Sd/Mmc Host Interface (4 Bits) - Renesas RZ/A Series User Manual

RZ/A2M CPU Board RTK7921053C00000BE
2.11

SD/MMC Host Interface (4 bits)

RTK7921053C00000BE contains a 4 bit microSD slot connected to the SD/MMC host interface in the RZ/A2M.
SD/MMC host interface ch0 terminal operational voltage can be changed via the PD_1 terminal. Set PD_1 to High for
3.3V operation and to Low for 1.8V operation.
Figure 2.11.1 shows the SD/MMC host interface block diagram. Table 2.11.1 shows the PVcc_SD0 voltage switching
table.
RZ/A2M (U1)
SDVcc
PVcc_SD0 PD_1 (SDVcc_SEL)
Power switch (U4)
SDVcc
VOUT
3.3V
VINB
1.8V
VINA
Note: Red characters
functions in use.
: Unmounted.
Figure 2.11.1 SD/MMC Host Interface Block Diagram
Table 2.11.1 PVcc_SD0 Voltage Switching Table
Terminal
PD_1 Supplies 3.3V to PVcc_SD0. (Initial setting)
R20UT4397EJ0100 Rev.1.00
2018.10.11
SD0_CLK
SDVcc
SD0_CMD
SD0_DAT[7:4]
3.3V
SD0_DAT[3:0]
3.3V
P5_0 / SD0_CD
P5_1 / SD0_WP
SD0_RST#
TP1
3.3V
3.3V
EN
SEL
0 : VOUT=VINA=1.8V
1 : VOUT=VINB=3.3V
indicate
High
7
CLK CLK
SDVcc
CMD CMD
D[3:0]
D[3:0] CD
CD
function
Supplies 1.8V to PVcc_SD0.
2. Function specifications
microSD card slot (CN1)
SDVcc
CLK
CMD
DAT[3:0]
CD
0 : Card Insert
Low
3.3V
VDD
2-27