27
uSDHC
S32G
MAX4886
SD0_D0
SD0_D1
SD0_D2
SD0_D3
SD0_D4
SD0_D5
SD0_D6
SD0_D7
eMMC_DATA0
uSDHC_D5
uSDHC_D1
uSDHC_D2
uSDHC_D4
uSDHC_D3
uSDHC_D6
COM1+
COM1-
uSDHC_D7
COM2+
COM2-
COM3+
COM3-
COM4+
COM4-
NC1-
NC1+
NO1-
NO1+
NC2-
NC2+
NO2-
NO2+
NC3-
NC3+
NO3-
NO3+
NC4-
NC4+
NO4-
NO4+
MAX4886
COM1+
COM1-
COM2+
COM2-
COM3+
COM3-
COM4+
COM4-
SD0_CMD
SD0_CLK
SD0_RST
SD0_DQS
NC1-
NC1+
NO1-
NO1+
NC2-
NC2+
NO2-
NO2+
NC3-
NC3+
NO3-
NO3+
NC4-
NC4+
NO4-
NO4+
eMMC_DATA1
eMMC_DATA2
eMMC_DATA3
eMMC_DATA4
eMMC_DATA5
eMMC_DATA6
eMMC_DATA7
SD_DATA0
SD_DATA1
SD_DATA2
SD_DATA3
eMMC_CMD
SD_CMD
eMMC_CLOCK
SD_CLOCK
eMMC_DQS
eMMC_RST
uSDHC_D0
DAT0
DAT1
DAT2
DAT3
DAT4
DAT5
DAT6
DAT7
CMD
CLOCK
DQS
RST
CMD
CLOCK
DAT0
DAT1
DAT2
DAT3
eMMC
SD
ON
OFF
SEL
SEL
SW3
Figure 10. Connections between S32G274A and SD/eMMC
There are two analog switches (MAX4886) between the connections shown in the figure above. One analog
switch is used for multiplexing control signals, and the other is used for multiplexing data signals.
When SW3 is ON, SD card is selected; When SW3 is OFF, the eMMC card is selected.
3.8 SerDes interfaces
The S32G274A on the S32G-VNP-GLDBOX has two independent SerDes modules, and each of them
supports two lanes. The S32G-VNP-GLDBOX supports both SGMII mode and PCIe mode.
The table 15 and table 16 describe the SerDes_0/1 supported work modes and corresponding settings on
S32G-VNP-GLDBOX.
Table 15. SerDes_0 work modes and corresponding settings
SerDes_0
SW17
Mode
PHY Lan
Connection
Clock
OFF
PCIe only
Lan0
Lan1
PCIe0_X2 mode
M.2 E-key
slot
100MHZ
(External)
ON
(Default)
PCIe only
Lan0
Lan1
PCIe0_X2 mode
M.2 M-key
slot
100MHZ
(External)