How to use the DSP48E multipliers? (FPGA)

Hello

I am currently implementing a gauss function generator high speed on a PXI-7841R. I need several fast multipliers to calculate the exponent, so I would like to make use of the DSP48E slices. I limited the operands into chunks of less than 18 and 25, but it seems that the DSP slices are not used in all cases. I have several integer and fixed-point-multipliers in my VI, but the only compilation report States 3 used DSP-slices. Can someone tell how to make their use of Labview. I thank.

Kind regards

Matthias

I'm still playing with the code, but here's an update.

I compiled the code you provided.

I have experienced this problem as well with reporting of XST.  It does not recognize using multipliers, as shown here:

======================

Synthesis of HDL

Macro statistics
# Multipliers: 2
25 x 18-bit multiplier: 2
# Adders/Subtractors: 53
17-bit adder                                          : 1
18-bit adder                                          : 1
20-bit addsub: 49
Subtractor 27 bits: 1
Subtractor 34 bits: 1
# Counters                                             : 7
16-bit down counter: 1

...

However, the final report does not show the multipliers are situated within a band of DSP48 but they are if they weren't it would take a stupid amount of tissue to implement.

Multiply it by constant (-1) is replaced by the logic, should in any case be a negate, that's why only 2 multipliers are used instead of 3 as planned on the pattern of high level.

Tags: NI Software

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