Hardware User Guide
1-4 Xilinx Development System
• Works at multiple supply voltages (5 V, 3.3 V, and 2.5 V).
• Supports JTAG configuration for all Xilinx devices.
• Supports SelectMAP configuration mode for Virtex.
Previous Cable Versions
This section details considerations for using previous download
cables with the Hardware Debugger Software.
You can use Hardware Debugger software with all previous parallel
and serial download cables. However, these previous cables can only
be used to download a configuration bitstream, they cannot be used
for readback.
If you do use Hardware Debugger with a previous parallel or serial
download cable version, keep the following points in mind.
• Previous versions of the download cable were made to download
XC3000 and XC2000 designs, not XC4000 designs. The basic limi-
tation of the previous cables is that they do not have a PROG pin
to initiate a re-program in XC4000 devices. They also do not have
an INIT pin to check for Cyclical Redundancy Check (CRC)
errors during configuration.
Note To use a parallel download cable prior to the Parallel Cable
III to download designs to the XC4000 family devices, you must
manually toggle the PROG pin to low. PROG is active when it is
low. (The Parallel Cable III has a wire for the PROG pin.)
• Previous download cables do not support readback or verifica-
tion.
• For the PC, the download cable is a parallel cable, requiring
connection to the parallel port. (The XChecker cable is serial.)
There are only two situations when you might prefer using previous
download cables instead of the XChecker Cable or MultiLINX Cable.
• You have circuit boards with header connectors keyed to match
the previous cable headers. However, you could use the
XChecker Cable with its flying lead connectors. Simply match the
labeled flying leads to the equivalent signals on your system.
• You have circuit boards where power consumption is a critical
factor. (The XChecker Cable requires about 100 mA at 5 V and the
MultiLINX Cable requires about 300mA at 5 V, 500mA at 3.3 V,
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