Quartus常见错误及警告分析

 

 

 

1 Warning: VHDL Process Statement warning at random.vhd(18): signal reset is in statement, but is not in  

 

sensitivity list

 

----没把singal放到process（）中

 

 

2 Warning: Found pins ing as undefined clocks and/or memory enables

 

Info: Assuming node CLK is an undefined clock

 

-=-----可能是说设计中产生的触发器没有使能端

 

 

3 Error: VHDL Interface Declaration error in clk_gen.vhd(29): interface object "clk_scan" of mode out  

 

cannot be read. Change object mode to buffer or inout.

 

------信号类型设置不对，out当作buffer来定义

 

 

4 Error: Node instance "clk_gen1" instantiates undefined entity "clk_gen"

 

-------引用的例化元件未定义实体－－entity "clk_gen"

 

 

5 Warning: Found 2 node(s) in clock paths which may be acting as ripple and/or gated clocks -- node(s)  

 

analyzed as buffer(s) resulting in clock skew

 

Info: Detected ripple clock "clk_gen:clk_gen1|clk_incr" as buffer

 

Info: Detected ripple clock "clk_gen:clk_gen1|clk_scan" as buffer

 

6 Warning: VHDL Process Statement warning at ledmux.vhd(15): signal or variable "dataout" may not be  

 

assigned a new in every possible path through the Process Statement. Signal or variable "dataout" holds  

 

its previous in every path with no new assignment, which may create a combinational loop in the current  

 

design.

 

7 Warning: VHDL Process Statement warning at divider_10.vhd(17): signal "cnt" is read inside the Process  

 

Statement but isn't in the Process Statement's sensivitity list

 

   -----缺少敏感信号

 

 

8 Warning: No clock transition on "counter_bcd7:counter_counter_clk|q_sig[3]" register

 

9 Warning: Reduced register "counter_bcd7:counter_counter_clk|q_sig[3]" with stuck clock port to stuck  

 

GND

 

10 Warning: Circuit may not operate. Detected 1 non-operational path(s) clocked by clock "class[1]" with  

 

clock skew larger than data delay. See Compilation Report for details.

 

11 Warning: Circuit may not operate. Detected 1 non-operational path(s) clocked by clock "sign" with  

 

clock skew larger than data delay. See Compilation Report for details.

 

12 Error: VHDL error at counter_clk.vhd(90): actual port "class" of mode "in" cannot be associated with  

 

formal port "class" of mode "out"

 

------两者不能连接起来

 

 

13 Warning: Ignored node in vector source file. Can't find corresponding node name "class_sig[2]" in  

 

design.

 

------没有编写testbench文件，或者没有编辑输入变量的值 testbench里是元件申明和映射

 

 

14 Error: VHDL Binding Indication error at freqdetect_top.vhd(19): port "class" in design entity does  

 

not have std_logic_vector type that is specified for the same generic in the associated component

 

---在相关的元件里没有当前文件所定义的类型

 

 

15 Error: VHDL error at tongbu.vhd(16): can't infer register for signal "gate" because signal does not  

 

hold its outside clock edge

 

16 Warning: Found clock high time violation at 1000.0 ns on register  

 

"|fcounter|lpm_counter:temp_rtl_0|dffs[4]"

 

17 Warning: Compiler packed, optimized or synthesized away node "temp[19]". Ignored vector source file  

 

node.

 

---"temp[19]"被优化掉了

 

 

18 Warning: Reduced register "gate~reg0" with stuck data_in port to stuck GND

 

19 Warning: Design contains 2 input pin(s) that do not drive logic

 

Warning: No output dependent on input pin "clk"

 

Warning: No output dependent on input pin "sign"

 

------输出信号与输入信号无关，

 

 

20 Warning: Found clock high time violation at 16625.0 ns on register "|impulcomp|gate1"

 

21 Error: VHDL error at impulcomp.vhd(19): can't implement clock enable condition specified using binary  

 

operator "or"

 

22 Error: VHDL Association List error at period_counter.vhd(38): actual parameter assigned to formal  

 

parameter "alarm", but formal parameter is not declared

 

-------连接表错误，形参"alarm"赋值给实参，形参没定义，可能是形参与实参的位置颠倒了，规定形参在实参之前。

 

 

23 Error: Ignored construct behavier at period_counter.vhd(15) because of previous errors

 

－－－－－－－－因为前一个错误而导致的错误

 

 

24 Error: VHDL error at period_counter.vhd(38): type of identifier "alarm" does not agree with its usage  

 

as std_logic type

 

－－－－－－－－"alarm"的定义类型与使用的类型不一致

 

 

25 Error: VHDL error at shift_reg.vhd(24): can't synthesize logic for statement with conditions that  

 

test for the edges of multiple clocks

 

-------同一进程中含有两个或多个if(edge)条件，（一个进程中之能有一个时钟沿）

 

 

26 Error: Can't resolve multiple constant drivers for net "datain_reg[22]" at shift_reg.vhd(19)

 

27 can't infer register for signal "num[0]" because signal does not hold its outside clock edge

 

28Error: Can't elaborate top-level user hierarchy

 

29 Error: Can't resolve multiple constant drivers for net "cs_in" at led_key.vhd(32)     ----------有两

 

 

个以上赋值语句，不能确定“cs_in”的值，

 

 

30 Warning: Ignored node in vector source file. Can't find corresponding node name "over" in design.

 

---------------在源文件中找不到对应的节点“over”。

 

 

31 Error: Can't access JTAG chain

 

     无法找到下载链

 

 

32 Info: Assuming node "clk" is an undefined clock

 

  

 

Quartus警告分析 Warning

 

1.Found clock-sensitive change during active clock edge at time  

 

<time> on register "<name>"  

 

原因：vector source file中时钟敏感信号（如：数据，允许端，清零，同步加

 

 

载等）在时钟的边缘同时变化。而时钟敏感信号是不能在时钟边沿变化的。其后

 

 

果为导致结果不正确。  

 

措施：编辑vector source file

 

 

2.Verilog HDL assignment warning at <location>: truncated  

 

with size <number> to match size of target (<number>

 

原因:在HDL设计中对目标的位数进行了设定,如:reg[4:0] a;而默认为32位,

 

 

将位数裁定到合适的大小  

 

措施:如果结果正确,无须加以修正,如果不想看到这个警告,可以改变设定的位数

 

 

3.All reachable assignments to data_out(10) assign '0', register  

 

removed by optimization  

 

原因:经过综合器优化后，输出端口已经不起作用了

 

 

4.Following 9 pins have nothing, GND, or VCC driving datain port --  

 

changes to this connectivity may change fitting results  

 

原因:第9脚，空或接地或接上了电源  

 

措施:有时候定义了输出端口，但输出端直接赋‘0’，便会被接地，赋‘1’接电源。

 

 

如果你的设计中这些端口就是这样用的，那便可以不理会这些warning

 

 

5.Found pins ing as undefined clocks and/or memory enables  

 

原因:是你作为时钟的PIN没有约束信息。可以对相应的PIN做一下设定就行了。

 

 

主要是指你的某些管脚在电路当中起到了时钟管脚的作用，比如flip-flop的clk

 

 

管脚，而此管脚没有时钟约束，因此QuartusII把“clk”作为未定义的时钟。  

 

措施:如果clk不是时钟，可以加“not clock”的约束；如果是，可以在clock  

 

setting当中加入；在某些对时钟要求不很高的情况下，可以忽略此警告或在这

 

 

里修改:Assignments>Timing analysis settings...>Individual  

 

clocks...>...

 

6.Timing characteristics of device EPM570T144C5 are preliminary  

 

原因:因为MAXII 是比較新的元件在 QuartusII 中的時序并不是正式版的,要

 

 

等 Service Pack  

 

措施:只影响 Quartus 的 Waveform

 

 

7.Warning: Clock latency analysis for PLL offsets is supported for the  

 

current device family, but is not enabled  

 

措施:将setting中的timing Requirements&Option-->More Timing  

 

Setting-->setting-->Enable Clock Latency中的on改成OFF

 

 

8.Found clock high time violation at 14.8 ns on register  

 

"|counter|lpm_counter:count1_rtl_0|dffs[11]"  

 

原因:违反了steup/hold时间，应该是后仿真，看看波形设置是否和时钟沿符

 

 

合steup/hold时间  

 

措施:在中间加个寄存器可能可以解决问题

 

 

9.warning: circuit may not operate.detected 46 non-operational  

 

paths clocked by clock clk44 with clock skew larger than data delay  

 

原因:时钟抖动大于数据延时,当时钟很快，而if等类的层次过多就会出现这种问

 

 

题,但这个问题多是在器件的最高频率中才会出现  

 

措施：setting-->timing Requirements&Options-->Default required  

 

fmax 改小一些，如改到50MHZ

 

 

10.Design contains <number> input pin(s) that do not drive logic  

 

原因:输入引脚没有驱动逻辑(驱动其他引脚）,所有的输入引脚需要有输入逻辑  

 

措施:如果这种情况是故意的,无须理会,如果非故意,输入逻辑驱动.

 

 

11.Warning：Found clock high time violation at 8.9ns on node  

 

'TEST3.CLK'  

 

原因：FF中输入的PLS的保持时间过短  

 

措施：在FF中设置较高的时钟频率

 

 

12.Warning: Found 10 node(s) in clock paths which may be acting as  

 

ripple and/or gated clocks -- node(s) analyzed as buffer(s) resulting in  

 

clock skew  

 

原因:如果你用的 CPLD 只有一组全局时钟时，用全局时钟分频产生的另一个时

 

 

钟在布线中当作信号处理，不能保证低的时钟歪斜(SKEW)。会造成在这个时钟

 

 

上工作的时序电路不可靠，甚至每次布线产生的问题都不一样。  

 

措施:如果用有两组以上全局时钟的 FPGA 芯片，可以把第二个全局时钟作为另

 

 

一个时钟用，可以解决这个问题。

 

 

13.Critical Warning: Timing requirements were not met. See Report  

 

window for details.  

 

原因：时序要求未满足，  

 

措施：双击Compilation Report-->Time Analyzer-->红色部分（如clock  

 

setup:'clk'等）-->左键单击list path,查看fmax的SLACK REPORT再根据

 

 

提示解决,有可能是程序的算法问题

 

 

14.Can't achieve minimum setup and hold requirement <text> along  

 

<number> path(s). See Report window for details.  

 

原因：时序分析发现一定数量的路径违背了最小的建立和保持时间，与时钟歪斜

 

 

有关,一般是由于多时钟引起的  

 

措施：利用Compilation Report-->Time Analyzer-->红色部分（如clock  

 

hold:'clk'等），在slack中观察是hold time为负值还是setup time 为负值，

 

 

然后在：Assignment-->Assignment Editor-->To中增加时钟名(from  

 

node finder)，Assignment Name中增加  

 

和多时钟有关的Multicycle 和Multicycle Hold选项，如hold time为负，可

 

 

使Multicycle hold的值>multicycle,如设为2和1。

 

 

15: Can't analyze file -- file E://quartusii/*/*.v is missing  

 

原因：试图编译一个不存在的文件，该文件可能被改名或者删除了  

 

措施：不管他，没什么影响

 

 

16.Warning: Can't find signal in vector source file for input pin  

 

|whole|clk10m  

 

原因：因为你的波形仿真文件（ vector source file ）中并没有把所有的输入

 

 

信号(input pin)加进去，对于每一个输入都需要有激励源的

 

 

17.Error: Can't name logic scfifo0 of instance "inst" --  

 

has same name as current design file

 

原因：模块的名字和project的名字重名了  

 

措施：把两个名字之一改一下，一般改模块的名字

 

 

18.Warning: Using design file lpm_fifo0.v, which is not specified as a  

 

design file for the current project, but contains definitions for 1 design  

 

units and 1 entities in project Info: Found entity 1: lpm_fifo0  

 

原因：模块不是在本项目生成的，而是直接copy了别的项目的原理图和源程序

 

 

而生成的，而不是用QUARTUS将文件添加进本项目  

 

措施：无须理会，不影响使用

 

 

19.Timing characteristics of device <name> are preliminary  

 

原因：目前版本的QuartusII只对该器件提供初步的时序特征分析  

 

措施：如果坚持用目前的器件，无须理会该警告。关于进一步的时序特征分析会

 

 

在后续版本的Quartus得到完善。

 

 

20.Timing Analysis does not support the analysis of latches as  

 

synchronous elements for the currently selected device family  

 

原因：用analyze_latches_as_synchronous_elements setting可以让

 

 

Quaruts II来分析同步锁存，但目前的器件不支持这个特性  

 

措施：无须理会。时序分析可能将锁存器分析成回路。但并不一定分析正确。其

 

 

后果可能会导致显示提醒用户：改变设计来消除锁存器

 

 

21.Warning:Found xx output pins without output pin load capacitance  

 

assignment（网友：gucheng82提供）  

 

原因：没有给输出管教指定负载电容  

 

措施：该功能用于估算TCO和功耗，可以不理会，也可以在Assignment Editor

 

 

中为相应的输出管脚指定负载电容，以消除警告

 

 

22.Warning: Found 6 node(s) in clock paths which may be acting as  

 

ripple and/or gated clocks -- node(s) analyzed as buffer(s) resulting in  

 

clock skew

 

原因：使用了行波时钟或门控时钟，把触发器的输出当时钟用就会报行波时钟，

 

 

将组合逻辑的输出当时钟用就会报门控时钟  

 

措施：不要把触发器的输出当时钟，不要将组合逻辑的输出当时钟，如果本身如

 

 

此设计，则无须理会该警告

 

 

23.Warning (10268): Verilog HDL information at lcd7106.v(63):  

 

Always Construct contains both blocking and non-blocking  

 

assignments  

 

原因： 一个always模块中同时有阻塞和非阻塞的赋值

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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