Yamaha OPL3-SA3 Yamaha 3D Enhanced Controller, DAC interface, 7. 3D Enhanced Control, YMF715E

YMF715E

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	15 14 13 12 11 10	9	8	7	6	5	4	3	2	1	0	15 14 13 12 11 10	9	8	7	6	5	4	3	2	1	0
			Left Channel											Right Channel
LRCK

Fig.6-1 Conventional DAC Interface Format for OPL4-ML/ML2

BCLK

SIN	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
						Left Channel																Right Channel

LRCK

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)

{ MIC,LINEL,

AUX1L,AUX2L,

MIN,SBL,WSS_PBL

Rch
		to Hardware
Lch	Volume Control
	}

Fig.7-1 3D Enhanced Control Block Diagram

May 21, 1997

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