Specifications

40
USB
NOTE: only available on EM-X270 – rev1.3 and higher.
The PXA270 USB host port is routed to the extender board connector through the on-board
USB hub.
EM-X270
Name
Type Description
EXT_USB_DP I/O USB differential data plus.
EXT_USB_DM I/O USB differential data minus.
UART
The PXA270 FF-UART signals are routed to the extender board connector.
NOTE: The signals are at 3V levels.
EM-X270
Name
PXA270
Name
Type Description
FFUART_TXD FF_TXD Output Serial data output
FFUART_RXD FF_RXD Input Serial data input
FFUART_RTS FF_nRTS Output Request to send signal
FFUART_DTR FF_nDTR Output Data terminal ready signal
FFUART_DSR FF_nDSR Input Data set ready signal
FFUART_CTS FF_nCTS Input Clear to send signal
FFUART_DCD FF_nDCD Input Data carrier detect signal
SSP - Synchronous Serial Protocol
The SSP is a synchronous serial interface that connects to a variety of external analog-to-
digital (A/D) converters, telecommunication CODEC’s and other devices that use serial
protocols for data transfer. The SSP provides support for the following protocols:
 Texas Instruments (TI) Synchronous Serial Protocol
 Motorola Serial Peripheral Interface (SPI) protocol
 National Semiconductor Microwire
 Programmable Serial Protocol (PSP)
The SSP operates as a full-duplex device for the TI Synchronous Serial Protocol, SPI, and
PSP protocols and as a half-duplex device for the Microwire protocol. The FIFO’s can be
loaded or emptied by the CPU using programmed I/O or DMA burst transfers.
SSP port #1 of the PXA270 is routed to the extender board connector.