GESBC-9G20i
User’s
Manual
Version 0.2
Page 12 of 21
20-Sep-13
2 SCL
3 GND
Ethernet
The GESBC-9G20i Single Board Computer is shipped with support for a complete Ethernet
interface. The AT91SAM9G20 contains a MAC subsystem that is compliant with the ISO/TEC
802.3 topology for a single shared medium with several stations. The Media Access Controller
(MAC) within the AT91SAM9G20 supports 1/10/100 Mbps transfer rates and interfaces to
industry standard physical layer devices. The GESBC-9G20i is shipped with the DM9161A
100Base-X / 10Base-T Transceiver device which, along with a RJ45 connector, provides the
physical layer interface.
USB Port
The GESBC-9G20i Single Board Computer provides two USB host connections. The
AT91SAM9G20 USB host controller is configured for two root hub ports and features an
integrated transceiver for each port. The AT91SAM9G20 integrates two USB 2.0 Full Speed host
ports. These ports are fully compliant to the OHCI USB 2.0 Full Speed specification (12 Mbps).
The controller complies with the OHCI specification for USB Revision 1.1.
The GESBC-9G20i Single Board Computer provides one USB device port. The USB Device Port
(UDP) is compliant with the Universal Serial Bus (USB) V2.0 full-speed device specification.
The GESBC-9G20i Single Board Computer is shipped with one USB host port on standard USB
type-A connector and one USB host port on a 6 position 1mm spacing miniature connector that
can interface directly to Via VNT6656 USB WiFi module.
The GESBC-9G20i Single Board Computer is shipped with one standard USB type B device port
I/O Block
The GESBC-9G20i provides 8 protected digital input channels and 6 open collector digital output
channels. The digital input channels are protected up to 20V DC and the output channels are
capable to sink up to 200mA current. In addition the I/O block also provide one RS-232 port and
one RS-485 port. The I/O block uses 20 position 3.5mm spacing terminal block that accepts 18 –
28 gauge wires. The signal assignment is listed in table below.
Table 4 J8 I/O Expansion
Pin
I/O Line
Peripheral A
Peripheral B Comments
Function
1 PC16
Protected
digital
input
1
2 PC17
Protected
digital
input
2
3 PC18
Protected
digital
input
3
4 PC19
Protected
digital
input
4
5 PB20
RK0
ISI_D0
Protected
digital
input
5
