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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： | 31/41頁 |
| 文件大小： | 207K |
| 代理商： | ROMR0002 |
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Siemens
Product Manual R0002
Semiconductor Group
31
3.1
9
Power supply
9.1
Power supply decoupling
The VSS1, VSS2 and VDD lines supply the card with operating voltage. A decoupling capacitor (C)
for current peak buffering has to be foreseen. This capacitor is placed on the bus side correspond-
ing to Figure 14.
9.2
Power on
Each card has its own power on detection circuitry which puts the card into a defined state after the
power-on. No explicit reset signal is necessary. The cards can also be reset by a special software
command: GO_IDLE_STATE (CMD0). In case of emergency the host may also reset the cards by
switching the power supply off and on again.
A power-on-reset is generated on chip as long as V
DD
is below a certain value. After the power on
reset the command parser of the R0002 works properly, but the access to the memory core is not
guaranteed as long as V
DD min
is not reached. Therefore in the power up phase (or when the R0002
is inserted during power up) the host has to wait after sending the
SEND_OP_COND command
(CMD1) for the identification delay. After that the
ALL_SEND_CID
command(CMD2) can be inter-
Length
max
= 13 mm
VSS1
VSS2
VDD
Card
single card slot
single card slot
Figure 14: Power supply decoupling
C
Figure 15: Power on detection
V
SS
V
DD
power up
detection
CLK
CMD
DAT
MultiMediaCard controller
ASYNC. RESET
command
parser
core
controller
memory
core
ENABLE
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