YMF740C Datasheet, PDF (35/44 Pages) List of Unclassifed Manufacturers – DS-1L

YMF740C
4. Interrupt Routing
DS-1L supports two types of interrupts, interrupt signal on the PCI bus (INTA#) and interrupt signal on the
ISA bus (IRQ[5,7,9,10,11]).
The IRQs on DS-1L are routed as shown below.
INTA#
INTA
PCI Audio
IRQ5
IRQ7
IRQ9
IRQ10
IRQ11
ISA IRQ
IMOD=1
IMOD=0
IMOD=1
IMOD=0
IRQ
Sound Blaster Pro
Select Signal
SBIRQ[2:0]
IRQ
MPU401
IMOD
Select Signal
MPUIRQ[2:0]
PCI Audio can only use INTA#, but the Sound Blaster Pro and MPU401 blocks of the Legacy Audio Block
can use any of the two protocols.
The protocol can be switched using 42-43h (Legacy Audio Control Register) of the PCI Configuration
Register.
January 14, 1999
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