check the following configuration schemes:
- Ensure that JTAG support is correctly set in MAX PLUS II by performing
the following steps:
- Choose Global Project Device Options (Assign menu).
- Turn on the Enable JTAG Support option.
- Choose OK.
- Ensure that you have driven the correct JTAG pins at the correct logic
If your options and pin values are correctly set, your EPF8282 device may
have a faulty JTAG interface. The JTAG interface fails in 1% to 2% of EPF8282
devices with date codes earlier than x9512. Faulty JTAG registers will not
pass any data through the JTAG chain, but will remain low.
JTAG capability was not verified on EPF8282 devices with date codes earlier
than x9512, where x is any letter. The date code is marked on top of the
device. For example, a device manufactured during the 8th week of 1997 will
have the date code x9708. Any device with a date code later then x9512 is
screened for JTAG capability, verifying that the JTAG feature functions
You can exchange EPF8282 devices with date codes prior to x9512 that have a
faulty JTAG interface by calling Altera Customer Service at (408) 544-7104.