DK-DEV-5SGXEA7N【PDF 47/527 页】KIT DEV STRATIX V FPGA 5SGXEA7

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SV51004

2013.05.06

Operational Modes

3-5

? Accumulator

? Chainout adder

Operational Modes

The Quartus II software includes megafunctions that you can use to control the operation mode of the

multipliers. After entering the parameter settings with the MegaWizard Plug-In Manager, the Quartus II

software automatically configures the variable precision DSP block.

Altera provides two methods for implementing various modes of the Stratix V variable precision DSP block

in a design — using the Quartus II DSP megafunction and HDL inferring.

The following Quartus II megafunctions are supported for the Stratix V variable precision DSP blocks

implementation:

?

?

?

?

LPM_MULT

ALTMULT_ADD

ALTMULT_ACCUM

ALTMULT_COMPLEX

Related Information

? Introduction to Megafunction User Guide

? Integer Arithmetic Megafunctions User Guide

? Floating-Point Megafunctions User Guide

? Quartus II Software Help

Internal Coefficient and Pre-Adder

Mode

18-bit

27-bit

Stratix V

The coefficient feature must be enabled when the pre-adder feature is enabled.

The coefficient feature and pre-adder feature can be used independently.

With pre-adder enabled:

? If the multiplicand input comes from dynamic input due to input limitations — the

input data width is restricted to 22 bits.

? If the multiplicand input comes from the internal coefficients — the data width of the

multiplicand is 27 bits.

Note: When you enable the pre-adder feature, all input data must have the same clock setting.

Accumulator

The accumulator feature is not available in multi-block modes.

Chainout Adder

You can use the output chaining path to add results from other DSP blocks.

Variable Precision DSP Blocks in Stratix V Devices

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