Answers Database
EZTAG: Causes of Program and Erase problems
Record #1082
Product Family: Hardware
Product Line: Other
Product Part: EZTag Cable
Problem Title:
EZTAG: Causes of Program and Erase problems
Problem Description:
Below is a checklist of possible causes of problems with programming
and erasing 9500 devices with the EZTAG cable.
Solution 1:
1. Check the JTAG connections.
-TCK should be connected to system TCK
-TDI should be connected to system TDI
-TDO should be connected to system TDO
-TMS should be connected to system TMS
2. Vcc and GND must be connected to the cable.
3. Parallel port problems.
Certain implementations of the parallel port are not
correctly backward compatible with the old PC AT
"standard." A few that we have seen to exhibit the
problem are Gateways, Compaqs, and with SMC or Winbond
parallel port drivers.
The fix in this case is to try another PC, or go out and
buy an inexpensive parallel port card. These simpler
parallel port cards tend to be the AT types that work
best for the programmer.
4. If there are parts in the programming chain that are not
xc9500 parts, the problem may be due to a bug in the
software.
Download the patch from the FTP site, called EZTAG_PC.ZIP
(Xilinx File ftp://ftp.xilinx.com/pub/swhelp/cpld/eztag_pc.zip )
5. If the problem is with erasing, and suggestions 1-4 do
not help, repeat the erase 8 times. If the device
suddenly erases successfully, then try to program and
verify it. If this works, the part is okay.
If it still won't program or erase, it may be a
defective part.
End of Record #1082 - Last Modified: 01/22/97 15:29 |
