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AR# 1195

Xchecker Cable: What is the CCLK circuitry in the Xchecker cable?


When interfacing the xchecker cable to a custom PC board, it is sometimes important to know the CCLK circuitry.


The CCLK pin is driven by an IOB on the XC3042 inside XChecker.
It has the same sink/source characteristics as listed in the
3000 datasheets. The pin is terminated with 100 ohm, 100pF network as shown below:

| 100
|-------+------\/\/\/-----O CCLK to user's
XC3042 | | Board
| --- 100pF
-------- ---

AR# 1195
Date Created 08/31/2007
Last Updated 10/01/2008
Status Archive
Type General Article