#SYNPLIFY PRO PREVENT CLOCK INFERENCE SOFTWARE#
Synthesis tools usually include similar packages for their implementation-defined attributes. All clocks in a single clock group are assumed to be related, and the Synplify software automatically calculates the relationship between the clocks. While we could declare the attributes ourselves in each design, using the standard package is more convenient. It just, connected the din0 and din1 with out putting any logic.
But as for as the 'FPGA Express' is concerned, it is working fine. so, if i increase the input data with 1:0 din to 255:0 din, it is obiviously put more logics and increase my critical path. The standard specifies a package of attribute declaration to be analyzed into the ieee library. 'Synplifypro' implementing in different way. Each element of the array is known as a word.
#SYNPLIFY PRO PREVENT CLOCK INFERENCE HOW TO#
We describe them here, as they are indicative of the kinds of attributes supported by tools. How to disable RAM inference in HDL using Synplicitys Synplify A RAM structure can be modeled as a 2-dimensional array of registers. In an effort to create at least a small amount of harmony, the IEEE 1076.6 synthesis standard defines a minimal set of synthesis attributes. We need to refer to a tool’s documentation to discover what attributes are supported and how to use them. This is possibly an aspect in which tools most widely diverge, since the attributes a given tool supports reflect the particular capabilities and synthesis algorithms implemented by the tool. These were the most current released versions available at the time this paper was written. Sometimes finer control of the synthesis process is needed ➔ one way in which we can do so is by including “attribute specifications” in our models to direct a synth.tool to infer hardware in particular ways.Īshenden 3rd, p659: Different synthesis tools support different attributes to specify different aspects of hardware inference and different aspects of target technologies. version 2012.06-SP4 and Synopsys Synplify-Pro version 2012.09-SP1.
Synthesis tools: can be told to optimize either speed or area
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