIO-Out 0

Bit1 vs. GPIO DIO-Out 1

Bit7 vs. GPIO DIO-Out 3

Bit4 vs. GPIO DIO-In 0

Bit3 vs. GPIO DIO-In 3