Intel 386 User Manual

Page 458

14-23

CHIP-SELECT UNIT

Assumptions:

REMAPCFG register has Expanded I/O space access enabled (ESE bit set).

void Init_CSU(void)

{

_SetEXRegWord(UCSADL, 0x700); /* Configure the upper chip select */

_SetEXRegWord(UCSADH, 0x0);

_SetEXRegWord(UCSMSKL, 0xFC01);

_SetEXRegWord(UCSMSKH, 0x7);

_SetEXRegWord(CS4ADL, 0x300); /* Configure chip select 4 */

_SetEXRegWord(CS4ADH, 0x8);

_SetEXRegWord(CS4MSKL, 0xF801);

_SetEXRegWord(CS4MSKH, 0x7);

}