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Getting individual cards, as well as the whole
MultiMediaCard system, out of Idle State is up to
the responsibility of the bus master. Since t h e
power-up time and the supply ramp up time
depend on application parameters such as t h e
maximum number of MultiMediaCards, the bus
length and the power supply unit, the host must
ensure that the power is built up to the operating
level (the same level which will be specified in
CMD1) before CMD1 is transmitted.
4.4.2
Bus Operating Conditions
SPI Mode bus operating conditions are identical to MultiMediaCard Mode bus operating conditions. The
CS (chip select) signal timing is identical to the input signal timing. (See Figure 4-5.)
General
Parameter
Peak voltage on all lines
All Inputs
Input Leakage Current
All Outputs
Output Leakage Current
Power supply voltage
Parameter
Supply voltage
Supply voltage differentials (V
The current consumption of any card during the power-up procedure must not exceed 10 mA.
SanDisk MultiMediaCard Product Manual Rev. 2 © 2000 SANDISK CORPORATION
After power-up, the host starts the clock and
sends the initializing sequence on the CMD line.
This sequence is a contiguous stream of logical
ones. The sequence length is the maximum of one
msec, 74 clocks or the supply ramp up time. The
additional ten clocks (beyond the 64 clocks after
which
communication) are provided to eliminate power-
up synchronization problems.
Symbol
Symbol
V
D D
, V
)
SS1
SS2
MultiMediaCard Product Manual
the
card
should
M i n .
M a x .
Unit
-0.5
3.6
-10
10
-10
10
M i n .
M a x .
Unit
2 . 0
3 . 6
- 0 . 5
0 . 5
be
ready
for
Remark
V
A
A
Remark
V
V
23
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