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Preface
About This Guide
The CPLD I/O User Guide describes the behavior of the I/Os under various operating
conditions. It describes how to use the different termination modes, how to understand
thresholds, and how loading affects the I/Os.
Guide Contents
This manual contains the following topics:
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“Terminations” provides a brief description of the different terminations available in
Xilinx CPLDs. It also contains details on how to use termination.
“Thresholds” describes in detail the conditions that affect the threshold levels. It gives
examples on how to use the I/V curves to understand what thresholds are under
nominal operating conditions.
“Power, Sequencing, and Slew Rates” describes effects of powering, sequencing, and
slew rates on I/Os. It includes details on how much voltage can be driven into a
Xilinx CPLD and the behavior of the I/Os in different operating conditions.
Additional Resources
To find additional documentation, see the Xilinx Web site at:
www.xilinx.com/support/documentation/index.htm .
To search the Answer Database of silicon, software, and IP questions and answers, or to
create a technical support WebCase, see the Xilinx Support Web site at:
www.xilinx.com/support .
Additional Documentation
Xilinx ISE Software Manuals are available for download at:
www.xilinx.com/support/software_manuals.htm .
The following documents are also available:
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DS012 CoolRunner? XPLA3 CPLD Data Sheet
This data sheet contains the electrical and functional specifications of the CoolRunner
XPLA3 CPLD.
DS090 CoolRunner-II CPLD Family Data Sheet
This data sheet contains the electrical and functional specifications of the
CoolRunner-II CPLD.
CPLD I/O User Guide
UG445 (v1.2) January 14, 2014
www.xilinx.com
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