Hello Is there a way to define (in the logic level library: *.vbe files) and instantiate a Flip-Flop with Enable (using scmap)? Descriptions such as the following (in the tutorial file "dlxm_chip.vbe") do not work: VHDL : Error - bad usage of the 'stable' attribut *** Compilation aborted... trap_v : block (CKFRZ_S = '0' and not CKFRZ_S'STABLE and WENTVR_S = '1') begin TVR_R <= guarded RESULT_S; end block; Thanks in advance, -- Horacio Neto e-mail: hcn@inesc.pt INESC - Instituto de Engenharia de Sistemas e Computadores Rua Alves Redol, 9, 1000 Lisboa - PORTUGAL Phone: + 351 21 3100366 Fax: + 351 21 3145843