这几天连续睡眠不足，实在看花眼了。
这段代码就是无法切换状态
麻烦帮我看看为什么进不到状态机里！！
module Controller(
//Inputs
reset,
clock_488,
frame_synch,
//Outputs
frame_load, //for Mux
shift, //for Mux and shift register
load, //for 8bit register
demux_sel, //for Demux
data_out_enb //for Demux
);
input reset, clock_488, frame_synch;
output frame_load, shift;
reg frame_load, shift;
output load;
reg load;
output [4:0] demux_sel;
reg [4:0] demux_sel;
output data_out_enb;
reg data_out_enb;
parameter S_idle = 4'b0001, S_sampling = 4'b0010, S_shifting = 4'b0100, S_dout = 4'b1000;
reg [3:0] state, next_state;
reg [2:0] ld_counter;
reg [7:0] sft_counter;
/*frame_synch or*/
always @(state) begin
case(state)
S_idle:
begin
frame_load = 0;
load = 0;
data_out_enb = 0;
ld_counter = 0;
sft_counter = 0;
shift = 0;
if(frame_synch)
next_state = S_sampling;
else
next_state = S_idle;
end
S_sampling: //就是进不去这里啊！！！波形激励都没问题啊!!!!!!
begin
frame_load = 1;
next_state = S_shifting;
end
S_shifting:
begin
shift = 1; //2 fanout, 1 for Mux , other for shiftRegister
demux_sel = sft_counter / 8; //decide which output tunnel is selected
//when the shift register is full, load it to the holding register
if(ld_counter == 7)
load = 1; //when load is set, the data is held into register and output to registers
// of Demux according to demux_sel
else
load = 0;
ld_counter = ld_counter + 3'b001;
//when the whole 256bit data was transported over, then begin next state
if(sft_counter == 255)
next_state = S_dout;
else
next_state = S_shifting;
sft_counter = sft_counter + 8'h01;
end
S_dout:
begin
shift = 0;
data_out_enb = 1;
next_state = S_idle;
end
default:
next_state = S_idle;
endcase
end
/*or posedge frame_synch*/
always @(posedge clock_488 or posedge reset) begin
if(reset)
state <= S_idle;
else
state <= next_state; //按说这句执行以后就可以跳进上面的状态机了，但是就是不进去！
end
endmodule
[此贴子已经被作者于2006-5-25 23:29:45编辑过] | 
