Datasheet

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datasheet SD Card
Rev. 1.0
MMBTFxxGWBCA-xMExx
4.3 SD Mode Card Registers
Six registers are defined within the card interface: OCR, CID, CSD, RCA, DSR and SCR. These can be accessed only by corresponding commands. The
OCR, CID, CSD and SCR registers carry the card/content specific information, while the RCA and DSR registers are configuration registers storing actual
configuration parameters.
4.3.1 OCR Register
• The 32-bit operation conditions register stores the VDD voltage profile of the card. Additionally, this register includes status information bits.
•See Section 5.1 of the SDA Physical Layer Specification, Version 3.00 for more information.
[Table 4-4] : OCR Register Definition
NOTE:
1) This bit is valid only when the card power up status bit is set.
2) This bit is set to LOW if the card has not finished the power up routine.
3) Only UHS-I card supports this bit.
OCR bit VDD Voltage Window OCR Value
0-3 reserved 0
4 reserved 0
5 reserved 0
6 reserved 0
7 reserved for Low Voltage Range 0
8 reserved 0
9 reserved 0
10 reserved 0
11 reserved 0
12 reserved 0
13 reserved 0
14 reserved 0
15 2.7 - 2.8 1
16 2.8 - 2.9 1
17 2.9 - 3.0 1
18 3.0 - 3.1 1
19 3.1 - 3.2 1
20 3.2 - 3.3 1
21 3.3 - 3.4 1
22 3.4 - 3.5 1
23 3.5 - 3.6 1
24
3
Switching to 1.8V Accepted (S18A) 0
24 - 29 reserved 0
30
Card Capacity Staus(CCS)
1
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31
Card power up status bit(busy)
2
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