Asynchronous VHDL Extensions Related to VHDL-200x

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Asynchronous VHDL ExtensionsRelated to VHDL-200x

• Joshua JohnsonFTL Systems
• joshua.johnson_at_ftlsys.com
• (John Willis for Joshua Johnson)

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Objectives

• Facilitate design of asynchronous andcombined
  clocked/clock-less systems (GALS)
• Current functional areas
• Assignment overloading
• Efficient skew control
• Sensitivity list flexibility
• Applicability to broad range of technology

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Status

• Non-IEEE VHDL extension effort underway for last
  18 months
• Numerous user companies involved fromcommercial
  and military sectors
• Specific availability to IEEE being
  explored(complicated by problems at IEEE)
• Active, well-funded effort