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S-DSP
From SnesLab
S-DSP in region D4 of the jwdonal schematic
The S-DSP is the digital signal processor. It produces audio for the DAC and is controlled by the S-SMP. It is clocked by X2.
It has 128 registers (DSPRAM) that can be manipulated by the SPC, some of which serve no hard-wired purpose and can be used as general-purpose RAM.
The highest sound frequency that the S-DSP can produce is 16kHz, because of the 32kHz rate that sample-points are output. [1]