405MHz2440没用DMA读取Nandflash速度只有22K,正常吗
NandFlash是Spansion的S34ML02G,芯片手册上说PageRead/Program–Randomaccess:25s(Max)随机访问–Sequentialaccess:25ns(Min)串行访问,两种访问方式有什么区别–Programtime/MultiplaneProgramtime:200s(Typ)写入时间200usBlockErase(S34ML01G1)–BlockErase