| 内核的部分都没有视频教程，只有文字表达，后面的外设跟驱动什么的再看视频教程吧，这一篇简单说说MSA。
MSA全称Multiply-Accumulators，看图说话：
The two multipliers (MAC0 and MAC1) perform fixed-point multiplication and multiply and accumulate operations.
Two identical MACs
- Each can perform fixed point multiplication and multiply-and-accumulate operations on 16-bit fixed point input data and outputs 32-bit or 40-bit results depending the destination.
Functions
- Multiplication
- Multiply-and-accumulate with addition (optional rounding)
- Multiply-and-accumulate with subtraction (optional rounding)
- Dual versions of the above
Features
- Saturation of accumulator results
- Optional rounding of multiplier results
下一章是SHIFTER，全称：BARREL-SHIFTER
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