Hardware Description
14
November 28, 2011
Functional Description
This section describes the IDM-SBC’s hardware design in detail.
Microcontroller
The Stellaris LM39B92 is an ARM Cortex-M3-based microcontroller with 256-KB flash memory,
80-MHz operation, Ethernet, USB, EPI and a wide range of peripherals. See the LM39B92 data
sheet (order number DS-LM39B92) for complete device details.
The IDM-SBC’s LM39B92 microcontroller is factory programmed with a quickstart demo program.
The quickstart program resides in on-chip flash memory and runs each time power is applied,
unless the quickstart has been replaced with a user program.
Debugging
The microcontroller supports JTAG and SWD debugging as well as SWO trace capabilities. To
minimize board area, the IDM-SBC uses a 0.050” pitch header (J6) which matches ARM’s
fine-pitch definition (Figure 2-2). Some in-circuit debuggers provide a matching connector. Other
debuggers can be used with the MDL-ADA2 adaptor board included in the RDK.
Figure 2-2.
Debug Connection Pinout
Expansion Connector
UART0 signals from the microcontroller are available on J4, an internal expansion connector. The
pin-out of this connector is compatible with the power/UART cable used by the ICDI board
included in the EK-LM3S9B90 and EK-LM3S9B92 evaluation kits. This then provides a convenient
Virtual Com port interface to a PC. A pair of I
2
C signals are also available, however, jumpers
connecting SCL and SDA are normally omitted to avoid conflict with digital signals from the ICDI
board.
Figure 2-3.
Expansion Connector
1
1. Revision A PCBs transpose UART0 RX and TX signals and are, therefore, incompatible with ICDI connections.
1
2
9 10
TMS/ SWDIO
TCK/ SWCLK
TDO
TDI
SRSTn
3.3V
GND
GND
n/c
GND
1
2
7 8
UART0 TX
UART0 RX
SCL (opt)
n/c
SDA (opt )
GND
GND
n/c
Summary of Contents for Stellaris RDK-IDM-SBC
Page 4: ...4 November 28 2011 ...
Page 6: ...6 November 28 2011 ...
Page 8: ...8 November 28 2011 ...
Page 20: ...Hardware Description 20 November 28 2011 ...
Page 24: ...Software Development 24 November 28 2011 ...
Page 32: ...32 November 28 2011 ...
