Apalis Carrier Board Design Guide - Toradex

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Apalis Carrier Board Design Guide2.10.1 Parallel Camera SignalsApalisPinApalisSignal NameI/OTypePowerRail187 CAM1_D0 I CMOS 3.3V185 CAM1_D1 I CMOS 3.3V183 CAM1_D2 I CMOS 3.3V181 CAM1_D3 I CMOS 3.3V179 CAM1_D4 I CMOS 3.3V177 CAM1_D5 I CMOS 3.3V175 CAM1_D6 I CMOS 3.3V173 CAM1_D7 I CMOS 3.3VDescriptionVideo input pixel data191 CAM1_PCLK I CMOS 3.3V Video input pixel clock195 CAM1_VSYNC I CMOS 3.3V Video input vertical sync197 CAM1_HSYNC I CMOS 3.3V Video input horizontal sync193 CAM1_MCLK O CMOS 3.3V201 I2C3_SDA I/O OD 3.3V203 I2C3_SCL O OD 3.3VMaster clock output for the camera. Some cameras might not need thisclock since they already use other clock sourcesCamera I 2 C interface - might be needed in the autofocus unitTable 20: Parallel Camera Signals2.10.2 Unused Parallel Camera Interface Signal TerminationAll unused parallel camera input signals can be left unconnected if the interface is disabled insoftware. These signals may be able to be used as GPIOs when they are not used as camerainterface. Please consult the applicable Apalis module datasheet.2.11 SD/MMC/SDIOThe Apalis module form factor features two SDIO interfaces as standard interfaces. One of theseinterfaces can provide up to 8 data bit which can be used for interfacing MMCplus cards andeMMC memory chips. The 8-bit interface is backward compatible with the 4bit data bus and canbe used for SD, SDIO and MMC devices. The SD and SDIO interface can only make use of the 4-bit wide data bus, as there is no 8-bit SD interface defined.The SD cards know different bus speed modes. The required signal voltage depends on the busspeed mode. For example the SDR104 mode requires 1.8V signaling. In the Apalis moduledefinition, all GPIO capable interfaces including the SD/MMC/SDIO are defined for 3.3V. SomeApalis modules might be capable to switch the voltages of the SD card interface pins to a 1.8V, butit is not mandatory. Read the relevant datasheet of the Apalis module.Even if the bus speed mode requires the signaling voltage of 1.8V, the supply of the card itself isstill 3.3V. Pay attention to the SD card signal pull-up resistors on the carrier board. If the 1.8Vmode is supported by the carrier board, the voltage for the pull-up resistors also needs to beswitchable. Few Apalis modules may allow removing the pull-up resistors on the carrier board andusing the internal ones only. In this case, it is the preferred solution. Even if the external pull-upresistors are not mandatory, we recommend adding unassembled pull-up resistors to the 3.3V railin order for it to be compatible with the future modules.Toradex AG l Altsagenstrasse 5 l 6048 Horw l Switzerland l +41 41 500 48 00 l www.toradex.com l info@toradex.com Page | 46
Apalis Carrier Board Design GuideBus Speed Mode Max. Clock Frequency Max. Bus Speed Signal VoltageDefault Speed 25 MHz 12.5 MB/s 3.3VHigh Speed 50 MHz 25 MB/s 3.3VSDR12 25 MHz 12.5 MB/s 1.8VSDR25 50 MHz 25 MB/s 1.8VDDR50 50 MHz 50 MB/s 1.8VSDR50 100 MHz 50 MB/s 1.8VSDR104 208 MHz 104 MB/s 1.8VTable 21: SD Card Bus Speed Modes2.11.1 SD/MMC/SDIO SignalsApalisPinApalisSignal NameI/OTypePowerRail160 MMC1_D0 I/O CMOS 3.3V162 MMC1_D1 I/O CMOS 3.3V144 MMC1_D2 I/O CMOS 3.3V146 MMC1_D3 I/O CMOS 3.3V148 MMC1_D4 I/O CMOS 3.3V152 MMC1_D5 I/O CMOS 3.3V156 MMC1_D6 I/O CMOS 3.3V158 MMC1_D7 I/O CMOS 3.3VDescriptionData signals [3:0] - used for SD, MMC and SDIO interfaces; addexternal pull-up resistorsData signals [7:0] - only needed for 8-bit MMC interface; add externalpull-up resistors; for 4bit MMC, SD and SDIO - leave this pinsunconnected150 MMC1_CMD I/O CMOS 3.3V Command signal - add external pull-up resistor154 MMC1_CLK O CMOS 3.3V Clock output164 MMC1_CD# I CMOS 3.3V Card detect, add pull-up resistor if card detect is usedTable 22: 8bit SD/MMC/SDIO signalsApalisPinApalisSignal NameI/OTypePowerRail186 SD1_D0 I/O CMOS 3.3V188 SD1_D1 I/O CMOS 3.3V176 SD1_D2 I/O CMOS 3.3V178 SD1_D3 I/O CMOS 3.3VDescriptionData signals [3:0] - used for SD, MMC and SDIO interfaces; addexternal pull-up resistors180 SD1_CMD I/O CMOS 3.3V Command signal - add external pull-up resistor184 SD1_CLK O CMOS 3.3V Clock output190 SD1_CD# I CMOS 3.3V Card detect -add pull-up resistor if card detect is used2.11.2 Reference SchematicsTable 23: 4bit SD/MMC/SDIO signalsEven if the selected module does not require pull-up resistors on the data and command lines, it isrecommended to place such resistors in the customer design and not just assemble them. Thisensures that the module is compatible with other Apalis modules. There is no dedicated writeprotectionsignal available on the standard Apalis pin-out. Any free GPIO capable signal can beused if the write-protection function is required.Toradex AG l Altsagenstrasse 5 l 6048 Horw l Switzerland l +41 41 500 48 00 l www.toradex.com l info@toradex.com Page | 47
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