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The DSP48 Primitive - FIR with DSP48 Primitive Instantiations   After a break I will be resuming my weekly posts on The Art of FPGA Design. In the last posts we started looking at the DSP48 primitive, essentially a signed 27x18 multiplier which also includes a 27-bit pre-adder and a 3-input 48-bit post-adder. In older FPGA families like the 7-series the multiplier is 25x18, the pre-adder is 25-bits and the 48-bit post-adder has only two inputs. The DSP48 primitive also includes a lot of p ...

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