LG -A290 Service Manual page 42

3.9.1 Pin Assignment
Since the controller can only be configured as either the host of Memory Stick or the host of SD/MMC Memory Card at
one time, pins for Memory Stick and SD/MMC Memory Card are shared in order to save pin counts. The following lists
pins required for Memory Stick and SD/MMD Memory Card. Figure 3.9. shows how they are shared. In Table 3.9.1, all
I/O pads have embedded both pull up and pull down resistor because they are shared by both the Memory Stick and SD/
MMC Memory Card. Pins ,4,5,8 are only useful for SD/MMC Memory Card. Pull down resistor for these pins can be used
for power saving. All embedded pull-up and pull-down resistors can be disabled by programming the corresponding
control registers if optimal pull-up or pull-down resistor are required on the system board. The pin VDDPD is used for
power saving. Power for Memory Stick or SD/MMC Memory Card can be shut down by programming the corresponding
control register. The pin WP(Write Protection) is only valid when the controller is configured for SD/MMC Memory Card. It
is used to detect the status of Write Protection Switch on SD/MMC Memory Card.
NO. Name
1 SD_CLK
 SD_DAT3
3 SD_DAT0
4 SD_DAT1
5 SD_DAT
6 SD_CMD
7 SD_PWRON
8 SD_WP
9 SD_INS
Table 3.9.1 Sharing of pins for Memory Stick and SD/MMC Memory Card controller
[ microSD CARD PIN_MAP ]
PIN NUMBER
T1
T
T3
T4
T5
T6
T7
T8
LGE Internal Use Only
Type MMC SD
0 CLK CLK
I/0/PP CD/DAT3
I/0/PP DAT0 DAT0
I/0/PP DAT1
I/0/PP DAT
I/0/PP CMD CMD
0
I
I VSS VSS
DESCRIPTION
DAT
CD/DAT3 
CMD
V
DD
CLK
Vss

DAT0
DAT1
MS MSPRO
SCLK SCLK
DAT3
SDI0 DAT0
DAT1
DAT
BS BS
INS INS
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3. TECHNICAL BRIEF
Description
Clock
Data Line [Bit 3]
Data Line [Bit 0]
Data Line [Bit 1]
Data Line [Bit ]
Command Or Bus State
VDD ON/OFF
Write Protection Switch in SD
Card Detection
microSD CARD
T3 T5 T7
T1
T2 T4 T6 T8
Only for training and service purposes