Product specifications

Design Guide - VT82C694X Apollo Pro133 with VT82C686A
Preliminary Revision 0.5, November 19, 1999 62 Motherboard Design Guidelines
Technologies, Inc.
We ConnectWe Connect
AC'97 CONTROLLER
10K
ohm
VT82C686A
(South Bridge)
VT1611A
(Audio Codec)
SYNC
SDOUT
ACRST#
BITCLK
SDIN
SYNC
SDATA_OUT
RESET#
BITCLK
SDATA_IN
AC'97 Codec
22 ohm
22 ohm
SDIN2
10K ohm
Figure 2-54. AC'97 Link Example
2.5.2.2 Game/MIDI ports
The VT82C686A supports two direct game ports (Joystick A and Joystick B) and one MIDI port interface. An application circuit
of MIDI/Game port is shown in Figure 2-55. It is recommended to place all these RC components near the D-SUB connector.
D-SUB
(15-pin, 2-row)
Connector
VT82C686A
(South Bridge)
MIDI/Game Port
1
8
15
9
RD
2K ohm
VCC
JAX
JBY
JAY
JBX
JAB1
JBB1
JBB2
JAB2
MSI
MSO
VCC
RP
4.7K ohm
CP
0.02uF
CP
1000pF
Ferrite Bead
2
3
4
6
7
13
12
11
10
5
14
MIDI/Game Port Controller
Ferrite Bead
MIDI Serial
Input/Output
Game Port
Joystick A
Game Port
Joystick B
Figure 2-55. MIDI/Game Port Application Circuit