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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: 7/41頁
文件大?。?/td> 207K
代理商: ROMR0002
Siemens
Product Manual R0002
Semiconductor Group
7
3.1
4
Interface
In the R0002 all data is transferred over a minimal number of lines:
CLK: with each cycle of this signal a one bit transfer on the command and data lines is done. The
frequency may vary between zero and the maximum clock frequency. The MultiMediaCard bus
master is free to generate these cycles without restrictions in the range of 0-20MHz.
CMD: is a bidirectional command channel used for card initialization and data transfer com-
mands. The CMD signal has two operation modes: open drain for initialization mode and push
pull for fast command transfer. Commands are sent from the MultiMediaCard bus master to the
R0002 and responses vice versa.
DAT: is a data channel with a width of one line. The DAT signal of the R0002 operates in push
pull mode.
All MultiMediaCards are connected directly to the lines of the MultiMediaCard bus. The following
table defines the card contacts.
1
S: power supply; I: input; PP: push pull output; OD: open drain output
Pin No.
Name
Type
1
Description
1
2
3
4
5
6
7
NC
CMD
VSS1
VDD
CLK
VSS2
DAT
--
I/PP/OD
S
S
I
S
PP
not connected
Command/Response
Supply voltage ground
Supply voltage
Clock
Supply voltage ground
Data output
Table 1: R0002 pad definition
Figure 2: R0002 interface
CMD
DAT
CLK
MultiMediaCard
Host
1 2 3 4 5 6 7
R0002
R
DAT
R
OD
R
CMD
I
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