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(fù)聲明輸出端口信號(hào)

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(shí)，在打開(kāi)綜合設(shè)計(jì)或?qū)崿F(xiàn)設(shè)計(jì)時(shí)，或者在綜合或?qū)崿F(xiàn)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(shí)鐘約束已存在于 IP XDC 中，則無(wú)需在頂級(jí) xdc 中寫(xiě)入約束。

clk_wiz_0.xdc文件中如下已經(jīng)約束InClk；

當(dāng)設(shè)計(jì)中有多個(gè)作用域單元/引用的實(shí)例時(shí)會(huì)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(gè)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(xiàng)。

如果未使用 -name 選項(xiàng)，系統(tǒng)會(huì)根據(jù)網(wǎng)絡(luò)名/位置創(chuàng)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(shè)置保存Project文件權(quán)限，設(shè)置為讀寫(xiě)模式

5、 [Constraints 18-5210] No constraint will be written out.

解決方案：Vivado 中的一個(gè)已知錯(cuò)誤，將在 2020.1 中修復(fù)（可以忽略）

6、[Common 17-1548] Command failed: can't read "output_ports": no such variable

描述：set_input_delay時(shí)，端口命名錯(cuò)誤

解決方案：set_input_delay端口命名時(shí)，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(wèn)題在了 {} 里面的 “0” 了，原來(lái)在拼接符中的0，如果不指定其位數(shù)，則軟件會(huì)將其默認(rèn)為32bit，如果這個(gè)0不在高位，那么在進(jìn)行賦值的時(shí)候就會(huì)形成了將一個(gè)很多位的數(shù)據(jù)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(wú)法創(chuàng)建“SLEW”約束，因?yàn)閱卧癘BUFDS_inst”未直接連接到頂級(jí)端口。Vivado 會(huì)忽略“SLEW”，但會(huì)保留在數(shù)據(jù)庫(kù)中。

注意：INBUFDS與OBUFDS這類源語(yǔ)言是必須要有硬件連接的In或Out接口！

審核編輯：湯梓紅