Intel® Arria® 10 Core Fabric and General Purpose I/Os Handbook

ID 683461
Date 1/21/2022
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3.4.9. Double Accumulation Register for Fixed-Point Arithmetic

The double accumulation register is an extra register in the feedback path of the accumulator. Enabling the double accumulation register causes an extra clock cycle delay in the feedback path of the accumulator.

This register has the same CLK, ENA, and ACLR settings as the output register bank.

By enabling this register, you can have two accumulator channels using the same number of variable precision DSP block. This is useful when processing interleaved complex data (I, Q).