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Altera_Forum
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16 years ago

Cannot detect device with own JTAG cable

Hello, I have just placed a MAXII on a custom board and am trying to program it with a ByteBlaster cable made following the usual schematics online. The programmer reports: Error: ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi FvM thanks for your reply,

I've checked the board and TMS isn't shorted. I am about to check the cable and wondered what is the worst case scenario of making a cable without the 74HC244 - i.e. just straight through?

EDIT UPDATE: Right I checked the JTAG Cable and 1. it is sending the TMS signal and 2. It seems to be getting 3.3v out of thin air for the power supply for the 74HC244 which is meant to be off the board (which wasnt connected)

Ive also found a broken track on the PCB on the TMS line and am patching that right now.