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在NIOSII中设置SDRAM时,第二个选项卡Timing中的各项根据A3V64S40ETP芯片因该怎么设置呀?
我只查到第一项CAS latency cycle 根据数据手册是可编程设置为2或3,其余几项为:
Initialization refresh cycle:
Issue one refresh command every:
Delay after powerup,before initialization:
Duration of refresh command(t_rtc):
Duration of precharge command(t_rcd):
Access time(t_ac):
Write recovery time(t_wr,no auto precharge):
这几项的数值怎么设定呀,请大家多多指教,多谢1 |
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