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ADSP-21489 Flash Boot, MCU reprogram, I2C comms.

Question asked by am2 on Apr 29, 2016
Latest reply on May 3, 2016 by Madhuri

We want ADSP-21489KSWZ-3A to always boot from serial flash such as M25P16, then occasionally have MCU reprogram this serial flash (DSP can be in reset).  What are best methods to do this? Maybe 4-wire MUX chip to change the SPI connections.  We prefer to avoid MCU Host boot (SPI slave boot).


Also when DSP is running, we want 2-way communication with DSP. Can this be done by I2C?
1) MCU send DSP commands like Volume Up/Down or change filter coefficients. 
2) MCU read DSP information like what is average voltage at the tweeter.