ARM主要是做控制的,但我一直没找到合适的集成EMAC+PHY,ADC,USB外设的DSP,OMAP单价太高,不太适合成本敏感型,或者能帮推荐吗?
ARM主要是做控制的,但我一直没找到合适的集成EMAC+PHY,ADC,USB外设的DSP,OMAP单价太高,不太适合成本敏感型,或者能帮推荐吗?
你可以考虑使用Cortex-M4系列的MCU，它内部集成了FPU，框图如下：
看TI对其M4的描述：
The new Cortex-M4 expands the instruction offering of the Cortex-M3 by adding digital signal processing
(DSP) extensions and single instruction, multiple data (SIMD) instructions. The Stellaris LM4F series also
includes the floating point option (the “F” in the Cortex-M4F) across the entire offering of LM4F products.
The DSP operations of the Stellaris LM4F series include single-cycle 32-bit or dual 16-bit multiply-accumulate
(MAC) instructions and saturating arithmetic instructions. Optimized SIMD instructions can perform
four 8-bit or two 16-bit arithmetic operations in a single cycle and are therefore very effective at performing
arithmetic operations on large arrays of data. The hardware divide logic produces a result in between 2 and
12 clock cycles. Together, these instructions add DSP-like capability to a responsive controller core.
The single precision floating-point instructions are compliant with the IEEE 754 standard and include
functions such as square root and a fused MAC that enable higher precision. Numerous data type conversions
are available, speeding transitions between domains.
Besides providing a significant performance increase for math-intensive operations, floating-point support
greatly simplifies the implementation and programming of floating-point routines. It is not uncommon for
a customer to spend one week developing a digital filter then spend another month converting the filter to
a fixed-point implementation to ensure it is both precise and stable. This development time is not required
when programmers can program their filters in the native floating-point format.
可以看到它在DSP方面还是有很大优势的。功能更强劲，功耗更低，看起来很诱人。可以参考
