GL826 USB 2.0 Multi-Slot Flash Card Reader Controller
4.9 AC Characteristics of Secure Digital / MultiMediaCard
fPP
tWL
tWH
Clock
tTHL
tTLH
tISU
tIH
Input
tODLY
Output
Figure 4.6－Timing Diagram of Secure Digital / MultiMediaCard
Table 4.10－AC Characteristics of SD/MMC Interface Timing (CL = 10 pF)
Symbol
fPP
Parameter
Clock frequency Data Transfer Mode
Clock frequency Identification Mode
Clock low time (min)
Clock Rate
24
Unit
MHz
KHz
ns
48
375
7
20
375
22
22
3
15
375
30
30
3
fOD
375
20
20
3
tWL
tWH
Clock high time (min)
7
ns
tTLH
tTHL
tISU
Clock rise time (max)
3
ns
Clock fall time (max)
3
3
3
3
ns
Input set-up time (min)
6
5
20
20
14
27
27
14
ns
tIH
Input hold time (min)
2
5
ns
tODLY
Output delay time (max)
14
14
ns
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