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ECM-3711 Series
18 ECM-3711 Series User’s Manual
• Plug and Play functions with steerable PCI interrupts
The PnP function allows complete steerability of PCI interrupts and integrated peripheral
interrupts to system interrupt channel. One additional steerable interrupt channel is
provided to allow plug and play and re-configurability of on-board peripherals for Windows
family compliance.
The VT8251 also enhances the functionality of standard integrated peripherals. The
integrated interrupt controller supports both edge and level triggered interrupts channel by
channel. The integrated DMA controller supports type-F DMA in addition to standard ISA
DMA modes. Compliant with the PCI v2.3 specification, the VT8251 supports delayed
transactions so that slower internal ISA peripherals do not block the traffic of the PCI bus.
Special circuitry is built in to allow concurrent operation without causing deadlock in a
PCI-to-PCI bridge environment.
1.6.3 VIA VT1616 AC’97 Codec
VIA Technologies’ VT1616TM 18-bit audio codec conforms to the AC’97 2.2 and S/PDIF
output specifications. The VT1616 integrates Sample Rate Converters on all channels and
can be adjusted in 1Hz increments. There is a provision in hardware for down-mixing the 6
channels into stereo when only two end points are available. The analog mixer circuitry
integrates a stereo enhancement to provide a pleasing 3D surround
sound effect for stereo media. This codec is designed with aggressive power management
to achieve low power consumption. When used with a 3.3V analog supply, power
consumption is further reduced. The primary applications for this part are desktop and
portable personal computers multimedia subsystems. However, it is suitable for any
system requiring 6-channel audio output for home theater systems at competitive prices.
• AC’97 2.2 S/PDIF extension compliant codec
• 18-bit, 6 channel DAC outputs
• 1Hz resolution VSR on all channels
• Integrated IEC958 line driver for S/PDIF
• S/PDIF compressed digital or LPCM audio out
• Hardware downmixoption to 2 channels
• 3D stereo expansion for simulated surround
• 18-bit independent rate stereo ADC
• 4 stereo, 2 mono analog line-level inputs
• Second line-level output with volume control
• External Audio Amplifier Control
• Low Power consumption mode
• Exceeds MicrosoftR WHQL logo requirements
• 3.3V digital, 3.3 or 5V analog power supply
• 48-pin LQFP small footprint package