Quartus

SDRAM clock frequency may be too slow for SDRAM initialization to be completed within one SDRAM refresh period


CAUSE: You attempted to generate a flash programming file or one or more passive programming files. As part of this process, you specified in the System Build Descriptor File (.sbd) for the current project the SDRAM clock frequency and SDRAM refresh period for SDRAM initialization. However, the SDRAM clock frequency you specified may be too slow for the completion of SDRAM initialization, which must occur within one SDRAM refresh period. You either specified an SDRAM clock frequency that is too slow, or you specified an SDRAM refresh period that is too short.
ACTION: To avoid problems during SDRAM initialization, specify a longer SDRAM clock frequency or SDRAM refresh period so the SDRAM initialization can be completed within one SDRAM refresh period.

See also:

Alternative Procedure for Generating a Flash Programming File
Alternative Procedure for Generating Passive Programming Files
Generating a Flash Programming File
Generating Optional Programming Files for Programmer Object Files
Generating Optional Programming Files for SRAM Object Files
Generating Passive Programming Files
Overview: Using the MegaWizard Plug-In Manager

- PLDWorld -

 

Created by chm2web html help conversion utility.