Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Primetime transition related questions

Status
Not open for further replies.

krystalx

Newbie level 2
Joined
Jul 1, 2016
Messages
2
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
24
Hi guys, I'm new to Primetime and also not very familiar with some basic MOS technology.
I'm now trying to figure out one circuit, too see if it might have IR drop problems or something.
The circuit schematic is as followed **broken link removed**
We got 7 DFFs in a row, and each stage got its Q port connected to CK of next stage.
Right here Im trying to see if the transition time will be too large to cause IR drop or Tsetup/Thold violation
so first create_clock, set_clock_transition, and then figured out I have to set generated clocks to make CLK input of next stage works.

Clock Period Waveform Attrs Sources
-------------------------------------------------------------------------------
CLK 20.00 {0 10} p {CLK}
CLK2 40.00 {0 20} p, G {dff_basic1/Q}
CLK3 80.00 {0 40} p, G {dff_basic2/Q}
CLK4 160.00 {0 80} p, G {dff_basic3/Q}
CLK5 320.00 {0 160} p, G {dff_basic4/Q}
CLK6 640.00 {0 320} p, G {dff_basic5/Q}
CLK7 1280.00 {0 640} p, G {dff_basic6/Q}

Generated Master Generated Master Waveform
Clock Source Source Clock Modification
-------------------------------------------------------------------------------
CLK2 CLK dff_basic1/Q CLK div(2)
CLK3 dff_basic1/Q dff_basic2/Q CLK2 div(2)
CLK4 dff_basic2/Q dff_basic3/Q CLK3 div(2)
CLK5 dff_basic3/Q dff_basic4/Q CLK4 div(2)
CLK6 dff_basic4/Q dff_basic5/Q CLK5 div(2)
CLK7 dff_basic5/Q dff_basic6/Q CLK6 div(2)

idk if I set these clocks correctly, cuz I dont see transition time getting longer in each stage, and the report shows the slack in each stage are the same, which means the transition time of the input clock didnt change through each stage.

Is it because I set the generated clock wrong? or the transition time not correct?
 

Unfortunately your attachment expired unexpectedly. The reason is not known although it may be due to an extremely large image. Consider reducing its size, and post it as a followup reply. Then a moderator can merge it with your initial post.
 

QQ图片20160701114414.png
This is the image I intended to post
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top