Will DSP module be call directly in nios2 C app?

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originally posted by markman@Apr 5 2006, 03:50 AM

we all known there're a number of 9*9 mutiplier dsp module in cycloneii device.

i build a nios2 system based on cycloneii and i wanna to call this 9*9 mutiplier in my nioseii c application, using * operator for simple,instead of using custom instruction.when i build this noisii system in spoc builder, i already set cpu to use embedded mutiplier.

is that enough? will i need others attention to realize what i want?

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Why would you want to use a custom instruction for multiplication?

The Nios2 already includes several mul(xxx) opcodes that calculate 32x32 multiplication. (see "Nios2 Processor Reference Handbook" chapter 8 "Instruction Set Reference")

And the compiler uses these opcodes when you write a (integer) multiplication in c.

And I think the "embedded multiplier" setting tells sopc builder to use DSP Blocks instead of logic elements to implement the multiplication opcodes.