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YMF744B
February 3, 1999
-33-
DS-1S supports PC/PCI and D-DMA protocols to emulate the DMA of SB Pro on the PCI. In addition, DS-
1S supports the old type of interrupts used by ISA and the Serialized IRQ protocol.
Yamaha recommends the combination of PC/PCI and Serialized IRQ.
The system block diagram when using Intel chip set is shown below.
IRQ11
IRQ10
IRQ9
IRQ7
PCREQ#
IRQ5
PCGNT#
South
Bridge
(PIIX4E)
PCI
Control
Address/Data
North
Brigde
(430TX/440BX)
SERIRQ#
Select either protocols
DS-1S
The PCI-to-ISA bridge needs to support PC/PCI. IRQ is directly connected to the IRQ input pins on the
PCI-to-ISA bridge.