Vivado High-Level Synthesis

Accelerates IP Creation by Enabling C, C++ and System C Specifications


Advanced algorithms used today in wireless, medical, defense, and consumer applications are more sophisticated than ever before. Vivado® High-Level Synthesis included as a no cost upgrade in all Vivado HLx Editions, accelerates IP creation by enabling C, C++ and System C specifications to be directly targeted into Xilinx programmable devices without the need to manually create RTL. Supporting both the ISE® and Vivado design environments Vivado HLS provides system and design architects alike with a faster path to IP creation by :

  • Abstraction of algorithmic description, data type specification (integer, fixed-point or floating-point) and interfaces (FIFO, AXI4, AXI4-Lite, AXI4-Stream)
  • Extensive libraries for arbitrary precision data types, video, DSP and more… see the below section under Libraries
  • Directives driven architecture-aware synthesis that delivers the best possible QoR
  • Fast time to QoR that rivals hand-coded RTL
  • Accelerated verification using C/C++ test bench simulation, automatic VHDL or Verilog simulation and test bench generation
  • Multi-language support and the broadest language coverage in the industry
  • Automatic use of Xilinx on-chip memories, DSP elements and floating-point library


The following libraries are included with Vivado HLS:

Name Description
Arbitrary Precision Data Types Integer and fixed-point (ap_cint.h, ap_int.h and systemc.h) 
HLS Stream Models for streaming data structures.  Designed to obtain best performance and area (hls_stream.h)
HLS Math Extensive support for the synthesis of the standard C (math.h) and C++ (cmath.h) math libraries.  The support includes floating point and fixed-point functions: abs, atan, atanf, atan2, atan2, ceil, ceilf, copysign, copysignf, cos, cosf, coshf, expf, fabs, fabsf, floorf, fmax, fmin, logf, fpclassify, isfinite, isinf, isnan, isnormal, log, log10, modf, modff, recip, recipf, round, rsqrt, rsqrtf, 1/sqrt, signbit, sin, sincos, sincosf, sinf, sinhf, sqrt, tan, tanf, trunc

The Vivado high-level synthesis tool also supports the Vitis performance-optimized libraries available on Github with out-of-the-box acceleration with minimal to zero-code changes to your existing applications.  These common Vitis accelerated-libraries include advanced Math, Statistics, Linear Algebra, and DSP to offer core functionalities for a wide range of applications.  These libraries offer out-of-the-box acceleration for workloads like Vision and Image Processing with OpenCV, Quantitative Finance, Database, and Data Analytics, Data Compression and more...



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