高容量SD card CSD寄存器与低容量CSD寄存器有什么区别呢？

过云雨

高容量SD card CSD寄存器与低容量CSD寄存器有什么区别呢？ [复制链接]

CSD register of High capability SD card

难道仅仅只有返回的Device size（C_Size）是block数目还是byte数目有区别吗？

哪位有表格对比或者寄存器图示之类的请分享一下，十分感谢。

jgj

memory capacity = BLOCKNR * BLOCK_LEN
Where:
BLOCKNR = (C_SIZE+1) * MULT
MULT = 2C_SIZE_MULT+2 (C_SIZE_MULT < 8)
BLOCK_LEN = 2READ_BL_LEN (READ_BL_LEN < 12)

Therefore, the maximum capacity which can be coded is 4096*512*2048 = 4 GBytes. Example: A four MByte card
with BLOCK_LEN = 512 can be coded with C_SIZE_MULT = 0 and C_SIZE = 2047.


C_SIZE_MULT  [49:47]
C_SIZE       [73:62]
READ_BL_LEN  [83:80]

KENLAA

下个手册自己看吧，SD Specifications Part 1 Physical Layer Simplified Specification Version 2.00