Invalid JTAG configuration

Description

Due to a problem in the Quartus® II software version 12.0 SP2 and earlier, you may see this error in SignalTap™ II Logic Analyzer when you use a USB-Blaster™ II cable with Arria® V devices.

Resolution

To work around this problem, perform the following steps after programming the SRAM Object File (.sof). Note that the jtagconfig executable can be found in <Quartus II software installation directory>/quartus/bin or <Quartus II software installation directory>/quartus/linux.

1. Open a Command prompt
2. Type the following command
   jtagconfig
3. Verify which cable number you are using
4. Type the following command:
   jtagconfig --setparam <cable number> JtagClock 16M
5. Verify the change by typing the following command:
   jtagconfig - -getparam <cable number> JtagClock

This issue has been fixed beginning with the Quartus II software version 12.1.