Audio
32
– Reference
VSBC-8 Reference Manual
Audio
The audio interface on the VSBC-8 is implemented using the Cirrus Logic CS4281 PCI based
audio controller and the CS4297A audio Codec ’97. This interface meets or exceeds Microsoft’s
PC 97, PC 98 and PC 99 audio performance requirements. Drivers are available for all Windows
based operating systems. To obtain the most current versions, consult the VSBC-8 Product
Support web page at
www.versalogic.com/private/vsbc8support.asp.
J6 provides the low level stereo input and low level stereo output connection points. The outputs
will drive any standard “powered” PC speaker set. Also, TTL level up / down volume controls
are provided. An “up” pushbutton switch and a ‘down” pushbutton switch are normally
connected between the appropriate pins on the connector and the ground reference. Activation of
a switch results in the volume level stepping up or down.
S
OFTWARE
C
ONFIGURATION
The audio interface uses PCI interrupt “INTD*”. The CMOS Setup screen is used to select the
IRQ line routed to INTD*.
E
XTERNAL
C
ONNECTIONS
Connector J6 is configured so that a standard 4-pin CD-ROM audio connector can be used to
directly provide the low level stereo input.
Table 15: Audio Connector
J6
Pin
Signal
Name
Function
1
VOL-DN
Volume down switch input
3
GND
Switch Ground
7
VOL-UP
Volume up switch input
5
GND
Switch Ground
2,4,6,8,11,
12,13,14,
AGND
Audio Ground
9
R-OUT
Right channel output
15
L-OUT
Left channel output
10
R-IN
Right channel input
16
L-IN
Left channel input
