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*Obsolete* JTAG - How to attach a pullup or pulldown resistor on the 4K TDO pin?
Keywords: xc4000, xc4000e, xc4000x, xc4000xl, xde, epic, pullup, pulldown, tdo, makebits, BitGen
How to access the pullup or pulldown in the TDO IOB in a XC4000 series device if the TDO pin is being used as an output or OBUFT?
1 It is possible to attach the pullup or pulldown to the TDO pin using MAKEBITS in the XACT 5.x, 6.x software.
Run makebits with the following option:
makebits -f TdoPin: Pullup | Pulldown <lca file>
NOTE: It is not possible to access this feature via XDE. You can only see the TDO component, however you cannot edit it.
2 It is possible to attach the pullup or pulldown to the TDO pin using BitGen in the M1 software.
Run BitGen with the following option:
bitgen -g TdoPin:Pullnone | Pullup | Pulldown <infile[.ncd]>
NOTE: It is not possible to access this feature via EPIC. You can only see the TDO component, however you cannot edit it.
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