在线咨询
eetop公众号 创芯大讲堂 创芯人才网
切换到宽版

EETOP 创芯网论坛 (原名:电子顶级开发网)

手机号码,快捷登录

手机号码,快捷登录

找回密码

  登录   注册  

快捷导航
搜帖子
查看: 4134|回复: 3

[求助] 关于ptpx报的averaged和time_based的结果

[复制链接]
发表于 2014-7-21 19:13:49 | 显示全部楼层 |阅读模式

马上注册,结交更多好友,享用更多功能,让你轻松玩转社区。

您需要 登录 才可以下载或查看,没有账号?注册

x

averaged

averaged
     

time_based

time_based

上面两幅图为我用PTPX仿得功耗结果,分别为averaged和time_based的结果,请问time_based的上半部分报的是平均功耗么?如果是为什么和averaged的结果不一样,如果不一样,那是什么??谢谢!!!!!
发表于 2014-7-22 18:13:32 | 显示全部楼层
本帖最后由 lvguang 于 2014-7-22 21:26 编辑

I want to know which swithing activity  files do you use, the VCD or SAIF? I think it should be VCD otherwise you couldn't get the time_based power. You should know that, SAIF is only used to calculate the average power consumption while the VCD file contains detailed signal transition information which can be used to do both the average and time-based power analysis. VCD file is a superset of SAIF file.

Assume you used the VCD file. When calculating the averaged power, only the toggle rates and time information like how  much time a signal keeps high, low, or "x" are used. When calculating the time-based power, the detailed information of the switching activities are recorded. The time-based analysis will also report the average power. Because the avaraged power analysis and time-based analysis use different models to calcluate to power, the reported power consumption usually differs.

For example, the averaged power analysis (PTPX) will only use SP1, which represents the percentage of a signal at "1" during the whole simulation time. If SP1=70%, it means this signal is high in 70% of the simlation time.  The toggle rate of some unannoated nets or cells will be derived using some specific rules. For time-based power analysis, more complicated information is used. It also calcluate the power of some specific states, like "X", "Z", using some models.

Totally speaking, they use different models to calcluate the averaged power. I don't know the accurate algorithms. But this is very normal and you don't need to be worried about this issue. If you want to know the reason, you should read the mannul.
发表于 2018-10-15 16:09:15 | 显示全部楼层
回复 2# lvguang


   make
发表于 2020-8-11 12:34:31 来自手机 | 显示全部楼层
Make        
您需要登录后才可以回帖 登录 | 注册

本版积分规则

关闭

站长推荐 上一条 /1 下一条

×

小黑屋| 关于我们| 联系我们| 在线咨询| 隐私声明| EETOP 创芯网
( 京ICP备:10050787号 京公网安备:11010502037710 )

GMT+8, 2024-3-29 18:10 , Processed in 0.022829 second(s), 9 queries , Gzip On, Redis On.

eetop公众号 创芯大讲堂 创芯人才网
快速回复 返回顶部 返回列表