TIGER560 Datasheet, PDF (18/37 Pages) List of Unclassifed Manufacturers – USB Controller for Low Cost VoIP solutions

Tiger560
Advance Information
Tiger560 mode (Audio class device): Serial port signals
The FSC should be an 8Khz clock. Within one FSC period, 8 bits of µ-law audio data are
transmitted and received. The channel/slot number can be programmed through productID[10].
When productID[10] is set to 0 the first 8bits after the frame sync is used, when productID[10] is
set to 1 the second 8bits is used.
FSC
125uS
DIN
DOUT
8bit u-law audio data stream
Tiger560 mode (Audio class device): Serial port data transfer
Tiger560 USB Endpoint 6 and Endpoint 7 are used for the audio data transfer. 16-bit PCM audio
format is supported. Each USB isochronous transfer will carry 8 samples with 16 bytes of data.
Endpoint 6 is for wave-out device and Endpoint 7 is for wave-in device.
The Tiger560 translates audio samples between 8bit µ-law and 16-bit PCM format. Each audio
stream direction has a USB feature unit to control the volume. Tiger560 will perform hardware
volume scaling based on the USB SET_CUR volume command. The mute control is supported
for both the speaker and microphone audio streams.
Auto audio feedback comparison logic will monitor the input audio stream. When the value
exceeds the set reference value, it will automatically mute the audio output stream to prevent
audio feedback or echo. The reference value for the muting is controlled through internal registers
0x2f and 0x30.
Revision 1.1 released on 2/20/01
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