write_sdc命令所生成的sdc文件是一个工业标准文件,可以被第三方的软件工具所识别。对于set_disable_clock_gating_check/remove_disable_clock_gating_check命令是S工具的命令,不属于sdc文件的范畴,因此在含有sdc文件所支持的命令之外的建议使用write_script命令,同样的write_script命令产生的非标准sdc文件只能用S公司的相...
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I then call write_sdc, reset my design, and read the 'written' sdc. The idea is to save a whole heck of a lot of time searching the netlist. Well, when I re-read the 'written' sdc, I get timing violations on DDR3 controller nets. Is there a bug in write_sdc? What is the...
I then call write_sdc, reset my design, and read the 'written' sdc. The idea is to save a whole heck of a lot of time searching the netlist. Well, when I re-read the 'written' sdc, I get timing violations on DDR3 controller nets. Is there a bug in write_sdc? What is the...
write _ sdcTypes, Data
skip: 输入文件开始读取的block数, block数从0开始计数 此外该命令还可以带一些转化参数, 详细可参考man dd. # read from SD dd if=/dev/sdc of=./envdata bs=512 count=32 skip=2012110 # write to SD dd if=./u-boot-movi.bin of=/dev/sdc bs=512 count=1072 seek=2011086...
int fsync(int fd); 程序调用本函数, 通知内核把数据写到硬盘(file)中. 比如, 你开发一个数据库软件, 就需要这样的函数, 否则掉电或者系统崩溃时便会丢失数据. 如果你的程序不调用 fsync(),Linux内核也会自动在”合适”的时候将你的数据真正写入到硬盘(类似调用 fsync), 最长的延时默认是 30 秒. ...
最近面试被问到了写时复制(cow)的概念,顺便在这里整理一下,简单说说写时复制的设计理念和使用场景,暂时不会太深入技术实现,技术部分的介绍有机会再去单开一章。 需求和目标 本质上写时复制是一个针对内存资源管理的技术,用以提高内存的使用效率和响应速度。当一个或多个程序单元使用另一个程序单元进行初始化时,...
解释错误消息 "mount: /dev/sdc is write-protected, mounting read-only" 的含义 该错误消息表明,当尝试挂载设备 /dev/sdc 时,系统检测到该设备处于写保护状态,因此只能以只读模式挂载。这通常意味着无法向该设备写入数据,但可以从该设备读取数据。 可能导致设备被写保护的原因 硬件写保护开关:某些存储设备(如SD...
Isnt this also used by BoomTile? In which case we need an additional .sdc file. Also, the BUILD bazel need to be updated to use the file. Isnt this also used by BoomTile? In which case we need an additional .sdc file. Also, the BUILD bazel need to be updated to use the file....