Specifications

©Copyright 2001-2013 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 4.10
113
5.2 CID register
The Card IDentification (CID) register is 128 bits wide. It contains the card identification information
used during the card identification phase. Every individual Read/Write (RW) card shall have a unique
identification number. The structure of the CID register is defined in the following paragraphs:
Name
Field
Width
CID-slice
Manufacturer ID
MID
8
[127:120]
OEM/Application ID
OID
16
[119:104]
Product name
PNM
40
[103:64]
Product revision
PRV
8
[63:56]
Product serial number
PSN
32
[55:24]
reserved
--
4
[23:20]
Manufacturing date
MDT
12
[19:8]
CRC7 checksum
CRC
7
[7:1]
not used, always 1
-
1
[0:0]
Table 5-2: The CID Fields
• MID
An 8-bit binary number that identifies the card manufacturer. The MID number is controlled, defined,
and allocated to a SD Memory Card manufacturer by the SD-3C, LLC. This procedure is established to
ensure uniqueness of the CID register.
• OID
A 2-character ASCII string that identifies the card OEM and/or the card contents (when used as a
distribution media either on ROM or FLASH cards). The OID number is controlled, defined, and allo-
cated to a SD Memory Card manufacturer by the SD-3C, LLC. This procedure is established to ensure
uniqueness of the CID register.
Note: SD-3C, LLC licenses companies that wish to manufacture and/or sell SD Memory Cards, including but not limited
to flash memory, ROM, OTP, RAM, and SDIO Combo Cards.
SD-3C, LLC is a limited liability company established by Panasonic Corporation, SanDisk Corporation and Toshiba
Corporation.
• PNM
The product name is a string, 5-character ASCII string.
• PRV
The product revision is composed of two Binary Coded Decimal (BCD) digits, four bits each, repre-
senting an "n.m" revision number. The "n" is the most significant nibble and "m" is the least significant
nibble.
As an example, the PRV binary value field for product revision "6.2" will be: 0110 0010b
• PSN
The Serial Number is 32 bits of binary number.