Hardware Design Specification
ASD-B-16-0247 Rev1.3
Page 23 of 105
September 8, 2017
RTK00V2XRC7746SFS
3.6
SD Card Host Interface (SDHI2)
3.6.1
Specifications
The Tethys board incorporates a SD card slot (CN2) and a mini-PCI Express CN (CN12) for the on-chip SD card host interface
(SDHI2) of the R-Car W2H. For details on the SDHI2, please refer to the R-Car W2H hardware manual. CN12 and CN2 can not be
used at the same time.
Table 9 Specifications of SD Card Host Interface (SDHI2)
SD Host Interface
On-chip SDHI2 in the R-Car W2H
Voltage control for VDD
VCCQ_SD2 =3.3V/1.8V it can be switched by software , D3.3V=3.3V
SD Card Slot
503182-1852(CN2) from Molex
3.6.2
Block Diagram
R-Car W2H
SDHI2
SD2_CLK
SD2_DATA[3:0]
SD2_CD
SD2_WP
SD2_CMD
VCCQ_SD2
47K
100
33
33
33
33
CLK
DATA[3:0]
WP
CD
CMD
SD Slot
CN2
D3.3V
D3.3V
Figure 6 Block Diagram of the SDHI2 Interface