Specifications

20 x 24 Independent Multiplier
Figure 3-7: One 20 x 24 Independent Multiplier Mode per Variable Precision DSP Block for Cyclone V Devices
In this mode, the result can be up to 52 bits when combined with a chainout adder or accumulator.
Input Register Bank
Multiplier
x
Result[43..0]
dataa_b0[19..0]
dataa_a0[23..0]
20
24
44
Variable-Precision DSP Block
Output Register Bank
27 x 27 Independent Multiplier
Figure 3-8: One 27 x 27 Independent Multiplier Mode per Variable Precision DSP Block for Cyclone V Devices
In this mode, the result can be up to 64 bits when combined with a chainout adder or accumulator.
Input Register Bank
Multiplier
x
Result[53..0]
dataa_b0[26..0]
dataa_a0[26..0]
27
27
54
Variable-Precision DSP Block
Output Register Bank
Independent Complex Multiplier Mode
The Cyclone V devices support the 18 x 19 complex multiplier mode using two Cyclone V variable-precision
DSP blocks.
Figure 3-9: Sample of Complex Multiplication Equation
The imaginary part [(a × d) + (b × c)] is implemented in the first variable-precision DSP block, while the
real part [(a × c) - (b × d)] is implemented in the second variable-precision DSP block.
Altera Corporation
Variable Precision DSP Blocks in Cyclone V Devices
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3-13
20 x 24 Independent Multiplier
CV-52003
2013.05.06