Avalon -> Dual Port RAM -> custom hardware interface

Hi All,

I am creating a custom memory mapped device and need to create an 8k byte block of dual port RAM with write-only access from NIOS, and read-only access from the custom hardware side.

RAM needs to be internal to the Cyclone IV FPGA.

I have found a dual-port Avalon memory part within SOPC builder, but feel that I don't need anything quite as elaborate as Avalon on the custom hardware side.

Having said that, the custom hardware will be reading a byte every 8th clock cycle at 50Mhz, so I will need the Avalon / NIOS side to generate wait states should a bus conflict occur.

Any pointers appreciated before I go-chasing-my-tail for a week.

Many thanks,

Mark