GAL programming help

[Iggy_Drougge]

Does anyone here have experience programming GALs? I bought an NS GAL22V10-15 as a replacement for a Lattice GAL22V10-25. When I put it into my ALL-07 programmer, the first "blank check" works fine, but programming it with a JEDEC file fails miserably, and after that, the software just reports that manufacturer number doesn't match. Checking the GAL in another programmer gives no better results; after programing with the same JEDEC file, the verify fails and the GAL is just filled with 11111111111.

[Iggy_Drougge]

Yes, surely the NS devices would be the same? I'm sure I read that they had an EEPROM mask and could handle a hundred programming cycles.

I certainly haven't blown the fuses willingly (there is a command to do so, but I haven't heard that a JEDEC file can enforce it).

I have checked the buffer contents, they look good, and the checksum given by the software matches up.

The NS GAL22V10-15LNC are DIL packages, so I just put them with the notch in the direction indicated on the ZIF socket on both programmers.