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how to use sram to output arbitrary wave


1. I followed the steps of the picture, but the output waveform of DDS is not ideal. My data is 4095, which should be the maximum, but the output waveform is only about 200mv.

2. Spi communication is normal, but the value of sram read is not correct. If I write 0x7 in, only 0x4 will be read out, and bit0-1 will be set to zero.

3. Can you tell me what register should be configured to write data to sram and output sram stored waveform?