參數(shù)資料
型號(hào)： romr0002
廠商： SIEMENS AG
英文描述： MultiMediaCard R0002 2 Mbyte ROM(多媒體卡 R0002 2 Mbyte ROM)
中文描述： 多媒體R0002 2字節(jié)的光盤(pán)（多媒體卡R0002 2字節(jié)光盤(pán)）
文件頁(yè)數(shù)： 32/41頁(yè)
文件大?。?/td> 207K
代理商： ROMR0002
Siemens
Product Manual R0002
Semiconductor Group
32
3.1
preted by the card:
For the R0002 the following minimum initialization and identification delays are defined:
The initialization delay is relevant only after the system power up (>1 ms, at least 64 clock cycles).
The identification delay is relevant for system power up and card hot insertion (> 1 ms). The R0002
ignores all commands until the sequence CMD1, CMD2 is received and the RCA of the card is ini-
tialized. The initialization delay guarantees enough time for V
DD
to reach the minimum operating
voltage on the MultiMediaCard bus. The identification delay guarantees enough time for V
DD
to
reach the minimum operating voltage internally in the MultiMediaCard.
Description
Symbol
Minimum Value
Initialization delay
t
init
1 ms
64 cycles
@ f
clk
>64kHz
@ f
clk
<64kHz
Identification delay
t
ident
1 ms
Table 23: Initialization and identification delays
Figure 16: Power up diagram
Supply voltage
time
Supply ramp up time
CMD1
CMD2
Identification delay
Power up time
Initialization delay
[1 ms, >64 clock cycles]
V
DD
min [2.0V]
V
DD
max [3.6V]
Minimum controller
operating voltage
[0V]
Logic
operating voltage range
Memory field
operating voltage range
[1 ms]
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