Verifiy failed between adr.... in SRAM DE2-115 tPad Simple Socket Project

Had a similar problem with Terasic SRAM when it is connected to a NIOS II/f (NIOS II/e - no problem). This is because the II/f is much faster (can have transactions one after the other due to the pipeline that it has). I solved this by modifying the Terasic SRAM component in the SOPC system by adding having 2 read waitstates, 2 write waitstates, and 1 hold cycle and 1 setup cycle (this is probably an overkill, you could probably omit a few of the wait states or setup/hold cycles). Now it works without a problem with the II/f (NIOS CLK = 50 MHz). I recommend using the SDRAM for the NIOS, because it is faster and has more capacity than the Terasic SRAM. If you must use the SRAM, change the SOPC component as I indicated above.