參數(shù)資料
型號(hào)： CD1283
廠商： Intel Corp.
英文描述： IEEE 1284-Compatible Parallel Interface
中文描述： 符合IEEE 1284兼容并行接口
文件頁數(shù)： 50/94頁
文件大?。?/td> 1237K
代理商： CD1283
CD1283
—
IEEE 1284-Compatible Parallel Interface
50
Datasheet
When the SVCACK* is activated, the SVCREQP* is deactivated. If the SVCACKP* signal is not
activated, then the service request must be removed by clearing PpIreq (PIR[7]), and the source of
the interrupt must be determined by reading the LIVR, PIVR, or PIR. Regardless of the variation
performed, IntEn (PFCR[4]) must be toggled at the end of the service routine to inform the device
that the service routine has terminated.
service_par( )
{
char
livr_val;
if (inportb(SVRR & 0x08)) { /* check for active service request */
livr_val = inportb(LIVR) & 0x07;
switch (livr_val) {
case 4:
state-machine request is active */
service_par_chan();
break;
case 5:
request is active */
service_pipeline();
break;
case 6:
service_par_chan();
service_pipeline();
break;
default:
break;
}
outportb(PFCR, inportb(PFCR & 0xEF);/* terminate service ack. sequence
by */
outportb(PFCR, inportb(PFCR | 0x10);/* toggling IntEn bit in PFCR */
return(0);
}
}
/* just the parallel channel
/* just the data path pipeline
/* both requests are active */
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參數(shù)描述
CD1284 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
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