XST Settings

We’ve recently identified an issue that effects all Spartan 6 designs. The XST option “-read_cores” is enabled by default and if the Opal Kelly cores (*.ngc) are placed in the root of an ISE project’s directory or pointed to using the -sd option in XST then optimizations are made that effect timing of okHost IO. The current solution is to disable the XST “-read_core” option. An update to okLibrary is in progress.