Product manual

Industrial Grade SD Card Interface Description
SanDisk Industrial Grade SD Product Manual, Rev. 1.0 © 2003 SANDISK CORPORATION -3-11
Parameter Symbol Min. Max. Unit Remark
Inputs CMD, DAT (referenced to CLK)
Input set-up time t
ISU
5 ns
C
L
≤ 25 pF
(1 cards)
Input hold time t
IH
5 ns
C
L
≤ 25 pF
(1 cards)
Outputs CMD, DAT (referenced to CLK)
Output delay time during Data Transfer Mode t
ODLY
0 14 ns
C
L
≤ 25 pF
(1 cards)
Output delay time during Identification Mode t
ODLY
0 50 ns
C
L
≤ 25 pF
(1 cards)
NOTE: OHz stops the clock. The given minimum frequency range is for cases where a continuous clock is required.
3.5. Industrial Grade SD Card Registers
There is a set of seven registers within the card interface. The OCR, CID, CSD and SCR registers carry the card
configuration information. The RCA register holds the card relative communication address for the current session.
The card status and SD status registers hold the communication protocol related status of the card.
3.5.1. Operating Conditions Register (OCR)
The 32-bit operation conditions register stores the V
DD
voltage profile of the card. The Industrial Grade SD Card is
capable of executing the voltage recognition procedure (CMD1) with any standard SD Card host using operating
voltages form 2 to 3.6 Volts.
Accessing the data in the memory array, however, requires 2.7 to 3.6 Volts. The OCR shows the voltage range in
which the card data can be accessed. The structure of the OCR register is described in Table 3-8.
Table 3-8. OCR Register Definition
OCR Bit VDD Voltage Window
0-3 Reserved
4 1.6-1.7
5 1.7-1.8
6 1.8-1.9
7 1.9-2.0
8 2.0-2.1
9 2.1-2.2
10 2.2-2.3
11 2.3-2.4
12 2.4-2.5
13 2.5-2.6
14 2.6-2.7
15 2.7-2.8
16 2.8-2.9