Specifications

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4.3. RS232 (P2)
The FF-UART of the PXA270 is connected to the on-board RS232 driver and to the
extender board connector (see section 4.15 for details).
The RS232 driver signals are routed to the RS232 ultra-mini connector (P2).
Connector P2, ultra-mini serial, RS232 levels:
Pin Signal Name Pin Signal Name
1 RS232_TXD 5 RS232_DTR
2 RS232_RTS 6 RS232_DSR
3 RS232_RXD 7 RS232_DCD
4 RS232_CTS 8 GND
Note: the Ring Indicator signal is not available.
Connector data:
Manufacturer Mfg. P/N Mating connector
Wieson G3169-500001 Wieson, P/N: 4306-5000
The connector is compatible with the "DB9-F to Ultra Mini Plug" cable available from
CompuLab.
4.4. MMC/SDIO/SD (P5)
The EM-X270’s MMC/SDIO/SD interface is based on the MMC controller of the PXA270
processor. The controller acts as a link between the software that accesses the PXA270
processor and the MMC stack (a set of memory cards) and supports Multimedia Card,
Secure Digital, and Secure Digital I/O communications protocols. The MMC controller in
the PXA270 processor is based on the standards outlined in the “Multimedia Card System
Specification Version 3.2”. The SD controller supports one SD or SDIO card based on the
standards outlined in the “SD Memory Card Specification Version 1.01” and “SDIO Card
Specification Version 1.0 (Draft 4)”.
The MMC controller signals are routed to the on-board SD socket (P5).