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YMF715E
May 21, 1997
-21-
6. DAC interface
OPL3-SA3 supports two types of DAC interface format. One is the conventional DAC interface format
(very common for the consumer audio product) for OPL4-ML/ML2. Another is the I
2
S format for
Zoomed Video port. These two types of the formats are shown in the following Fig.6-1, 2.
7. 3D Enhanced Control
OPL3-SA3 integrates the 3D enhanced controller including all the analog components in conventional
systems. Wide, bass, and treble controls are available via SA3 control register, index 14h, 15h, 16h.
One of the four 3D Enhancement modes can be selected according to the frequency response of the
speaker. These are controlled by SA3 control register, index 02h D5, D4 bit (YMODE1-0).
YMODE1 YMODE0 3D Enhancement mode Target speaker Speaker size
0 0 Desktop mode Standard speaker 5 ~ 12cm
0 1 Notebook PC mode (1) Small speaker 3cm
1 0 Notebook PC mode (2) Smaller speaker 1.5cm
1 1 Hi-Fi mode Hi-Fi speaker 16 ~ 38cm
Following diagram(Fig.7-1) shows the 3D enhanced controller sub-system.
010123456789101115 14 13 12 0123456789101115 14 13 12
BCLK
SIN
LRCK
Fig.6-1 Conventional DAC Interface Format for OPL4-ML/ML2
Left Channel Ri
g
ht Channel
0123456789101115
Ri
g
ht ChannelLeft Channel
14 13 12 0123456789101115 14 13 12
BCLK
SIN
LRCK
Fig.6-2 I
2
S Format for Zoomed Video Port
Fig.7-1 3D Enhanced Control Block Diagram
Yamaha
3D Enhanced
Controller
(analog components)
{
}
{
MIC,LINER,
AUX1R,AUX2R,
MIN,SBR,WSS_PBR
Rch
Lch
to Hardware
Volume Control
MIC,LINEL,
AUX1L,AUX2L,
MIN,SBL,WSS_PBL