【SD】Task

Posted on 2008-08-13 10:47  猫咪与非  阅读(216)  评论(0)    收藏  举报

1. Draw pics & state machine: 

     CMD6 ACMD13 ACMD51 

     CMD7(Select/Diselect Card)

     CMD24: 56 sector - long delay- 56 sector- long delay

2. Timings (07.Ver1.01.pdf  p55~p60, p77)

     fOD: 310KHZ

     SD signal timing and waveform

           ACMD41 Repeat Length: 62.08ms

           Block read time(8.65us)

           Block write time(53.24us)

           Busy time during write(1.76ms)

           Wait time from read command to data output(295.8us)

           SD power on (1) Ready time(till ACMD41); (2) RSP time - 572.45us

3. Classify SD code by functions 

     Write Protect (28,29,30)

     Lock/Unlock(42)

4. Write assembling code of ROM download