SCANSTA112 bypassed
The SCANSTA112 (IC29) is a JTAG multiplexer. It provides separate access to the JTAG port of the application FPGA, QDRII and GN4124. The JTAG master can be selected, by means of switch (SW1) to come either via the JTAG connector (J1) or from the GN4124.
See Configuration and JTAG chain diagram [pdf]
The SCANSTA112 can be bypassed by mounting:
R222, R234, R233, R223,
R159 ON, R166 should be OFF to put in tri-state the SCANSTA112 JTAG ports.
The default configuration will be SCANSTA112 not bypassed:
R222, R234, R233, R223 OFF
R159 OFF, R166 ON
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