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参数资料
| 型号： | YMF740C |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | DS-1L |
| 中文描述： | 的DS - 1公升 |
| 文件页数： | 30/44页 |
| 文件大小： | 224K |
| 代理商： | YMF740C |
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YMF740C
January 14, 1999
-36-
5. Hardware Volume Control
The hardware volume control determines the AC’97 master volume without using any software control using
the external circuit listed below.
Two pins, VOLUP# for increasing the volume and VOLDW# for decreasing the volume, are used.
1k
VOLDW#
VOLUP#
1k
1000p
Push SW
DS-1L provides a shadow register for the AC’97 master volume.
When the software accesses the AC’97
Master Volume, it is always reflected in the shadow register.
The value of the shadow register is incremented by 1.5dB on the rising edge of the signal input to the
VOLUP# pin.
If it is already set to the maximum value, it does not change.
The value set in the shadow
register automatically updates the AC’97 master volume register through the AC-Link.
The value of the shadow register is decremented by 1.5dB on the rising edge of the signal input to the
VOLDW# pin.
If it is already set to the minimum value, it does not change.
The value set in the shadow
register automatically updates the AC’97 master volume register through the AC-Link.
Also, when both VOLUP#, VOLDW# pins are at LOW level, the MUTE bit of the shadow address is enabled
and the Master Volume Mute bit of the AC’97 register is automatically set through the AC-Link.
When a
rising edge is detected on either VOLUP# or VOLDW#, the MUTE bit is reset through the AC-Link.
The
Master Volume is set to the value before the Mute.
If the AC-Link is BUSY (when controlling the register from the AC’97 Control Register), the value in the
shadow register is set to AC’97 on the next frame.
The AC’97 Control Register is set to BUSY in this case.
When the master volume changes or is muted due to VOLUP#, VOLDW#, an interrupt is generated at the
host.
The interrupt is used to notify the driver that the Master Volume has been changed from the outside.
相关PDF资料 |
PDF描述 |
|---|---|
| YMF743-S | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| YMF743 | AC97 Revsion2.1 Audio CODEC with Digital Audio I/F(AC97 2.1版音频编解码器（带数字音频接口）) |
| YMF744B | DS-1S |
| YMF752 | AC97 Rev2.1 Audio CODEC with SRC |
| YMF752-S | AC97 Rev2.1 Audio CODEC with SRC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| YMF740CV | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Industrial Control IC |
| YMF743 | 制造商:YAMAHA 制造商全称:YAMAHA CORPORATION 功能描述:AC’97 Revsion2.1 Audio CODEC with Digital Audio I/F |
| YMF743-S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Consumer IC |
| YMF744B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DS-1S |
| YMF744BR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Industrial Control IC |
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