YMF715E Datasheet, PDF (21/54 Pages) YAMAHA CORPORATION – OPL3 Single-chip Audio System 3

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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 I²S format for
Zoomed Video port. These two types of the formats are shown in the following Fig.6-1, 2.
BCLK
SIN 1 0
LRCK
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Left Channel
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Right Channel
BCLK
Fig.6-1 Conventional DAC Interface Format for OPL4-ML/ML2
SIN
LRCK
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Left Channel
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Right Channel
Fig.6-2 I²S Format for Zoomed Video Port
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.
MIC,LINER,
AUX1R,AUX2R,
MIN,SBR,WSS_PBR
Yamaha
3D Enhanced
Controller
(analog components)
Rch
Lch
} to Hardware
Volume Control
MIC,LINEL,
AUX1L,AUX2L,
MIN,SBL,WSS_PBL
Fig.7-1 3D Enhanced Control Block Diagram
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May 21, 1997