嗨,
我没有在任何路径上设置时序限制,我也不使用异步复位,但我不确定时钟域交叉.Below是后PAR的报告,它表示目标时钟CLK的设置时钟为15.828nsec .i
怀疑这必须是可达到的最大时钟频率(63.179MHz)。
请分享您的观点。
谢谢,
S.Bharath
--------------------------------------------------
------------------------------版本14.4 Trace(lin64)版权所有(c)1995-2012 Xilinx,Inc。保留所有权利
。
/opt/Xilinx/14.4/ISE_DS/ISE/bin/lin64/unwrapped/trce -intstyle ise -v 3 -s 5 -n 3 -fastpaths -xml SimpleCoGForm.twx SimpleCoGForm.ncd -o SimpleCoGForm.twr SimpleCoGForm.pcf设计文件
:SimpleCoGForm.ncd物理约束文件:SimpleCoGForm.pcf设备,包,速度:xc3s100e,cp132,-5(PRODUCTION 1.27 2012-12-04)报告级别:详细报告环境变量效果----------
---------- ------ NONE没有设置环境变量----------------------------
--------------------------------------------------
- 信息:时间:2698 - 没有发现时间限制,进行默认枚举。
信息:时序:3412 - 要改善时序,请参阅时序收敛用户指南(UG612)。
信息:时序:2752 - 要获得完整的路径覆盖,请使用无约束路径选项。
所有未受约束的路径都将在报告的无约束路径部分中报告。
信息:时序:3339 - 此时序报告中的时钟输出数字基于50欧姆传输线负载模型。
有关此型号的详细信息,以及有关计算不同负载条件的更多信息,请参见器件数据手册。
信息:时序:3390 - 此架构不支持默认的系统抖动值,请向UCF添加SYSTEM_JITTER约束以修改时钟不确定性计算。
信息:时序:3389 - 该架构不支持“离散抖动”和“相位误差”计算,这些术语在时钟不确定度计算中将为零。
请对SYSTEM_JITTER进行适当的修改,以解决不支持的离散抖动和相位误差。
数据表报告:-----------------所有值以纳秒为单位显示(ns)Clock CLK to Pad ------------ + ----
-------- + ------------------ + -------- + |
clk(边缘)|
|
时钟|
目的地|
到PAD |内部时钟|
阶段|
------------ + ------------ + ------------------ + -----
--- + Xc |
7.419(R)| CLK_BUFGP |
0.000 |
Xc |
7.442(R)| CLK_BUFGP |
0.000 |
Xc |
7.376(R)| CLK_BUFGP |
0.000 |
Xc |
7.122(R)| CLK_BUFGP |
0.000 |
Xc |
6.637(R)| CLK_BUFGP |
0.000 |
Xc |
6.882(R)| CLK_BUFGP |
0.000 |
Xc |
6.693(R)| CLK_BUFGP |
0.000 |
Xc |
6.912(R)| CLK_BUFGP |
0.000 |
Xc |
7.143(R)| CLK_BUFGP |
0.000 |
Xc |
7.336(R)| CLK_BUFGP |
0.000 |
Xc |
7.164(R)| CLK_BUFGP |
0.000 |
Xc |
6.882(R)| CLK_BUFGP |
0.000 |
Xc |
7.187(R)| CLK_BUFGP |
0.000 |
Xc |
7.089(R)| CLK_BUFGP |
0.000 |
Xc |
6.920(R)| CLK_BUFGP |
0.000 |
Xc |
7.087(R)| CLK_BUFGP |
0.000 |
Yc |
7.105(R)| CLK_BUFGP |
0.000 |
Yc |
6.845(R)| CLK_BUFGP |
0.000 |
Yc |
7.101(R)| CLK_BUFGP |
0.000 |
Yc |
7.328(R)| CLK_BUFGP |
0.000 |
Yc |
7.097(R)| CLK_BUFGP |
0.000 |
Yc |
7.078(R)| CLK_BUFGP |
0.000 |
Yc |
6.670(R)| CLK_BUFGP |
0.000 |
Yc |
7.086(R)| CLK_BUFGP |
0.000 |
Yc |
7.146(R)| CLK_BUFGP |
0.000 |
Yc |
6.614(R)| CLK_BUFGP |
0.000 |
Yc |
7.363(R)| CLK_BUFGP |
0.000 |
Yc |
7.085(R)| CLK_BUFGP |
0.000 |
Yc |
6.669(R)| CLK_BUFGP |
0.000 |
Yc |
7.097(R)| CLK_BUFGP |
0.000 |
Yc |
6.613(R)| CLK_BUFGP |
0.000 |
Yc |
7.096(R)| CLK_BUFGP |
0.000 |
------------ + ------------ + ------------------ + -----
--- +设置目标时钟CLK的时钟--------------- + --------- + --------- + ---
------ + --------- + |
源:崛起|
源:秋季|
源:崛起|
源:秋季|
源时钟|目的地:上升|目的地:上升|目的地:秋天|目的地:秋天|
--------------- + --------- + --------- + --------- + ----
----- + CLK |
15.828 |
|
|
|
--------------- + --------- + --------- + --------- + ----
----- +分析完成2013年6月17日星期一13:40:13 ---------------------------------
-----------------------------------------------跟踪设置:
-------------------------跟踪设置峰值内存使用量:339 MB
以上来自于谷歌翻译
以下为原文
Hi,
I have placed no timing constraints on any paths and i dont use asynchronous resets as well , but i am not sure about the clock domain crossings.Below is the report of post PAR it indicates Clock to Setup on destination clock CLK as 15.828nsec .i suspect this must be the maximum attainable Clock frequency(63.179MHz).
please share your views.
Thanks,
S.Bharath
--------------------------------------------------------------------------------
Release 14.4 Trace (lin64)
Copyright (c) 1995-2012 Xilinx, Inc. All rights reserved.
/opt/Xilinx/14.4/ISE_DS/ISE/bin/lin64/unwrapped/trce -intstyle ise -v 3 -s 5 -n
3 -fastpaths -xml SimpleCoGForm.twx SimpleCoGForm.ncd -o SimpleCoGForm.twr
SimpleCoGForm.pcf
Design file: SimpleCoGForm.ncd
Physical constraint file: SimpleCoGForm.pcf
Device,package,speed: xc3s100e,cp132,-5 (PRODUCTION 1.27 2012-12-04)
Report level: verbose report
Environment Variable Effect
-------------------- ------
NONE No environment variables were set
--------------------------------------------------------------------------------
INFO:Timing:2698 - No timing constraints found, doing default enumeration.
INFO:Timing:3412 - To improve timing, see the Timing Closure User Guide (UG612).
INFO:Timing:2752 - To get complete path coverage, use the unconstrained paths
option. All paths that are not constrained will be reported in the
unconstrained paths section(s) of the report.
INFO:Timing:3339 - The clock-to-out numbers in this timing report are based on
a 50 Ohm transmission line loading model. For the details of this model,
and for more information on accounting for different loading conditions,
please see the device datasheet.
INFO:Timing:3390 - This architecture does not support a default System Jitter
value, please add SYSTEM_JITTER constraint to the UCF to modify the Clock
Uncertainty calculation.
INFO:Timing:3389 - This architecture does not support 'Discrete Jitter' and
'Phase Error' calculations, these terms will be zero in the Clock
Uncertainty calculation. Please make appropriate modification to
SYSTEM_JITTER to account for the unsupported Discrete Jitter and Phase
Error.
Data Sheet report:
-----------------
All values displayed in nanoseconds (ns)
Clock CLK to Pad
------------+------------+------------------+--------+
| clk (edge) | | Clock |
Destination | to PAD |Internal Clock(s) | Phase |
------------+------------+------------------+--------+
Xc<0> | 7.419(R)|CLK_BUFGP | 0.000|
Xc<1> | 7.442(R)|CLK_BUFGP | 0.000|
Xc<2> | 7.376(R)|CLK_BUFGP | 0.000|
Xc<3> | 7.122(R)|CLK_BUFGP | 0.000|
Xc<4> | 6.637(R)|CLK_BUFGP | 0.000|
Xc<5> | 6.882(R)|CLK_BUFGP | 0.000|
Xc<6> | 6.693(R)|CLK_BUFGP | 0.000|
Xc<7> | 6.912(R)|CLK_BUFGP | 0.000|
Xc<8> | 7.143(R)|CLK_BUFGP | 0.000|
Xc<9> | 7.336(R)|CLK_BUFGP | 0.000|
Xc<10> | 7.164(R)|CLK_BUFGP | 0.000|
Xc<11> | 6.882(R)|CLK_BUFGP | 0.000|
Xc<12> | 7.187(R)|CLK_BUFGP | 0.000|
Xc<13> | 7.089(R)|CLK_BUFGP | 0.000|
Xc<14> | 6.920(R)|CLK_BUFGP | 0.000|
Xc<15> | 7.087(R)|CLK_BUFGP | 0.000|
Yc<0> | 7.105(R)|CLK_BUFGP | 0.000|
Yc<1> | 6.845(R)|CLK_BUFGP | 0.000|
Yc<2> | 7.101(R)|CLK_BUFGP | 0.000|
Yc<3> | 7.328(R)|CLK_BUFGP | 0.000|
Yc<4> | 7.097(R)|CLK_BUFGP | 0.000|
Yc<5> | 7.078(R)|CLK_BUFGP | 0.000|
Yc<6> | 6.670(R)|CLK_BUFGP | 0.000|
Yc<7> | 7.086(R)|CLK_BUFGP | 0.000|
Yc<8> | 7.146(R)|CLK_BUFGP | 0.000|
Yc<9> | 6.614(R)|CLK_BUFGP | 0.000|
Yc<10> | 7.363(R)|CLK_BUFGP | 0.000|
Yc<11> | 7.085(R)|CLK_BUFGP | 0.000|
Yc<12> | 6.669(R)|CLK_BUFGP | 0.000|
Yc<13> | 7.097(R)|CLK_BUFGP | 0.000|
Yc<14> | 6.613(R)|CLK_BUFGP | 0.000|
Yc<15> | 7.096(R)|CLK_BUFGP | 0.000|
------------+------------+------------------+--------+
Clock to Setup on destination clock CLK
---------------+---------+---------+---------+---------+
| Src:Rise| Src:Fall| Src:Rise| Src:Fall|
Source Clock |Dest:Rise|Dest:Rise|Dest:Fall|Dest:Fall|
---------------+---------+---------+---------+---------+
CLK | 15.828| | | |
---------------+---------+---------+---------+---------+
Analysis completed Mon Jun 17 13:40:13 2013
--------------------------------------------------------------------------------
Trace Settings:
-------------------------
Trace Settings
Peak Memory Usage: 339 MB