Hello experts,
on our custom board with C6748 we have 16bit 512MB Micron nand flash on EMIFA. We have problem with speed of memory, reading is slower than we expected. In attached picture is detail of reading 512B (256 words) from flash. Yellow signal is flash memory chip select (EMA_CSn_3) and pink one is read enable (EMA_OEn) signal. We have external 24MHz crystal, core clock is set to 300Mhz and EMIFA clock is set to 150MHz in GEL file ( device_PLL0(0,24,1,0,1,1,5); ). Memory wait signal is not toggled during memory read.
In this post
http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/55895.aspx
they have period of read signal shorter than 50ns with 100MHz EMIFA clock, while we have 600ns period with 150Mhz EMIFA clock.
Any suggestions why the read signal is so slow?
Thanks.
Jan