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单项选择题

下列Moore型状态机采用Verilog语言说明部分正确的是()。

A.parameter [2:0]s0=0,s1=1,s2=2,s3=3,s4=4;reg [2:0]current_state,next_state
B.parameter [1:0]s0=0,s1=1,s2=2,s3=3,s4=4;reg [1:0]current_state,next_state
C.TYPE FSM_ST IS (s0,s1,s2,s3,s4);SIGNAL current_state,next_state:FSM_ST
D.typedef enum {s0,s1,s2,s3,s4}type_user;type_user current_state,next_state