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參數資料
| 型號： | 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字節的光盤（多媒體卡R0002 2字節光盤） |
| 文件頁數： | 12/41頁 |
| 文件大小： | 207K |
| 代理商： | ROMR0002 |
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Siemens
Product Manual R0002
Semiconductor Group
12
3.1
The value for the asynchronous delay for the R0002 is 0.6
μ
s. The coded TAAC value is 0x6A. For
more details see "Chapter 10.2.4: Operating characteristics".
NSAC
Defines the worst case for the synchronous data access time. N
AC
is defined as 100*NSAC clock
cycles, where NSAC represents a binary value. Max. value for the data access time N
AC
is 25.6k
clock cycles.
The total access time is the sum of both TAAC and N
AC
* clock period. The value of NSAC for the
R0002 is 0x01 (100 cycles). For more details see "Chapter 10.2.4: Operating characteristics".
TRAN_SPEED
The following table defines the maximum data transfer rate TRAN_SPEED:
The R0002 supports a transfer rate between 0 and 20 Mbit/s.The parameter TRAN_SPEED is
0x2A.
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 set CCC bit
means that the corresponding command class is supported. For command class definition refer to
Table 15.
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
always ‘0’
TRAN_SPEED bit
Description
2:0
transfer rate unit
0=100kbit/s, 1=1Mbit/s, 2=10Mbit/s,
3=100Mbit/s, 4... 7=reserved
time value
0x0=reserved, 0x1=1.0, 0x2=1.2, 0x3=1.3,
0x4=1.5, 0x5=2.0, 0x6=2.5, 0x7=3.0, 0x8=3.5,
0x9=4.0, 0xA=4.5, 0xB=5.0, 0xC=5.5,
0xD=6.0, 0xE=7.0, 0xF=8.0
reserved=’0’
6:3
7
Table 8: Maximum data transfer rate definition
CCC bit
Supported card command class
0
1
class 0
class 1
......
11
class 11
Table 9: Supported card command classes
TAAC bit
Description
Values
Table 7: TAAC access time definition
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