Eurotech PXA320, Руководство пользователя

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Graphics ClientM User Manual
110120-1000A
22
Inputs and Outputs
To meet the requirement for general-purpose I/O and specialized I/O capabilities, the
GCM includes up to twenty seven GPIOs and the ADSmartIO. The following sections
describe these capabilities.
General-Purpose Inputs and Outputs
The GCM supplies up to twenty seven GPIOs. Up to twenty two GPIOs interface to the
PXA320, while five interface to the on-board CPLD. For electrical specifications, see
PXA320 Processor , page 47 and CPLD , page 48 .
The following table describes the GPIO signals.
Header Number of GPIO Device
J21: GPIO, I2C, and CSI (optional) , page 41 up to 12 PXA320
J22: GPIO and Serial 1 (EIA-422/485) , page 43
10 PXA320
5 CPLD
Note: The CSI option and USB 2.0 client option each use ten of the twelve
GPIOs on socket J21. For further details about these volume production
options, see USB Ports , page 14 .
ADSmartIO
ADSmartIO is a RISC microcontroller programmed to provide additional I/O functionality
for specialized tasks. It can perform a wide variety of functions; however, the actual
functions implemented depend on the firmware loaded on your GCM. Contact your local
Eurotech technical support for a complete list of the ADSmartIO functionality.
The following are the ADSmartIO functions supported on the GCM:
• Digital I/Os
• A/D inputs
• Keypad scan
The ADSmartIO controller has four, 8-pin I/O ports named PA, PB, PC, and PD. Some of
these ports' pins are used internally, while nineteen I/O ports are available for your
application. Generally, ADSmartIO ports are referenced by port and pin number (for
example PA2), but I/O signals may go by several names based on functionality. For the
cross reference between functionality and ADSmartIO signal names, see header J11 ,
page 35 .
The ADSmartIO Programmer's Reference (Eurotech document 110110-4004) gives
information about how to use the ADSmartIO features. For electrical specifications, see
ADSmartIO , page 50 .