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LM4560VJD データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM4560VJD データシート(HTML) 1 Page - National Semiconductor (TI) |
1 / 54 page LM4560 Advanced PCI Audio Accelerator General Description LM4560 is an advanced PCI audio accelerator providing full legacy compatibility, wavetable synthesis, DirectMusic, Di- rectSound, and DirectSound3D on a single chip for the high- performance, cost-sensitive consumer market. It supports Sound Blaster functionality and is fully PC98 compliant. The LM4560 integrates a 64-voice wave table engine with per voice effect processing capability. It supports the upcom- ing Microsoft™ DirectMusic API and is fully compatible with DLS Level 1 (downloadable samples) specification. The LM4560 is optimized for Microsoft Windows™ 98 and Win- dows NT5.0 WDM streaming architecture with re-routable end-point support. The LM4560 includes DirectSound3D ac- celeration hardware for ITD (Interaural Time Difference), IID (Interaural Intensity Difference), Pan, Delay, and Doppler hardware. The LM4560 supports Sound Blaster Pro/16 DOS games while improving gaming audio quality. The LM4560 supports both the legacy analog gameport and a Digital Enhanced Game Port. When coupled with DirectInput™ driver, the Digi- tal Enhanced Game Port can save up to 12% of the CPU overhead nominally required by a conventional analog game port. The LM4560 employs a high precision 26-bit digital mixer, providing an accurate 20-bit output and higher than 90 dB signal-to-noise ratio when used with high quality AC97 Rev 1.03 and Rev 2.0 codecs. The LM4560 is designed with aggressive power manage- ment. It is PCI Bus Power Management Interface (PPMI 1.0)-compliant. The LM4560 supports multiple Rev 2.0 AC97 codecs, which are useful for notebook docking systems. With a low power, 3.3V process and a space conscious 100 TQFP package, the LM4560 is also well suited for Notebook systems. In summary, the LM4560 provides a balanced combination of features and performance to the end-user. By combining PCI bus mastering for DirectSound acceleration, Hardware Wave table synthesizer, Digital Enhanced Game Port and DirectSound 3D audio acceleration. It delivers high perfor- mance, high quality audio, high-end features with efficient power management in a space-efficient 100 TQFP package. Features n PCI 2.1-compliant with Bus Mastering optimized for multiple stream operation n On-chip per voice cache minimizes PCI bandwidth n Up to 20X improvement over ISA DMA on PCI bus bandwidth utilization Advanced Wavetable Synthesizer n Wavetable synthesis with 64-voices polyphony, which supports all combinations of stereo/mono, 8-/16-bits, and signed/unsigned samples n Per channel volume, pitch shift, left/right pan, tremolo, vibrato and envelope control (32 channels in hardware) n Per channel effect process ing and effect volume control for reverb, chorus, and echo n DLS1-compliant Downloadable Samples support Legacy Compatibility n Legacy game audio support with SoundBlaster Pro/16 compatibility on the PCI bus n Legacy DMA support on PCI Bus with DDMA-enabled or standard (non-DDMA) PCI chipsets n FM through realtime FM-to-wavetable conversion n MPU-401 compatible UART for external or internal synthesis n General MIDI/GS command interpretation for wavetable & effect synthesis High Quality Audio and AC97 Support n CD quality audio with higher than 90 dB signal-to-noise ratio using an external high quality AC97 codec n AC97 support with full duplex, independent sample rate converter for audio recording and playback n On-chip sample rate converter ensures all internal operation at 48 kHz n High precision internal 26-bit digital mixer with 16- and 20-bit digital audio output Advanced Streaming Architecture n Microsoft WDM Streaming architecture compliant and “Re-routable endpoint” support n Three stereo capture channels n AC97 stereo recording channel through AC-link DirectSound 3D n 64-voices DirectSound channels n 32-voices DirectSound3D accelerator with IID, ITD, and Doppler effects on 3D positional audio buffers n DirectSound accelerator for volume, pan, and pitch shift control on streaming or static buffers Telephony & Modem n Full duplex speaker phone with AC97 2.0 audio-modem codec n Fax-modem with host based software Extras n Fully Plug and Play PCI controller and software n Digital Enhanced Game port enables an analog joystick to emulate digital joystick performance using the National Semiconductor-provided DirectInput driver. This eliminates up to 12% CPU overhead wasted on joystick polling. TRI-STATE® is a registered trademark of National Semiconductor Corporation. Microsoft™ is a trademark of Microsoft Corporation. Windows® is a registered trademark of Microsoft Corporation. DirectInput™ is a trademark of Microsoft Corporation December 1998 © 1998 National Semiconductor Corporation DS100910 www.national.com |
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