EBI and Parallel NOR Flash driver on
In one of our projects we have interfaced an external parralel flash chip "st39vf020" with our micro efm32gg995f1024. We are using the EBI bus for communicating with the parralel flash. we are using EBI_AD00 to EBI_AD15 lines in multiplexed 8 bit data 24 bit address mode. Actually our flash is 2 Megabit(256kbyte) (8 bit data width, 18 address lines).
I have ran the norflash demo example on dk3750 kit and observed that when we complete the EBI_INIT() function then the external memory is mapped into the micro's memory space and we can observe the data in the specific memory bank address like chip manufacturer and identification.
I have tried to keep simlar settings as described below but when the EBI_Init function is called i only observe 0xFF at the starting memory location bank0(0x80000000). The chip manufacurer and and device identification data does not appear at the corresponding starting memory locations.
Am I missing some settings in the ebi intialization, we are using 4 ebi control signal namely: CE, OE/RE, WE and ALE. Any guidance in this regard would be greatly appreciated.
Thanks & Regards,
Oct 28 2017, 12:59 PM