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Thread: Cyclone V DSP Cost 36x36 signed multiplication

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    Default Cyclone V DSP Cost 36x36 signed multiplication

    Hello.
    I have a simple design issue with the multiplication IP LPM_MULT.

    The Altera info page Arria V Cyclone V DSP Block tells me that I can implement one independent 36x36 multiplier in multiple-block mode with an amount of 2 DSP blocks. If I do so in an simple Quartus Project with Quartus Prime Version 17.1.0 Built 590 I get an amount of 3 DSP Blocks, 54 ALUTs and 27 ALMs needed. This is deviant from the used FPGA. For reference: Cyclone V 5CSEBA5U23C7.

    All Analysis & Synthesis Settings and also all Fitter Settings are set to default values (it's a new project with this IP and a vhdl file)

    The Resource Utilization by Entity report tells me that 3 DSP blocks are used for this multiplication instead of 2. I've tested every option of the IP with no effect to reach the 2 DSP blocks.

    Has anyone a hint or idea what is going wrong here?

    Thanks in advance.
    Last edited by mneubert; April 26th, 2018 at 04:15 AM.

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