User manual

16 GR-UT699 Development Board
User Manual
2.6 Serial Interface
The UT699RH ASIC, provides a single Serial port, with TXD/RXD pins, and the GR-UT699
board provides an RS232 driver/receiver chip and routes these signals to a front panel
connector.
The front panel connector type for the UART interface is Female D-Sub 9 pin type with a
standard pin-out for serial links.
2.7 Debug Support Unit (DSU) Serial Interface
The GR-UT699 unit provides a interface for Debug and control of the processor by means of
a host terminal via the DSU serial link to the UT699 ASIC, as represented in Figure 2-8.
The board provides two possibilities for connecting to the processor's DSU interface:
1. USB MiniAB connector with USB to Serial interface chip
2. JTAG DSU interface
The baud rate of the serial link is specified by the host computer, and the DSU interface in
the UT699 ASIC auto-detects and adjusts its baud rate to suit.
The DSUENable signal input to the processor is connected to a jumper on the PCB. In
© Aeroflex Gaisler AB March 2013, Rev. 0.6
Figure 2-8: Debug Support Unit connections
Figure 2-7: Serial interface
UT699RH
ASIC
DSUTX←
DSURX→
DSUBRE→
DSUACT←
DSUEN→
DSU I/F
HOST
TERMINAL/COMPUTER
USB-SERIAL
JTAG
USB to SERIAL
CONVERTER
UT699RH
ASIC
RS232
INTERFACE
SUB-D 9 pin
Female
RS232
DRIVER/
RECEIVERS
TXD
RXD