My external memory (SRAM or flash) was working in 9.2i but after doing a revision update in 10.1, my SRAM or my flash is no longer working. What is the problem?
The new external memory controller core version number was improperly revised and as a result the 'revup' process recommended to upgrade to xps_mch_emc_v1_01_a from xps_mch_emc_v1_00_a. The new version of the core requires that a new port be connected. To fix the problem, add the following line in the MHS file in the xps_mch_emc instance:
PORT RdClk = sys_clk_s
Where sys_clk_s is the bus clock. The design will have to be reimplemented for the change to take affect.