YMF754-R datasheet(46/60 Pages) YAMAHA

46 / 60 page

YMF754

June 28, 1999

-46-

4. Interrupt Routing

DS-1E supports three types of interrupts, interrupt signal on the PCI bus (INTA#), interrupt signal on the ISA

bus (IRQ[5,7,9,10,11]), and Serialized IRQ.

The IRQs on DS-1E are routed as shown below.

Sound Blaster Pro

MPU401

IRQ

SBIRQ[2:0]

ISA IRQ

SERIRQ

MPUIRQ[2:0]

SIEN, IMOD

SIEN=0, IMOD=1

SIEN=0, IMOD=0

SIEN=1, IMOD=0

SIEN=0, IMOD=1

SIEN=0, IMOD=0

SIEN=1, IMOD=0

Select Signal

IRQ5

IRQ7

IRQ9

IRQ10

IRQ11

SERIRQ#

INTA#

INTA

PCI Audio

PCI Audio can only use INTA#, but the Sound Blaster Pro and MPU401 blocks of the Legacy Audio Block

can use any of the three protocols.

The protocol can be switched using 40-43h (Legacy Audio Control Register) of the PCI Configuration

4-1. Serialized IRQ

Serialized IRQ is a method to encode IRQs of 15 channels into one signal.

DS-1E provides the SERIRQ# pin to support Serialized IRQ.

Only one channel out of the 5 channels, IRQ5, IRQ7, IRQ9, IRQ10, and IRQ11, can be encoded into the

IRQ/Data frame of Serialized IRQ.

The IRQ channel is selected using 40h-43h (Legacy Audio Control Register) of the PCI Configuration

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