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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： | 24/41頁 |
| 文件大小： | 207K |
| 代理商： | ROMR0002 |
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Siemens
Product Manual R0002
Semiconductor Group
24
3.1
6.7
Command and response timings
All timing diagrams use the following schematics and abbreviations:
The difference between the P-bit and Z-bit is that a P-bit is actively driven to HIGH by the card
respectively host output driver, while the Z-bit is driven to (respectively kept) HIGH by the pull-up
resistors R
CMD
respectively R
DAT
. Actively-driven P-bits are less sensitive to noise superposition.
For the timing of the R0002 the following values are defined:
12:9
CURRENT_STATE
S X
0 = idle
1 = ready
2 = ident
3 = stby
4 = tran
5 = data
6-15 = reserved
Current state of the card.
B
8
Don’t care
Permanently 0.
7:0
reserved
Permanently 0.
S
T
P
E
Z
D
*
Start bit (= 0)
Transmitter bit (Host = 1, Card = 0)
One-cycle pull-up (= 1)
End bit (=1)
high impedance state (-> = 1)
Data bits
repeater
Cyclic redundancy check bits (7 bits)
Card active
Host active
CRC
Table 20: Timing diagram symbols
Value [clock cycles]
Description
N
CR
3
Number of cycles between
command and response
Number of cycles between
card identification or card
operation conditions com-
mand and the correspond-
ing response
N
ID
5
N
AC
≥
3
1
Table 21: Timing values
Bits
Identifier
Type
Value
Description
Clear
Condition
Table 19: Status
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