SBC-C23
SBC-C23 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: S.B. - Reviewed by L.B. -Copyright © 2020 SECO S.p.A.
24
3.3.3
Ethernet connectors
On board, there can be up to two FastEthernet interfaces, made available
by as many Micrel KSZ8091RNA 10Base-T/100Base-Tx Ethernet
Transceivers interfaced to NXP processor
’
s RGMII interfaces.
Connectors are type TRXCOM p/n TRJ19401BGNL or equivalent, with
2kV decoupling capacitor.
On the connectors there are also two LEDs: LED1 (Left LED, yellow) shows activity on the link
(when blinking); LED2 (Right LED, Green) turns on when a 10Mbps or 100Mbps connection
has been established.
/ETH1_Tx--: Ethernet Controller #1 Transmit differential pair.
/ETH1_Rx--: Ethernet Controller #1 Receive differential pair.
/ETH2_Tx--: Ethernet Controller #2 Transmit differential pair.
/ETH2_Rx--: Ethernet Controller #2 Receive differential pair.
The first Ethernet port is always available, while the second port is a factory option.
3.3.4
μ
SD card slot
The NXP i.MX6 SoloX processor embeds four Ultra Secured Digital Host controllers (uSDHC), able to support SD / SDIO / MMC
Cards.
For this reason, on SBC-C23 board there is also a socket, for the use of standard microSD cards, which
can be used as Mass Storage and/or Boot Devices.
The connector is a microSD connector, push-push type, H=2mm, type WELLCO TWF1 or equivalent.
SDIO_CD#: Card Detect Input.
SDIO_CLK: SD Clock Line (output).
SDIO_CMD: Command/Response bidirectional line.
SDIO_DAT[0÷3]: SD Card data bus. SDIO_DAT0 signal is used for all communication modes. SDIO_DAT[1÷3] signals are
required for 4-bit communication mode.
+3.3V
SDIO
voltage
is derived from NVCC_3V0 power rail. It can be switched on and off via SW (SDIO_PWR signal, managed using
the i.MX6 pad B15).
10/100 Ethernet Port #1 CN64
Pin Signal
Pin Signal
1
5
---
2
ETH1_Tx-
6
ETH1_Rx-
3
7
---
4
---
8
---
10/100 Ethernet Port #2 CN65
Pin Signal
Pin Signal
1
5
---
2
ETH2_Tx-
6
ETH2_Rx-
3
7
---
4
---
8
---
μ
SD Card Slot CN73
Pin
Signal
1
SDIO_DAT2
2
SDIO_DAT3
3
SDIO_CMD
4
+3.3V
SDIO
5
SDIO_CLK
6
GND
7
SDIO_DAT0
8
SDIO_DAT1
CardDetect
SDIO_CD#
