Seco Smarc LEVY User Manual page 32

0x25 USB Hub
I2C_CAM1_CK: CSI Port #1 dedicated I2C Bus Clock signal, Bi-Directional, electrical level +1.8V_RUN with a 2k2Ω pull-up resistor.
I2C_CAM1_DAT: CSI Port #1 dedicated I2C Bus Data signal, Bi-Directional, electrical level +1.8V_RUN with a 2k2Ω pull-up resistor.
On this bus a selection of addresses must be left reserved for on-board peripherals as presented in this table:
I2C3 Bus
Address Peripheral
0x68 PCIe Clock Generator
0x20 I/O Expander
3.2.2.5 SDI/O interface signals
The NXP i.MX 8M Plus processors offer many different SDIO interfaces, that can be used independently one from the other to implement different mass storages
(internal eMMC, internal SD Card, external SDI/O interface).
The SDIO3 signals of the processor are used for the onboard eMMC storage of the module.
The SDIO1 signals of the processor are used for the factory optional onboard WiFi/BTLE module.
The SDIO2 interface of the processor is externally accessible through the edge connector of the module. Supporting 4-bit mode as per the SMARC specification.
The uSDHC controller complies with:
•
SD Host Controller Standard Specification version 3.0 with SDR104 signaling to support up to 104MB/sec.
•
MMC System Specification version 5.0
The edge accessible SDIO2 signals are as follows:
SDIO_WP: Write Protect bidirectional signal, electrical level +3.3V_RUN with a 10kΩ pull-up resistor. It is used to communicate the status of Write Protect switch on
external SD/MMC card.
SDIO_CMD: Command/Response line. Bidirectional signal, electrical level +3.3V_RUN, used to send command from Host (i.MX 8M processor) to the connected
card, and to send the response from the card to the Host.
SDIO_CD#: Card Detect Input. Active Low Signal, electrical level +3.3V_RUN with 10kΩ pull-up resistor. This signal must be externally pulled low to signal that a
SDIO/MMC Card is present.
SDIO_CK: Clock Line (output), up to 200MHz maximum frequency for SDR104 Mode (4-bit only).
SDIO_PWR_EN: SDIO Power Enable output, active high signal, electrical level +3.3V_RUN. It is used to enable the power line supplying SD/SDIO/MMC devices.
LEVY
LEVY User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: S.O. - Reviewed by N.P. - Copyright © 2022 SECO S.p.A.
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