Key words: Spartan 3E, DCM, DLL,DFS, frequency, architecture wizard.
When using Architecture wizard to generate DCM for Spartan 3E stepping 0, a waring pops up as below if the input clock is outside of DLL out range.
The input clock frequency correctly fall with the Spartan3E stepping 1 valid range. However, the input clock frequency does not fall within the valid Spartan 3E stepping 0 range of 5-90. Please check the datasheet.
The warning is incorrect, please ignore it and refer to datasheet.
Input frequency range for steppine 0 & 1: 0.2-333MHz without DLL and 5-90MHz with DLL.