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发表于 2009-12-12 05:56:04
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以下是引用pman_cnsh在2009-12-12 0:51:13的发言:
利用地址线的确是一个办法,我没有验证过,但是从读写时序上CS早于地址线有效,晚于地址线无效,使用地址线可能存在时序问题,特别是burst工作模式下?
1.It is impossible that CS is longer than address bus active. Because it is encoded by address. Anyway, you do not need to worry about it. but you need to setup the CS to R/W timing correctly.
2.Most peripherals can not work in burst mode, otherwise it will have some unpredictable problems, including LCD, CP etc.Burst mode is working with FLASH and RAM in most case . |
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