AM8530 datasheet(191/194 Pages) AMD

191 / 194 page

SCC Application Notes

AMD

7–42

array[23]=0xFD;

/*Rx enable*/

array[24]=0x5;

array[25]=0x6B;

/*Tx enable*/

array[26]=0x00;

array[27]=0x80;

/*reset TxCRC*/

array[28]=0x1;

array[29]=0xE0;

/*DMA request enabled*/

array[30]=0xF;

array[31]=0x00;

/*disable all interrupts*/

array[32]=0x0;

array[33]=0x10;

/*reset external/status interrupt twice*/

array[34]=0x0;

array[35]=0x10;

array[36]=0x1;

array[37]=0xE0;

/*Rx interrupt on special condition*/

array[38]=0x9;

array[39]=0x02;

/*set master interrupt enable to 1*/

/*BEGIN INITIALIZATION ROUTINE*/

/*The following dummy read statement is used to ensure that SCC

has initialized properly*/

temp = inportb(port);

/*read from RR0*/

while(i<arraysize)

{

outportb(port, array[i++]);

}

/*THIS ROUTINE INITIALIZES THE 9517 DMA CONTROLLER*/

dmainit()

{

unsigned int lsb, temp, msb, latch, wrdh, wrd1, tmp1, start;

unsigned int bytn, byt, tmp2;

outportb(0x09, 0x01); /*clear all DMA requests on channel 1*/

outportb(0x0A, 0x05); /*mask channel 1 DMA request*/

outportb(0x0B, 0x45); /*mode register for single transfer mode,

read, auto init, address increment*/

lsb = adrr & 0xFF;

temp = adrr >> 0x08;

/*rotate ptr 8 bits to get msb*/

msb = tem[ & 0xFF;

temp = temp >> 0x08;

/*rotate 8 bits to get sector address*/

latch = temp & 0x0F;

outportb(0x81, latch);/*load sector address into DMA page reg-

ister*/

outportb(0x02, lsb);

/*lower byte of starting address*/

outportb(0x02, msb);

/*upper byte of starting address*/

start = adrr & 0xFFFF;

bytn = 0x03;

wrd1 = bytn & 0xFF;

/*lower order byte of wordcount*/

tmp1 = bytn >> 0x08;

/*rotate wordcount 8 bits for msb*/

wrdh = tmp1 & 0xFF;

/*upper byte of wordcount*/

outportb(0x03, wrd1); /*this is the lower byte of # of bytes

that fit within the first sector

outportb(0x03, wrdh); /*upper byte of wordcount*/

outportb(0x0A, 0x01); /*enable DMA*/

}

/*THIS ROUTINE WRITES THE MEMORY BUFFER ON TO THE DISK*/

closfile()

{

char var_nam, name[10];

AM8530 Datasheet(PDF) 191 Page - Advanced Micro Devices

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