Specifications

18 x 18 or 18 x 19 Independent Multiplier
Figure 3-5: Two 18 x 18 or 18 x 19 Independent Multiplier Mode per Variable Precision DSP Block for
Cyclone V Devices
In this figure, the variables are defined as follows:
• n = 19 and m = 37 for 18 x 19 mode
• n = 18 and m = 36 for 18 x 18 mode
[(m-1)..0]
Multiplier
x
Multiplier
x
Input Register Bank
data_b1[(n-1)..0]
data_a1[17..0]
n
18
Variable-Precision DSP Block
data_b0[(n-1)..0]
data_a0[17..0]
n
18
m
[(m-1)..0]
m
Output Register Bank
18 x 25 Independent Multiplier
Figure 3-6: One 18 x 25 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
Result[42..0]
dataa_b0[17..0]
dataa_a0[24..0]
18
25
43
Variable-Precision DSP Block
Output Register Bank
x
Variable Precision DSP Blocks in Cyclone V Devices
Altera Corporation
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CV-52003
18 x 18 or 18 x 19 Independent Multiplier
3-12
2013.05.06