Stats

Locked Locked
Replies 3
Subscribers 62
Views 15832
Members are here 0

This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Slow Clock Problem

Hello everybody

I'm designing a fully synchronous digital block for a biomedical application. Since I have a very slow dynamics in my design, I need a slow clock. So I expect to obtain a small power in the synthesis report (I assume if I decrease the speed of the clock the total power should be decreased). However, when I decrease the input clock (by assigning a large number for -period of my external clock) this error appears on screen:

Unsupported SDC command option. [SDC-201] [create_clock]

The 'create_clock' command on line '7' in the SDC file 'calcium.sdc' only accepts values less than 214748.364 for the '-period' option.

Could not interpret SDC command. [SDC-202] [read_sdc]

: The 'read_sdc' command encountered an error while processing this command on line '7' of the SDC file 'calcium.sdc': create_clock -name clk -period 125000000 [get_ports 'clk'].

The error stems from the large number that I have dedicated to -period in SDC file. I dont know how to define a slow clock for my design and check the coressponding power and area!

Kind regards,

HS88.

Could not interpret SDC command. [SDC-202] [read_sdc] : The 'read_sdc' command encountered an error while processing this command on line '7' of the SDC file 'calcium.sdc': create_clock -name clk -period 125000000 [get_ports '

Parents

grasshopper over 9 years ago

Hi Hamid,

if no activity file is provided or you are not explicitly setting the corresponding attributes, the SDC is used to determine the toggle of the clock signals which sounds like what you are seeing

gh-
Cancel
Vote Up 0 Vote Down

Cancel

Reply

grasshopper over 9 years ago

Hi Hamid,

if no activity file is provided or you are not explicitly setting the corresponding attributes, the SDC is used to determine the toggle of the clock signals which sounds like what you are seeing

gh-
Cancel
Vote Up 0 Vote Down

Cancel

Children

No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.