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參數(shù)資料
| 型號： | 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)： | 56/79頁 |
| 文件大?。?/td> | 516K |
| 代理商： | FLAS00XX |
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MultiMediaCard Flash
Preliminary MultiMediaCard Product Manual;
1998 SANDISK CORPORATION
Page 56 of 79
Table 5-16 TAAC Access Time Definition
TAAC Bit Position
Code
2:0
time unit
0=1ns, 1=10ns, 2=100ns, 3=1
μ
s, 4=10
μ
s, 5=100
μ
s, 6=1ms,
7=10ms
6:3
time value
0=reserved, 1=1.0, 2=1.2, 3=1.3, 4=1.5, 5=2.0, 6=2.5, 7=3.0,
8=3.5, 9=4.0, A=4.5, B=5.0, C=5.5, D=6.0, E=7.0, F=8.0
7
Reserved
NSAC
—Defines the worst case for the clock dependent factor of the data access time.
The unit for NSAC is 100 clock cycles. Therefore, the maximal value for the clock
dependent part of the data access time is 25.5k clock cycles.
The total access time N
AC
as expressed in the Table 5-27 is the sum of TAAC and NSAC. It
has to be computed by the host for the actual clock rate. The read access time should be
interpreted as a typical delay for the first data bit of a data block or stream.
TRAN_SPEED
—The following table defines the maximum data transfer rate
TRAN_SPEED:
Table 5-17 Maximum Data Transfer Rate Definition
TRAN_SPEED bit
Code
2:0
transfer rate unit
0=100kbit/s,
7=reserved
1=1Mbit/s,
2=10Mbit/s,
3=100Mbit/s,
4...
6:3
Time value
0=reserved, 1=1.0, 2=1.2, 3=1.3, 4=1.5, 5=2.0, 6=2.5, 7=3.0,
8=3.5, 9=4.0, A=4.5, B=5.0, C=5.5, D=6.0, E=7.0, F=8.0
7
Reserved
CCC—The MultiMediaCard command set is divided into subsets (command classes). The
card command class register CCC defines which command classes are supported by this
card. A value of ‘1’ in a CCC bit means that the corresponding command class is
supported. For command class definition refer to Table 5-2.
Table 5-18 Supported Card Command Classes
CCC bit
Supported Card Command Class
0
class 0
1
class 1
.........
11
class 11
READ_BL_LEN
—The data block length is computed as 2
READ_BL_LEN
. The block length
might therefore be in the range 1, 2,4...2048 bytes:
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