We are moving a project forward to quartos 14.1 (and new hardware).The qsys page for 'On-Chip memory' now lets you select single clock in order to get true dual port and OLD_DATA. However there is a comment that 'Tightly Coupled Memory operation requires dual port & dual clock sources. Lack of 'OLD_DATA' gave us grief on 9.1 and we fixed it by editing the memory wrapper. Does anyone know if this is still a bug/restriction in qsys, or is the comment wrong. IIRC the tightly coupled memory uses the 'address_stall' to hold the output data during pipeline stalls. This seems to be defined for the Cyclone V we are targetting.