MC56U032NCFA Samsung Semiconductor, Inc., MC56U032NCFA Datasheet - Page 18

• Manufacturer Part Number: MC56U032NCFA
• Description: Flash Card
• Manufacturer: Samsung Semiconductor, Inc.

4.2 Pin Assignments in SPI Mode
4.3 MultiMediaCard Bus Topology
Figure 4-2 Bus Circuitry Diagram
MultiMediaCard
Table 4- 2 SPI Pad Definition
The MultiMediaCard bus has three communication lines and four supply lines:
-
-
-
-
-
The R
transitions. R
floating when no card is inserted or when all card drivers are in a hi-impedance mode. A constant
current source can replace the R
CMD: Command is a bi-directional signal. Host and card drivers are operating in two modes, open
DAT: Data is a bi-directional signal. Host and card drivers are operating in push pull mode.
CLK: Clock is a host to card signal. CLK operates in push pull mode.
VDD: VDD is the power supply line for all cards.
VSS[1:2]: VSS are two ground lines.
Note : 1. S: power supply; I: input; O: output; PP: push-pull; OD: open-drain; NC: No connection or V
Pin No.
1
2
3
4
5
6
7
OD
drain and push pull.
is switched on and off by the host synchronously to the open-drain and push-pull mode
DAT
and R
TM
CMD
Name
CS
DI
V
V
SCLK
V
DO
are pull-up resistors protecting the CMD and the DAT line against bus
ss
cc
ss2
OD
by achieving a better performance (constant slopes for the signal
Type
I
I
S
S
I
S
O/PP
*1
Description
Chip Select
Data In
Ground
Power supply
Clock
Ground
Data out
IH
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