目錄
1、[Synth 8-2611] redeclaration of ansi port XXX is not allowed
2、[Constraints 18-619] A clock with name 'InClk' already exists
3、 [Synth 8-2611] redeclaration of ansi port InClk is not allowed
4、 [Vivado 12-1017] Problems encountered:
5、 [Constraints 18-5210] No constraint will be written out.
6、[Common 17-1548] Command failed: can't read "output_ports": no such variable
7、[filemgmt 20-2001] Source scanning failed (terminated by user) while processing fileset "sources_1" due to unrecoverable syntax error or design hierarchy issues. Recovering last known analysis of the source files.
8、[Synth 8-1849] concatenation with unsized literal; will interpret as 32 bits
9、[Constraints 18-549] Could not create 'SLEW' constraint because cell 'OBUFDS_inst' is not directly connected to top level port. 'SLEW' is ignored by Vivado but preserved inside the database.
1、[Synth 8-2611] redeclaration of ansi port XXX is not allowed
程序中重復聲明輸出端口信號
2、[Constraints 18-619] A clock with name 'InClk' already exists
描述：
在約束文件XDC（SCOPED_TO_REF、SCOPED_TO_CELLS）中使用“create_clock -name”約束時，在打開綜合設計或實現設計時，或者在綜合或實現期間，可以觀察到以下警告。
[Constraints 18-619] A clock with name 'InClk' already exists overwriting the previous clock with the same name. ["E:/Vivado_Project/DispTimGen/DispTimGen.srcs/constrs_1/new/DispTimGenTiming.xdc":1]
解決方案：
如果時鐘約束已存在于 IP XDC 中，則無需在頂級 xdc 中寫入約束。
clk_wiz_0.xdc文件中如下已經約束InClk；
當設計中有多個作用域單元/引用的實例時會顯示此警告，因此多次讀取相同的“create_clock -name”約束。
如警告消息中所示，僅最后一個讀取保留，所有其他讀取都丟失。
推薦的解決方案是從 create_clock 命令中刪除 -name 選項。
如果未使用 -name 選項，系統會根據網絡名/位置創建唯一名稱。
3、 [Synth 8-2611] redeclaration of ansi port InClk is not allowed
輸入端口不需要申明wire型
4、 [Vivado 12-1017] Problems encountered:
[Vivado 12-1017] Problems encountered: Failed to delete one or more files in run directory E:/Vivado_Project/DispTimGen/DispTimGen.runs/synth_1
描述：保存Project文件夾為可讀模式
解決方案：設置保存Project文件權限，設置為讀寫模式
5、 [Constraints 18-5210] No constraint will be written out.
解決方案：Vivado 中的一個已知錯誤，將在 2020.1 中修復（可以忽略）
6、[Common 17-1548] Command failed: can't read "output_ports": no such variable
描述：set_input_delay時，端口命名錯誤
解決方案：set_input_delay端口命名時，將< >去掉
7、[filemgmt 20-2001] Source scanning failed (terminated by user) while processing fileset "sources_1" due to unrecoverable syntax error or design hierarchy issues. Recovering last known analysis of the source files.
重啟軟件可解決
8、[Synth 8-1849] concatenation with unsized literal; will interpret as 32 bits
問題在了 {} 里面的 “0” 了，原來在拼接符中的0，如果不指定其位數，則軟件會將其默認為32bit，如果這個0不在高位，那么在進行賦值的時候就會形成了將一個很多位的數據賦值給了2bit的BramRst。
9、[Constraints 18-549] Could not create 'SLEW' constraint because cell 'OBUFDS_inst' is not directly connected to top level port. 'SLEW' is ignored by Vivado but preserved inside the database.
約束 [18-549] 無法創建“SLEW”約束，因為單元“OBUFDS_inst”未直接連接到頂級端口。Vivado 會忽略“SLEW”，但會保留在數據庫中。
注意：INBUFDS與OBUFDS這類源語言是必須要有硬件連接的In或Out接口！
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