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MultiMediaCard Product Manual
Table 4-3 Bus Timing
Parameter
Clock CLK (All values are referred to min. (VIH) and max. (VIL)
Clock Frequency Data Transfer Mode
( P P )
Clock Frequency Identification Mode
( O D )
Clock Low Time
Clock High Time
Clock Rise Time
Clock Fall Time
Clock Low Time
Clock High Time
Clock Rise Time
Clock Fall Time
Inputs CMD, DAT (referenced to CLK)
Input set-up time
Input hold time
Outputs CMD, DAT (referenced to CLK)
Output set-up time
Output hold time
4.5
MultiMediaCard Registers
There is a set of six registers within the card interface. The OCR, CID and CSD registers carry the card
configuration information. The RCA register holds the card relative communication address for t h e
current session. The DSR register is not implemented in the SanDisk MultiMediaCard.
4.5.1
Operating Conditions Register (OCR)
The 32-bit operation conditions register stores the V
MultiMediaCard is capable of executing the voltage recognition procedure (CMD1) with any standard
MultiMediaCard 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 4-4.
26
Symbol
M i n .
f
0
PP
f
0
O D
t
10
W L
t
10
W H
t
TLH
t
THL
t
50
W L
t
50
W H
t
TLH
t
THL
t
3
ISU
t
3
IH
t
5
OSU
t
5
O H
DD
SanDisk MultiMediaCard Product Manual Rev. 2 © 2000 SANDISK CORPORATION
M a x .
Unit
20
MHz
C
L
(10 cards)
400
kHz
C
L
(30 cards)
ns
C
L
(10 cards)
ns
C
L
(10 cards)
10
ns
C
L
(10 cards)
10
ns
C
L
(10 cards)
ns
C
L
(30 cards)
ns
C
L
(30 cards)
50
ns
C
L
(30 cards)
50
ns
C
L
(30 cards)
ns
ns
ns
ns
voltage profile of the
Remark
100 pF
250 pF
100 pF
100 pF
100 pF
100 pF
250 pF
250 pF
250 pF
250 pF
card. The
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