Thundercomm TurboX D845, Manual, Page: 24 / 49

Thundercomm
TurboX D845 System on Module
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SSC_SPI2_CLK CON2401 146
PX12
DO
SSC_SPI2_MISO CON2401 148
PX12
DI
Table 3.2- 8 SSC interface definition
3.2.9 SDIO Interface
The SOM support dual 4-laneSDIO, SDC2 connect to SD-card.
The SDIO is high-speed signal group. It should protect other sensitive signals/circuits from SD corruption, and
protect SD signals from noisy signals (clock, RF and so on).

The clock can be up to 200 MHz.

The signals routing should be 50ohm ±10% impedance control.

CLK to DATA/CMD length matching less than 1mm.

The spacing to all other signals should 2X line width

Maximum bus capacitance less than 1.0pF.

Each trace needs to be next to a ground plane.
SDIO (SDC2) Interface
PIN Name Location PIN Voltage Type Description Notes
SDC2_CLK CON2401 46
PX2
DO
SD card signals;
SD_CARD_DET_N need
pull up to PX3
SDC2_CMD CON2401 48
PX2
IO
SDC2_DATA3 CON2401 56
PX2
IO
SDC2_DATA2 CON2401 58
PX2
IO
SDC2_DATA1 CON2401 54
PX2
IO
SDC2_DATA0 CON2401 52
PX2
IO
SD_CARD_DET_N CON2401 50
PX3
DI
SDIO (SDC4) Interface
PIN Name Location PIN
Voltage
Type Description Notes
SDC4_DATA0 CON2401 81
PX3
IO
SDIO Signals
Compliant with SDIO
standard specification.
SDC4_DATA1 CON2401 83 PX3 IO
SDC4_DATA2 CON2401 87 PX3 IO
SDC4_DATA3 CON2401 89 PX3 IO
SDC4_CLK CON2401 85 PX3 DO
SDC4_CMD CON2401 91 PX3 IO
Table 3.2- 9 SDIO interface definition
3.2.10 QUP Interface
These GPIOs are available as Qualcomm universal peripheral (QUP) interface ports that can be configured for