Card Identification (Cid) Register - SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Product Manual

SD Card Interface Description
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.
00

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
SD Card has a different structure than the CID register in the MultiMediaCard.
3-12
OCR Bit
17
18
19
20
21
22
23
24-30
31
24 16
6
FF 80
Figure 3-8. OCR Structure
SanDisk Secure Digital (SD) Card Product Manual, Rev. 1.9 © 2003 SANDISK CORPORATION
VDD Voltage Window
2.9-3.0
3.0-3.1
3.1-3.2
3.2-3.3
3.3-3.4
3.4-3.5
3.5-3.6
reserved
Card power up status bit (busy)
8 7 4 3
0
0 0
Reserve
Operatin
Voltage
2.7 – 3.6
Reserve
Busy