--- /dev/null
+\r
+Subfolder content:\r
+1. source contains the demo source files \r
+2. impl contains the iCEcube project\r
+3. constraint contains constraint file\r
+\r
+How to regenerate bit file:\r
+1. lauch iCEcube\r
+2. open project impl_sbt.project under \impl\r
+3. run through the flow to generate bit file\r
+4. the generated bit files are under \impl\impl_Implmnt\sbt\outputs\bitmap
\ No newline at end of file