This manual describes Xilinx® Synthesis Technology (XST) support for HDL languages,Xilinx® devices, and constraints for the ISE software. The manual also discusses FPGA and CPLD optimization techniques and explains how to run XST from Project Navigator Process window and command line.This manual contains the following chapters and appendixes:
Introduction, provides a basic description of XST and lists supported
architectures.
HDL Coding Techniques, describes a variety of VHDL and Verilog coding techniques that can be used for various digital logic circuits, such as registers, latches, tristates, RAMs, counters, accumulators, multiplexers, decoders, and arithmetic operations. The chapter also provides coding techniques for state machines and black boxes.
FPGA Optimization, explains how constraints can be used to optimize FPGAs and explains macro generation. The chapter also describes the Virtex™ primitives that are supported.
CPLD Optimization, discusses CPLD synthesis options and the implementation details for macro generation.
Design Constraints, describes constraints supported for use with XST. The chapter explains which attributes and properties can be used with FPGAs, CPLDs, VHDL, and Verilog. The chapter also explains how to set options from the Process Properties dialog box in Project Navigator.
VHDL Language Support, explains how VHDL is supported for XST. The chapter provides details on the VHDL language, supported constructs, and synthesis options in relationship to XST.
Verilog Language Support, describes XST support for Verilog constructs and meta comments.
Mixed Language Support,describes how to run an XST project that mixes Verilog and VHDL designs.
Log File Analysis, describes the XST log file, and explains what it contains.
Command Line Mode, describes how to run XST using the command line. The chapter describes the xst, run and set commands and their options.
Appendix A, XST Naming Conventions, discusses net naming and instance naming
conventions.
