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Documents Memory requirements for booting a SigmaDSP with a microcontroller
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Memory requirements for booting a SigmaDSP with a microcontroller

Memory requirements for booting a SigmaDSP with a microcontroller by BrettG

In order to boot a SigmaDSP using a microcontroller, the program memory, parameter memory, and control registers must be written via the I2C/SPI control port. Each SigmaDSP has a different memory size and different control registers. Therefore, the amount of memory required to boot each will differ. Also, depending on the size of the program, the amount of memory required can vary. As a rule of thumb, it is a good idea to select a microcontroller with enough memory to satisfy the booting requirements for a completely full program and parameter memory, plus some extra space for the microcontroller's own program.

Below is a table showing the worst-case boot memory sizes for all SigmaDSPs. This assumes a completely full program and parameter memory, with the default list of control registers being programmed at boot time.

Processor Full Boot, kBytes
Full Boot, kBits
ADAU1761, ADAU1461 9.375 75.0
AD1940, AD1941 12.108 96.864
ADAU1701, ADAU1401, ADAU1401A 9.244 73.952
ADAU1702 6.684 53.472
ADAU1442, ADAU1445, ADAU1446 34.425 275.4
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