If statement verilogif-else语句
我正在尝试为BCD计数秒表编写一个模块。当我检查语法时,会出现如下错误:If statement verilogif-else语句,if-statement,verilog,hdl,If Statement,Verilog,Hdl,我正在尝试为BCD计数秒表编写一个模块。当我检查语法时,会出现如下错误: ERROR:HDLCompilers:26 - "../counter.v" line 24 expecting 'end', found 'else' ERROR:HDLCompilers:26 - "../counter.v" line 25 unexpected token: '=' ERROR:HDLCompilers:26 - "../counter.v" line 25 unexpected token: '+
ERROR:HDLCompilers:26 - "../counter.v" line 24 expecting 'end', found 'else'
ERROR:HDLCompilers:26 - "../counter.v" line 25 unexpected token: '='
ERROR:HDLCompilers:26 - "../counter.v" line 25 unexpected token: '+'
ERROR:HDLCompilers:26 - "../counter.v" line 25 expecting 'endmodule', found '1'
在我的代码中间。我不太确定错误来自何处,并尝试实现更多的begin/end,但这并没有掩盖问题。这是我目前的代码:
module BCDCount(en, clk, rst, direction, cTenths, cSec, cTS, cMin);
input en, clk, rst, direction;
output [3:0] cTenths, cSec, cTS, cMin;
reg [3:0] cTenths, cSec, cTS, cMin;
always @(posedge clk)
if(en)
begin
if(direction == 0)
if(cMin== 4'b 1001)
cMin <= 4'b 0000;
if(cTS == 4'b 0101)
cTS <= 4'b 0000;
cMin = cMin +1;
if(cSec == 4'b 1001)
cSec <= 4'b 0000;
cTS = cTS +1;
if(cTenths == 4'b 1001)
cTenths <= 4'b 0000;
cSec = cSec+1;
else
cTenths = cTenths +1;
else
cSec = cSec+1;
else
cTS = cTS + 1;
if(direction == 1)
if(cMin== 4'b 0000)
cMin <= 4'b 1001;
if(cTS == 4'b 0000)
cTS <= 4'b 1001;
cMin = cMin -1;
if(cSec == 4'b 0000)
cSec <= 4'b 1001;
cTS = cTS -1;
if(cTenths == 4'b 0000)
cTenths <= 4'b 1001;
cSec = cSec-1;
else
cTenths = cTenths -1;
else
cSec = cSec-1;
else
cTS = cTS - 1;
end
always @(posedge rst)
begin
cMin <= 0;
cTS <= 0;
cSec <= 0;
cTenths <= 0;
end
endmodule
模块BCD计数(en、clk、rst、方向、cTenths、cSec、cTS、cMin);
输入en、clk、rst、方向;
输出[3:0]cTenths,cSec,cTS,cMin;
注册号[3:0]cTenths、cSec、cTS、cMin;
始终@(posedge clk)
如果(英文)
开始
如果(方向==0)
如果(cMin==4'b 1001)
cMin根据您的缩进结构,这段代码看起来应该是这样的
...
if(cTS == 4'b 0101)
cTS <= 4'b 0000;
cMin = cMin +1;
if(cTenths == 4'b 1001)
...
编辑:
同样值得注意的是,您正在混合阻塞(=
)和非阻塞(您需要围绕每个if-else开始结束)。查看此链接中的最后一个示例:SO还将重置逻辑放在一个单独的always块中,这对RTL来说是一个很大的禁忌。它应该移动到一个always块中:always@(posedge clk,posedge rst)begin if(rst)开始/*在此重置代码*/end else begin/*此处顺序代码*/end end
...
if(cTS == 4'b 0101)
begin
cTS <= 4'b 0000;
cMin = cMin +1;
if(cTenths == 4'b 1001)
...
end
else
...