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Developer Board and Interfaces Description
3.4.2
Communication Interfaces
The g20 Developer Board includes three serial interfaces:
• RS232
• USB
• SPI
The RS232 and USB ports are multiplexed within the g20, and therefore cannot be operated simultaneously. The default connec-
tion is RS232.
The USB and RS232 is not detected dynamically. The selected serial connection is determined by the USB cable connection at
power up. If the USB cable is connected (and the PC is on), then USB is selected. Otherwise, RS232 is selected.
The SPI RS232 interface is used for debugging.
USB
RS232-1
RS232-2 (SPI)
Connector
Connector
Connector
Figure 13. USB, RS232 and DIAG (SPI) Connectors
Each of these serial interfaces is described in the sections that follow.
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