It can also support latest Intel Pentium 4/Pentium D, Prescott CPUs, up to 800MHz FSB, DDR400, two serial ATA and 8 USB 2.0 ports for features. Power support: Digital: 3.3V Analog: 3.Specifications: P21G is one of the most advance and unique modules of PCCHIPS production.Supports 48KHz S/PDIF output, compatible with AC'97 Rev 2.3 specifications.Power management and enhanced power saving features.External Amplifier Power Down (EAPD) capability.Built-in 50mW/20ohm amplifier for both Front-out and Surround-Out.LINE input shared with surround output MIC input shared with Center and LFE output.Dedicated Front-MIC input for front panel applications (software selectable).Two analog line-level mono inputs: PCBEEP, PHONE-IN.Three analog line-level stereo inputs with 5-bit volume control, LINE_IN, CD, AUX.Integrated PCBEEP generator to save buzzer.14.318MHz -> 24.576MHz PLL to eliminate crystal.Front-Out, Surround-Out, MIC-In and LINE-In Jack Sensing.Compatible with AC'97 Rev 2.3 specifications.16-bit Stereo full-duplex CODEC with 48KHz sampling rate.Meets Microsoft WHQL/WLP 2.0 audio requirements.Meets performance requirements for audio on PC99/2001 systems.In addition, the ALC655 is embedded with an impedance sensing capability to detect when a device has been connected to input or output jacks. Bundled Windows series drivers (98/ME/NT/2000/XP), EAX/Direct Sound 3D/ I3DL2/A3D compatible sound effect utilities (supporting Karaoke, 26 types of environment sound emulation, 10-band equalizer), HRTF 3D positional audio and Sensaura ™ 3DPA (optional) provide an excellent entertainment package and game experience for PC users. The ALC655 CODEC supports host/soft audio from Intel ICHx chipsets as well as audio controller-based VIA/SIS/ALI/AMD/nVIDIA/ATI chipsets. The ALC655 also supports S/PDIF input and output for easy connection of PCs to consumer electronic products, such as AC3 decoders/speakers and mini-disk devices. An integrated 50mW/20ohm headset audio amplifier for Front-Out and Surround-Out, a 14.318MHz -> 24.576MHz PLL, and a PCBEEP generator cut BOM costs. The digital interface circuitry of the ALC655 CODEC operates from a 3.3V power supply for use in notebook and PC applications. The ALC655 CODEC provides three pairs of stereo outputs with 5-bit volume control, a mono output, and multiple stereo and mono inputs, along with flexible mixing, gain, and mute functions to provide a complete integrated audio solution for PCs. The ALC655 incorporates proprietary converter technology to meet performance requirements for PC99/2001 systems. 2.3 compatible six-channel audio CODEC designed for PC multimedia systems, including host/soft audio and AMR/CNR-based designs. The ALC655 is a 16-bit, full-duplex AC'97 Rev.
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