原创 Quartus警告分析！

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

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