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Altera_Forum's avatar
Altera_Forum
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9 years ago

Resource usage for Arria 10 DSP performing Multiply Add

I want to implement "Multiply Add" operations using single precision floating point, and I'm considering the DSPs in Arria 10.

I'm trying to figure out the following:

- can we multiply and add in the same DSP, or do we need two DSPs?

- if yes, what will the latency be?

I found the resource utilization and latency for multiplication and addition separately here :

https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/ug/ug_altfp_mfug.pdf, chapter "ALTERA_FP_FUNCTIONS Resource Utilization and Performance"

which states :

Add : Latency = 4, DSP = 1

Multiply : Latency = 3, DSP = 1

Steffen

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    9 years ago

    Hi Steffen, you can, it has a latency of 4 cycles and you can access it using the multiply add which is available int he drop down menu in altera_fp_functions