DO-CPLD-DK-J-G Xilinx Inc, DO-CPLD-DK-J-G Datasheet - Page 9

• Manufacturer Part Number: DO-CPLD-DK-J-G
• Description: KIT STARTER CPLD JAPANESE
• Manufacturer: Xilinx Inc
• Series: CoolRunner™- IIr
• Type: CPLD Development Kitr

Specifications of DO-CPLD-DK-J-G

• Contents: Proto Board, Download Cable, Software and Documentation
• For Use With/related Products: CoolRunner-ll, XC9500XL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CPLD I/O User Guide
Terminations
CPLD I/O User Guide
UG445 (v1.1) November 27, 2007
Termination Options
R
Terminations are a vital aspect of a robust transmission line. The on-chip termination of
the CPLD I/Os eliminate the need for external termination. It is strongly recommended
not to float CMOS inputs as this increases power. The on-chip termination of the CPLDs
can be used to minimize power without the need for external components. The following
section will discuss the termination options available in the different CPLD families and
how to utilize the features.
The user can select the termination type for the unused I/Os and the Input and Tristate
I/Os separately.
For the Input and Tristate I/O termination mode, the options are (default in parentheses):
Note:
•
•
•
For the Unused I/Os, the options are (default in parentheses):
•
•
•
For CoolRunner-II devices, it is possible to have a combination of multiple termination
modes for used and unused I/Os. However, not all combinations are possible. Below are
the permitted combinations:
Table 1: Input Termination Schemes
All Pull-up
All Bus-hold
Combination of Pull-up and Float
Combination of Bus-hold and Float
All Float
XC9500 XL/ XV: Float, Keeper (keeper)
CoolRunner™ XPLA3: Float, Pull-up (pull-up)
CoolRunner-II: Float, Pull-up, Keeper (Keeper)
XC9500 /XL/XV: Float, Ground (float)
CoolRunner XPLA3: Float, Pull-up (pull-up)
CoolRunner-II: Float, Ground, Pull-up, Keeper (ground)
Possible Input Termination Schemes
Bus-hold and Keeper terms can be used interchangeably.
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