MMC Interface
Definition of symbols
Table 199. MMC Interface Timing Symbol Definitions
Signals
Conditions
High
C
D
O
Clock
H
L
Data In
Data Out
Low
V
X
Valid
No Longer Valid
Timings
Table 200. MMC Interface AC timings
DD = 2.7 to 3.3 V, TA = -40 to +85°C, CL ≤ 100pF (10 cards)
V
Symbol
TCHCH
Parameter
Min
50
Max
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
Clock Period
TCHCX
TCLCX
TCLCH
TCHCL
TDVCH
TCHDX
TCHOX
TOVCH
Clock High Time
Clock Low Time
Clock Rise Time
Clock Fall Time
10
10
10
10
Input Data Valid to Clock High
Input Data Hold after Clock High
Output Data Hold after Clock High
Output Data Valid to Clock High
3
3
5
5
Waveforms
Figure 163. MMC Input-Output Waveforms
TCHCH
TCHCX
TCLCX
MCLK
TCHCL
TCLCH
TIVCH
TCHIX
MCMD Input
MDAT Input
TCHOX
TOVCH
MCMD Output
MDAT Output
224
AT8xC51SND2C
4341D–MP3–04/05
ATMEL [ ATMEL ]
