SCD128410QCE Intel, SCD128410QCE Datasheet - Page 96

• Manufacturer Part Number: SCD128410QCE
• Manufacturer: Intel

Specifications of SCD128410QCE

• Pin Count: 100
• Lead Free Status / RoHS Status: Not Compliant

CD1284 — IEEE 1284-Compatible Parallel Interface Controller
6.3.1.3
6.3.1.4
96
each
sequence */
status */
sequence */
}
Serial Transmit Service
/* The transmit service acknowledge routine follows very nearly the same steps that
the receive service routine follows. This time, the TIR is used to force the switch
to a transmit service for the requesting channel. */
service_txm( )
{
value */
*/
*/
*/
}
Modem Service
/* Code to handle modem signal change service request can be simple or complex
depending on whether port control is handled directly in the service routine or
simply noted with status returned. The following routine services the request and
returns the status of which signals changed with the channel number OR’ed into the
}
char
int
save_tir = inportb(TIR);
channel = save_tir & 0x03;
save_car = inportb(CAR);
outportb(CAR, save_tir);
for ( i = 0; i < char_count; i++) {/* transmit FIFO can take 12 characters
}
outportb(TIR, save_tir & 0x3f);/* terminate service ack. sequence */
outportb(CAR, save_car);
return(0);
case 7:
/* Buffer management code would set-up pointers to the next 12
*/
outportb(TDR, *next_char++);
/* it is assumed that char_count and next_char is set up by buffer code
* characters (maximum) to be sent on this channel. Again, buffer
* layout is system design dependent and won’t be shown here.
/* Code here would put the character in a buffer of some sort for
}
outportb(RIR, save_rir & 0x3f);/* terminate service ack.
outportb(CAR, save_car);
return(0);
break;
status = inportb(RDSR);/* by definition, only one char; get
outportb(RIR, save_rir & 0x3f);/* terminate service ack.
outportb(CAR, save_car);
return(status);
break;
save_tir, save_car, channel;
char_count, i;
* channel. That code would be dependent on system software design
* so it won’t be shown here. */
/* restore original CAR */
/* exception data service request */
/* just return the error type */
/* retrieve and save transmit interrupt
/* extract channel number from the TIR*/
/* save CAR for restore */
/* switch CD1284 to service ack. context
/* restore original CAR* /
/* restore original CAR */
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