我正在尝试从测试平台文件中调用接口文件中定义的任务。 任务定义为
task master_monitor(
output bit [ADDR_WIDTH-1:0] addr,
output bit [DATA_WIDTH-1:0] data,
output bit we
);
while (!cyc_o) @(posedge clk_i);
while (!ack_i) @(posedge clk_i);
addr = adr_o;
we = we_o;
if (we_o) begin
data = dat_o;
end else begin
data = dat_i;
end
while (cyc_o) @(posedge clk_i);
endtask
在我的测试平台中,接口被实例化为wb_bus,我尝试通过以下方式调用任务:
wire [WB_DATA_WIDTH-1:0] dat_wr_o;
wire [WB_DATA_WIDTH-1:0] adr;
wire we;
initial
begin
repeat(10) begin
wb_bus.master_monitor(adr, dat_wr_o, we);
end
end
当我在 modelim 上模拟时,我最终会遇到以下错误:
** Error: (vsim-3047) ../testbench/top.sv(52): actual value for formal 'data' of 'master_read' must be assignable.
# Time: 0 ps Iteration: 0 Instance: /top File: ../testbench/top.sv
# ** Error: (vsim-3047) ../testbench/top.sv(53): actual value for formal 'we' of 'master_monitor' must be assignable.
# Time: 0 ps Iteration: 0 Instance: /top File: ../testbench/top.sv
# ** Error: (vsim-3047) ../testbench/top.sv(53): actual value for formal 'data' of 'master_monitor' must be assignable.
# Time: 0 ps Iteration: 0 Instance: /top File: ../testbench/top.sv
# ** Error: (vsim-3047) ../testbench/top.sv(53): actual value for formal 'addr' of 'master_monitor' must be assignable.
# Time: 0 ps Iteration: 0 Instance: /top File: ../testbench/top.sv
我是否以正确的方式传递变量?有人可以帮助我吗?
您不能像adr
那样将有线信号传递到任务的输出范围。将它们更改为 logic
,或者创建传递给任务参数的中间变量,然后将它们assign
到线路。