Specifications
Functional Description
30-Dec-2010 CM-X300 Reference Guide Rev 1.31 25
7- or 8-bit characters
Even, odd, or no parity detection
1 stop-bit generation
Baud-rate generation of 9.6K to 3.6M bps for all UARTs
False start-bit detection
64-byte Transmit FIFO
64-byte Receive FIFO
Complete status-reporting capability
Ability to generate and detect line breaks
Internal diagnostic capabilities that include:
Loopback controls for communications link fault isolation
Break, parity, and framing-error simulation
Fully prioritized interrupt system controls
Separate DMA requests for transmit and receive data services
Serial infrared asynchronous interface that conforms to the Infrared Data
Association (IrDA) specification
3.3.5.1 Full-Function UART
This is the CPU‘s UART1. The interface is routed to the CAMI COM-C serial port and
uses TTL-levels signaling. The port‘s pin descriptions are listed in Table 15.
Note: In module configuration C624M (PXA310 processor) these pins are re-defined for
use with the USB interface and not available on CAMI.
Table 15 Full-Function UART Signals
CM-X300 Signal
Name
Type
Description
COM-C-RX
I
Serial Data In: receives the serial data from the external serial device or
DCE into the internal serial port controller.
COM-C-TX
O
Serial Data Out: transmits the serial data from the internal serial port
controller to the external serial device or DCE.
COM-C-CTS#
I
Clear To Send: is sent back to the serial port to indicate that the external
data carrier equipment (DCE) is ready to accept data.
COM-C-RTS#
O
Request To Send: indicates to the external DCE that the internal serial port
controller is ready to send data.
COM-C-DSR#
I
Data Set Ready: indicates that the external DCE is ready to establish a
communication link with the serial port controller.
COM-C-DTR#
O
Data Terminal Ready: indicates to the external DCE that the serial port
controller is ready to communicate.
COM-C-DCD#
I
Data Carrier Detect: is sent back to the serial port from data carrier
equipment when it detects a carrier signal from a communications target.
COM-C-RIN#
I
Ring Indicate: is used by an external modem to inform the serial port that a
ring signal has been detected. A change in state on this signal by the
external modem can be configured to cause a modem status interrupt.
3.3.5.2 Console UART
This is the CPU‘s UART3. The interface is routed to the CAMI COM-A serial port and
uses RS-232-levels signaling. The port‘s pin descriptions are listed in Table 16.
Table 16 Console UART Signals
CM-X300 Signal
Name
Type
Description
COM-A-RX#
I
Serial Data In: receives the serial data from the external serial device or
DCE into the internal serial port controller.