Cooper LP800 Guia do Utilizador Página 444

  • Descarregar
  • Adicionar aos meus manuais
  • Imprimir
  • Página
    / 567
  • Índice
  • MARCADORES
  • Avaliado. / 5. Com base em avaliações de clientes
Vista de página 443
16
-
4 Di
g
ital Worst-Case Timin
g
Analysis
the duration of the timing ambiguity result that represents a
primitive’s output change.
For example, consider the model of a BUF device in the
following figure.
U5 BUF $G_DPWR $G_DGND IN1 OUT1 ; BUFFER model
+ T_BUF IO_STD
.MODEL T_BUF UGATE ( ; BUF timing model
+ TPLHMN=15ns TPLHTY=25ns TPLHMX=40ns
+ TPHLMN=12ns TPHLTY=20ns TPHLMX=35ns)
Fi
g
ure 16-1
Timing Ambiguity Example 1
The application of the instantaneous 0-1 transition at 5 nsec in
this example produces a corresponding output result. Given the
delay specifications in the timing model, the output edge occurs
at a MIN of 15 nsec later and a MAX of 40 nsec later. The region
of ambiguity for the output response is from 20 to 45 nsec (from
TPLHMN and TPLHMX values). Similar calculations apply to
a 1-0 transition at the input, using TPHLMN and TPHLMX
values.
20545
Vista de página 443
1 2 ... 439 440 441 442 443 444 445 446 447 448 449 ... 566 567

Comentários a estes Manuais

Sem comentários