vhdl常见问题分析

更新时间:2023-06-15 00:40:38 阅读: 评论:0

1 Warning: VHDL Process Statement warning at random.vhd(18): signal ret is in statement, but is not in nsitivity list----没把singal放到process()中" b# h/ I8 q2 ^0 l$ {6 @7 G1 u" m  _  s! s9 h
2 Warning: Found pins ing as undefined clocks and/or memory enables2 V/ ~0 f: [; j) ~5 G: ]9 }% P8 g3 T' ^& a# a, z
Info: Assuming node CLK is an undefined clock) _( x' U! f' C! j-----可能是说设计中产生的触发器没有使能端  g3 K% j: r3 J/ V# u+ k; C5 Q
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! ]) ?' E6 b5 o0 m+ M- L' e; l+ y9 W& h1 x; Y' g9 s
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"
% ]0 M2 y  A$ k% j5 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 skew6 M/ d1 {3 Y$ i$ H6 n% e7 n
lewitt8 p) r# H5 C: Q; \3 mInfo: Detected ripple clock "clk_gen:clk_gen1|clk_incr" as buffer# l4 y7 c' }9 c$ s7
V3 O1 Z5 E3 ]5 f" N( @. S5 K
Info: Detected ripple clock "clk_gen:clk_gen1|clk_scan" as buffer4 Q2 j" |9 _0 {  F9 s1 o/ N! Z
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.2 s1 O9 B" o6 c  K& |  z0 L/ X
汽车打蜡方法3 j; \7 C! J) V7 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 nsivitity list8 {5 `6 @+ T5 s
; V3 ~8 @/ o% w# d  -----缺少敏感信号" `! E: Q- \9 b" l" Q3 q) {/ x: h( S
8 Warning: No clock transition on "counter_bcd7:counter_counter_clk|q_sig[3]" register
8 s# y/ }5 h- }  g9  Warning: Reduced register "counter_bcd7:counter_counter_clk|q_sig[3]" with stuck clock port to stuck GND/ Y1 }/ a, P+ H3 C5 b  Q4 h/ @/ P2 dbinggou
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.2 c0 g1 F$ V2 Y& a! S) |4 M- p: `) U* F% p( I5 v( C1 ], V8 D2 J7 {
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.* @7 V+ w) V7 T. G4 J! e
doolan12 Error: VHDL error at counter_clk.vhd(90): actual port "class" of mode "in" cannot be associated with formal port "class" of mode "out"3 K& l0 p/ V( X: e, g5 m5 l& a------两者不能连接起来
2 f0 ?+ C8 F' t/ P5 N2 M9 ]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; h2 m. T3 l; S! ?* [
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
爱屋及乌英文. E8 e7 M! O/ ~: K( R* D2 w15 Error: VHDL error at tongbu.vhd(16): can't infer register for signal "gate" becau signal does not hold its outside clock edge4 N. M9 S  T+ r. M0 s0 K
网考报名. a5 n5 E) l& K/ v0 L16 Warning: Found clock high time violation at 1000.0 ns on register "|fcounter|lpm_counter:temp_rtl_0|dffs[4]", Z' n2 E6 B) V1 X/ ?) r! d1 o7 Z4 ]. K
17 Warning: Compiler packed, optimized or synthesized away node "temp[19]". Ignored vector source file node.---"temp[19]"被优化掉了/ r+ B2 K4 J6 |, X4 ^7 ^/ w. E% g* c5 {( k- j2 P7 L
18 Warning: Reduced register "gate~reg0" with stuck data_in port to stuck GND0 B# ]! l: u! B% ]/ j! D& }, Z! `& P9 m: C, i& M4 d
19 Warning: Design contains 2 input pin(s) that do not drive logic2 o' E4 K# h- I! i+ f6 }# q
! P7 x; N" s/ O  ?' m3 OWarning: No output dependent on input pin "clk"% F, o: |  m/ N2 @( v
1 c- h+ z! ~6 rWarning: No output dependent on input pin "sign" ------输出信号与输入信号无关,+ P9 [. ~  ?+ t
20 Warning: Found clock high time violation at 16625.0 ns on register "|impulcomp|gate1"  I6 X2 t! t" V) a0 E$ W; o( a6 \7 G2 ?大学生四六级报名官网
21 Error: VHDL error at impulcomp.vhd(19): can't implement clock enable condition specified using binary operator "or"
3 d  N! D0 ?7 ?* O; R3 w  h5 S3 @  C3 Y22Error: VHDL Association List error at period_counter.vhd(38): actual parameter assigned to formal parameter "alarm", but formal parameter is not declared" a; U% J3 r" \! U2 A0 I( |; d! i
alien
-------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。2 K) W) r# h5 c" V: _, Y6 A5 ?% ]& Z( I3 @- x7 X/ Q7 s
23 Error: Ignored construct behavier at period_counter.vhd(15) becau of previous errors# m$ O$ W' i2 J) Q
( T" q, G  [$ t: E8 @" \/ E--------因为前一个错误而导致的错误李阳疯狂英语官方网
1 v6 K0 M( ?& ]" A24 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' i' M: `" M3 N% n1 H+ M
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)( _" M9 A; ^' c# m" X
2 E. o4 x9 j( ~4 a! M# B4 Q26 Error: Can't resolve multiple constant drivers for net "datain_reg[22]" at shift_reg.vhd(19)
1 Q' I2 y; S# B0 i: ^3 I/ m27  can't infer register for signal "num[0]" becau signal does not hold its outside clock edge' k! Z# K, Q'
c& p7 ?
卫冕冠军的意思- W' P/ L8 [/ n5 m. i28Error: Can't elaborate top-level ur hierarchy0 ^! F( o5 v: F2 ~1 {) K! {
4 U# d% P+ c3 f1 M1 T- q8 v$ a29 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,/ L: I. o+ K2 c( L/ b
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”。1 {1 v/ A# j  j6 m; H2 Q) m8 ^; S% C& b$ t* W, W5 n
31 Error: Can't access JTAG chain, I& u' h) m& A- ]7 k; q8 S5 y; r9 V* {2 U' q
无法找到下载链  Info: Assuming node "clk" is an undefined clock
! }, a/ a! ?! g(转载). K9 n3 d1 L- R1 g3 X* |* s3 Z1 e

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