ESS ESS978 free download

File name ESS978.pdf

ES978 Expansion Audio Mixer Product Brief DESCRIPTION The ES978 is an Expansion Audio Mixer for use in a docking station. It provides audio resources to an expansion unit with which a portable unit using the ES1878 AudioDrive® is docked. The ES978 eliminates the need for bulky discrete components in a docking station. The master volume control of the ES978 is slaved to the ES1878 mixer when the two are docked. Separate record and playback mixers allow for full-duplex operation between the ES1878-based portable unit and the ES978-based docking station. A 4-wire expansion analog bus and a 2-wire serial control bus connect the ES1878 and ES978. This connection is used for a hotdocking interface. The 2-wire digital status and data communication between the ES978 and ES1878 supports register shadowing. The ES978 registers are continually updated with worst case latency being approximately 140 µsec. The ES978 offers several advantages, such as a digital joystick interface which reduces host overhead for the dual game port, a selectable interface for either ES689/ES690 wavetable or an I S Zoom Video port for MPEG audio, as well as 8 general-purpose inputs and 8 general-purpose outputs for flexible board design. These general purpose I/O can be slaved with the corresponding pins of the ES1878. 2 FEATURES Interfaces to ES1878 AudioDrive® Chip No bus interface required Simple hot-docking interface Supports register shadowing between ES978 and ES1878 Supports two pairs of on-chip analog differential signals for audio I/O with portable audio mixer and a 2-pin serial control bus High integration eliminates the need for discrete components in the docking station Inputs and Outputs Supports up to 8 general-purpose inputs and 8 general-purpose outputs Selectable interface for either the ES689/ES690 wavetable or I2S Zoom Video MIDI serial port compatible with MPU-401 UART mode ESS high performance dual game port with hardware timing Mixer Features 5-channel stereo mixer: line, CD audio, auxiliary line, input from ES1878 portable unit, a selectable input from either the ES689/ ES690 or the I2S Zoom Video port, plus a mono input for microphone Programmable 6-bit logarithmic master volume control volume up, down, and mute Advanced power management supports automatic power-down. As long as the ES1878 portable unit and the ES978 docking station are connected, power-down states on both units are executed concurrently. Whenever the docking station is not connected, the ES978 remains in power-down mode. ES978 is available in an industry-standard 100-pin Plastic Quad Flat Pack (PQFP) package. 3-button hardware volume control with switch inputs for master Master volume control: when docked, mixer in ES978 docking station is slaved to mixer in ES1878 notebook Symmetrical record and playback mixers for simultaneous fullduplex operation ES978 FUNCTIONAL BLOCK DIAGRAM I2S Z V P o r t / ES6 89 /ES6 90 Wavetable Serial Port Expansion Au d io B u s t o/ fr