參數(shù)資料
型號(hào)： flas00xx
廠商： SIEMENS AG
英文描述： MultiMediaCard(多媒體卡)
中文描述： 多媒體卡（多媒體卡）
文件頁數(shù)： 28/79頁
文件大?。?/td> 516K
代理商： FLAS00XX
MultiMediaCard Flash
Preliminary MultiMediaCard Product Manual;
1998 SANDISK CORPORATION
Page 28 of 79
Table 4-4 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
(PP)
f
PP
0
20
MHz
C
L
#
100 pF
(10 cards)
Clock Frequency Identification Mode
(OD)
f
OD
0
400
kHz
C
L
#
250 pF
(30 cards)
Clock Low Time
t
WL
10
ns
C
L
#
100 pF
(10 cards)
Clock High Time
t
WH
10
ns
C
L
#
100 pF
(10 cards)
Clock Rise Time
t
TLH
10
ns
C
L
#
100 pF
(10 cards)
Clock Fall Time
t
THL
10
nc
C
L
#
100 pF
(10 cards)
Clock Low Time
t
WL
50
ns
C
L
#
250 pF
(30 cards)
Clock High Time
t
WH
50
ns
C
L
#
250 pF
(30 cards)
Clock Rise Time
t
TLH
50
ns
C
L
#
250 pF
(30 cards)
Clock Fall Time
t
THL
50
ns
C
L
#
250 pF
(30 cards)
Inputs CMD, DAT (referenced to CLK)
Input set-up time
t
ISU
3
ns
Input hold time
t
IH
3
ns
Outputs CMD, DAT (referenced to CLK)
Output set-up time
t
OSU
5
ns
Output hold time
t
OH
5
ns
4.4.2 SPI Mode Bus Operating Conditions
SPI Mode bus operating conditions are identical to MultiMediaCard Mode bus operating
conditions.
4.5 MultiMediaCard Registers
4.5.1 Operating Conditions Register (OCR)
The 32-bit operation conditions register stores the V
DD
voltage profile of the card. The
MultiMediaCard is capable of communicating (execute the acquisition and identification
procedure) with any standard MultiMediaCard host using operating voltages form 2 to 3.6
Volts. Accessing the data in the memory array, however, requires 2.7 to 3.6 Volts. The
OCR shows the voltage range in which the card data can be accessed. The least
significant 31 bits are constant and will be set as described in Figure 4-7. Bit 32 is the busy
bit as defined in the MultiMediaCard specification document.
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