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Page 17 of 92
RZ/G1H Qseven SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
2.4.3
eMMC Flash
The RZ/G1H Qseven SOM supports 8GB eMMC Flash memory as mass storage. eMMC is directly connected to the
MMCIF controller of the RZ/G1H CPU which supports MMC 4.41 and operating at 3.3V Voltage level. The eMMC flash
memory is physically located on bottom side of the Qseven SOM. The memory size of the eMMC Flash can be
expandable.
In RZ/G1H CPU, MMCIF Data7 and VIN1 clock is multiplexed in same pin
“
GP3_15
”
and so eMMC will operate only in
4bit mode when VIN1 is supported. A bus switch
is provided for “
GP3_15
” pin
which is controlled by a DIP switch (SW3)
to select between eMMC 8bit and VIN1.
If the DIP switch is set to “OFF” position, then
eMMC will work in 8bit mode
and VIN1 cannot be supported
. If the DIP switch is set to “ON” positi
on, then VIN1 can be supported and eMMC will
work only in 4bit mode. This DIP switch position can be read by software
though GPIO pin “GP4_12”.
Note: For more details on DIP switch (SW3), refer
2.5
RTC Controller
The RZ/G1H Qseven SOM supports external RTC
Controller “
PCF85263A
”
On-SOM for Real time clock support. This
external RTC Controller is connected to the RZ/G1H CPU through I2C0 Interface with slave address 0x51 and operates
at 3.3V voltage level. In SOM power off condition, this device will take power from Qseven Edge (VCC_RTC) coin cell
power input (Pin 193) and continues to keep the current time.
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