14
DSP
The Texas Instruments TMS320DA705 (U7000) is a floating-point Digital Signal Processor with internal ROM and
192kbytes of internal RAM. No external RAM is required or supported by this processor. The internal ROM
includes a boot loader algorithm that permits booting the custom application portion of the program code from a
variety of external devices. All audio processing, limiting, volume control, bass compensation, monitoring of the
thermal sensors, clip detection, transducer DC offset protection, ETAP command processing and response
generation are performed by the DSP.
DSP Clock
The 24.576MHz DSP clock is provided by U6000. The clock is applied prior to U6000 releasing the DSPRESET\
line.
DSP Reset
Reset for U7000 is controlled solely by the USB controller (U6000) through the DSPRESET\ signal applied to
U7000.14. The DSP is held in reset after power is applied until the USB controller has initialized its operation.
The DSP is also placed into reset by the USB controller just prior to its entering the stand-by operation mode.
Digital Signal Processor
USB Controller
To DSP
Pin 14
DSP
