Industrial Grade SD Card Interface Description
3-12 SanDisk Industrial Grade SD Product Manual, Rev. 1.0 © 2003 SANDISK CORPORATION
OCR Bit VDD Voltage Window
17 2.9-3.0
18 3.0-3.1
19 3.1-3.2
20 3.2-3.3
21 3.3-3.4
22 3.4-3.5
23 3.5-3.6
24-30 reserved
31 Card power up status bit (busy)
The level coding of the OCR register is as follows:
• Restricted voltage windows=LOW
• Card busy=LOW (bit 31)
The least significant 31 bits are constant and will be set as described in Figure 4-8. If bit 32 (the busy bit) is set, it
informs the host that the card power up procedure is finished.
Figure 3-8. OCR Structure
3.5.2. Card Identification (CID) Register
The CID register is 16 bytes long and contains a unique card identification number as shown in Table 3-9. It is
programmed during card manufacturing and cannot be changed by SD Card hosts. Note that the CID register in the
Industrial Grade SD Card has a different structure than the CID register in the MultiMediaCard.
00
24 0
80
8 7 4 3
FF
16
Reserve
Operatin
Voltage
2.7 – 3.6
Reserve
Busy
0 0
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