IEC 61691-2:2001 is embodied in the Std_logic_1164 package package body. This standard is based on IEEE Std 1164-1993: Multivalue logic system for VHDL model interoperatibility.
ICS
35.240.50 IT applications in industry. Including design automation / Применение информационных технологий в промышленности. Включая автоматизацию проектирования