The ALC is an bit, full duplex AC’97 compatible stereo audio CODEC designed for PC multimedia systems, including host/soft audio and AMR/CNR. Description, AC’97 Audio Codec. Company, Realtek Semiconductor Corporation. Datasheet, Download ALC datasheet. Quote. Find where to buy. Quote. Avance Logic, Inc. ALC AVANCE LOGIC, INC. SINGLE CHIP SIX CHANNEL AC’97 AUDIO CODEC ALC 1. Features.

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The ALC will return any uninstalled bits or registers with 0 for the read operation. Sample Frequency in channel status When this register is written, the bit values that come in on AC-Link will have no effect on read only bits and bit Power down Mixer Vref still on PR1 0: Bit 8 controls the mic selector.

ALC Datasheet, PDF – Alldatasheet

Read as 0 Depth control DP[ Note that the 3D bit in the general purpose register bit 13 must be set to 1 to enable this function.


Enable Reserved Bit 13 is used to turn on 3D effects in both front and surround path.

Power down Mixer Vref off PR2 fatasheet The written data is ignored. Combined rise or fall plus flight times are provided for worst case scenario modeling purpose. And there is no gain for MX This register used to control the master volume of LFE and center output. This register used to control the master volume of surround output. Each step in bits Bit 2 is used to select the clock source for the ALC Reading unimplemented registers will also return a 0.

Mono output with 5-bit volume control.

Each step on the left and right channels correspond to 1. Set GPIO0 as input pin.

Stereo output with 5-bit volume control. Not yet Analog Mixer Status 1: Each step in bit 6 corresponds to a magnification of 20dB increase in volume. The first three codes have been assigned by Microsoft for Plug and Play definitions.

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The clock source is Finally, internal PLL circuits generate required timing signals, eliminating the need for external clocking devices. MX38 is the master volume control of surround output.


GPIO1 is driven low by external device input. For this reason, when 6th bit is written by 1, it is equivalent to writing low 5-bit with 1. Drive GPIO0 as low.

Mono output is the same data sent on all output channels. Bit 9 allows selection of mono output. A transaction which polarity depends on MX See table under Section 6. Intel Pentium 4 Proces Drive GPIO0 as high. If validity control is set MX3A. Register Write register indexed 00h Reset all registers to their default values.