Dear Sir, Thanks for your inputs. I will try this mode of reading. I was sending even instruction and address in 4 lines as mentioned for Quad command fast read. Thanks.
Dear rcinggham, One friend provided me the data sheet of N25Q128 and some code, he also could not read the flash. The code is for Quad command fast read and the simulation results are as mentioned in data sheet. But manufacturer of the board didn't mention in which mode the flash is configured.
