Arria® V Device Handbook: Volume 1: Device Interfaces and Integration
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3.6.2.3. 18 x 25 Complex Multiplier
Arria® V GZ devices support an individual 18 x 25 complex multiplication mode.
A 27 x 27 multiplier allows you to implement an individual 18 x 25 complex multiplication mode with three variable precision DSP blocks only. The pre-adder feature is automatically enabled for you to implement an individual 18 x 25 complex multiplication mode efficiently.