Encore SIM EDITOR SOFTWARE Guia do Utilizador descarregar pdf (Página 362)

100

101

15-10

Expressions

Trigger Types

The trigger expression can specify the negative edge, positive edge,

or both edges of a signal to trigger on. To specify the edge to trigger

on, the trigger expression should include the appropriate event-

control statement (see

Table 15-1, Trigger Expressions).

Table 15-1 Trigger Expressions

Trigger Expression Signal Edge

clkt

Trigger on both negative and positive edge.

Verilog:

negedge clkt

VHDL:

clk’event and clk=’0’

Trigger on negative edge.

Verilog:

posedge clkt

VHDL:

clk’event and clk=’1’

Trigger on positive edge.

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