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34 ASUS P2B-D/P2B-DS User’s Manual
22. SB-Link™ Connector (6-1 pin DMA_HEADER) (optional/reserved)
Using Intel’s PC-PCI and serialized IRQ protocols found in this motherboard’s
AGPset, this connector allows Sound Blaster 16 compatibility to AWE64D (Digi-
tal) or other PCI audio cards, enabling users to play Real-mode DOS games and
multimedia applications. SB-Link acts as a bridge between the motherboard and
the PCI audio card by providing the DMA and IRQ signals present in the ISA
bus but not available on the PCI bus.
DMA_HEADER
Serial IRQ
PC/PCI Request Sideband Signal
PC/PCI Grant Sideband Signal
DGND
21
56
NOTE: Pin 3 is removed to ensure the
correct orientation of the cable on it.
1
1
R
DGND
P2B-D/DS SB-Link™ Connector
23. SMBus Connector (3-pin SMB) (optional/reserved)
This connector allows you to connect SMBus devices. SMBus devices commu-
nicate by means of the SMBus with an SMBus host and/or other SMBus de-
vices. The SMBus or System Management Bus is a specific implementation of
an I
2
C bus, which is a multi-master bus, that is, multiple chips can be connected
to the same bus and each one can act as a master by initiating data transfer.
P2B-D/DS SMBus Connector
1
1
R
SMB
III. INSTALLATION
Connectors
III. INSTALLATION