Microsd Interface Card - LG U400 Service Manual

3.1.11 MicroSD Interface card

U400 supports the MicroSD card interface as external memory card. MicroSD card has 4-data line, so
U400 uses 4-data line. All control and data line is connected to MARIKA.
Cause of the difference between MARIKA and MicroSD card, a level shifter should be added.
MICROSD_DETECT
MICROSD_CMD
MICROSD_CLK
MICROSD_DAT
VDDG27
• Card detection
- When there are no card in MicroSD card socket, MICROSD_DETECT pin is high cause of an
internal pull-up from the level shifter.
- If card is inserted in socket, because TransFlash has internal pull-up, MICROSD_DETECT pin
changes Low.
- VDDG27 always supply power.
- If card is removed, MICROSD_DETECT pin changes high.
MICROSD_CMDDIR
MICROSD_CMD
MICROSD_DATDIR
MICROSD_DAT0
MICROSD_DAT1
MICROSD_DAT2
MICROSD_DAT3
MICROSD_CLK
MICROSD_CLKRET
MICROSD_DETECT
Figure 3-1-12. TransFlash and Schematic of TransFlash Interface
MicroSD card Interface
Card detection, connected to GPIO47 of MARIKA
Command/Response
Clock
Data line
Supply voltage from Vincenne2 internal LDO
Table 3-1-6. TransFlash Interface
VDDE18
TP599 TP598
U500
B3
VCCA
A2
CMD_DIR
D2
CMD_H
A3
DAT0_DIR
D1
DAT0_H
E3
DAT123_DIR
E1
DAT1_H
A1
DAT2_H
B1
DAT3_H
C1
CLK_H
R598
E2
CLK_F
0
E4
WP
R507
D3
CD
0
C3
GND1
C500
0.1u
- 39 -
3. Technical Brief
VDDG27
ST6G3238ETBR
B4
VCCB
D4
CMD
D5
DAT0
E5
DAT1
A5
DAT2
B5
DAT3
C5
CLK MICROSD_CLK_27
C4
GND2
C501
0.1u
05.08.31 Add ST6G3238ETBR
MICROSD_CMD_27
MICROSD_DAT0_27
MICROSD_DAT1_27
MICROSD_DAT2_27
MICROSD_DAT3_27