64MB/128MB/256MB/512MB Secure Digital Card
5. Bus Timing
Parameter
Symbol
Min
Max
Unit
Remark
Clock CLK (All values are referred to min (VIH) and max (VIL)
Clock frequency Data Transfer Mode
Clock frequency Identification Mode (The low freq.
is required for MultiMediaCard compatibility.)
Clock low time
fpp
0
0
20
MHz
KHz
CL<100pF,(7 cards)
CL<250pF,(21 cards)
fOD
400
tWL
tWH
tTLH
tTHL
10
50
10
50
ns
ns
ns
ns
ns
ns
ns
ns
CL≤100pF, (7 cards)
CL≤250pF, (21 cards)
CL≤100pF, (7 cards)
CL≤250pF, (21 cards)
CL≤100pF, (7 cards)
CL≤250pF, (21 cards)
CL≤100pF, (7 cards)
CL≤250pF, (21 cards)
Clock high time
Clock rise time
Clock fall time
10
50
10
50
Inputs CMD, DAT (referenced to CLK)
Input set-up time
fISU
fIH
5
5
ns
ns
CL<25pF,(1 cards)
CL<25pF,(1 cards)
Input hold time
Outputs CMD, DAT (referenced to CLK)
Output Delay time
fODLY
0
14
ns
CL<25pF,(1 cards)
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