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2-38 Service Guide
2.4 NMA1
NMA1 is a single audio chip that integrates OPL3 FM and its DAC, 16bit Sigma-delta CODEC, MPU401
MIDI interface, and a 3D enhanced controller including all the analog components which is suitable for
multi-media application. This LSI is fully compliant with Plug and Play ISA 1.0a, and supports all the
necessary features, i.e. 16bit address decode, more IRQs and DMAs in compliance with PC’96. This LSI
also supports the expandability, i.e. Zoomed Video and Modem interface in a Plug and Play manner, and
power management(power down, power save, partial power down, and suspend/resume) that is
indispensable with power-conscious application.
2.4.1 Features
• Built-in OPL3 FM Synthesizer
• Supports Sound Blaster Game compatibility
• Supports Windows Sound System compatibility
• Supports Plug&Play ISA 1.0a compatibility
• Full Duplex operation
• Built-in MPU401 Compatible MIDI I/O port
• Built-in the 3D enhanced controller including all the analog components, Supports 16-bit
addresss decode, Port for external Wavetable synthesizer
• Hardware and software master volume control
• Supports monaural input
• 24 mA TTL bus drive capability
• Supports Power Management(power down, power save, partial power down, and
suspend/resume)
• +5V/+3.3V power supply for digital, 5V power supply for analog
• 100 pin SQFP package