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Virtex-4 LX/SX Prototype Platform www.xilinx.com 13
UG078 (v1.2) May 24, 2006
Detailed Description
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4. JTAG Chain
Jumper J17 provides the ability to have the Virtex-4 in the JTAG chain or remove it from the
JTAG chain.
Note:
The Virtex-4 device must not be in the socket when detecting the ISPROM in the chain.
5. JTAG Termination Jumper
The DUT TDO pin can be jumpered to the TDO TERM pin or the downstream TDO pin.
When another board is connected to the downstream System ACE connector or
downstream interface connector, jumper the DUT TDO pin to the downstream TDO pin
for serial chaining. The connection allows the DUT TDO pin to be connected to the next
device in the chain.
The TCK and TMS pins are parallel feedthrough connections from the upstream
System ACE interface connector to the downstream System ACE interface connector and
drive the TCK and TMS pins of the onboard PROM and the DUT.
Note:
The termination jumper must be in place on the last board in the chain to connect the TDO pin
of the final device to the TDO feedback chain.