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Altera_Forum
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18 years ago

Cyclone III configuration

I'm about to spin my Cyclone 3 board and want to be sure I get the configuration stuff wired correctly. I'm using a JTAG connection to the USB Blaster and a Serial Config Device (active serial)...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

I'm about Cyclone III ep3c5e144.

JTAG lines behave strangely. I connected the JTAG pull-ups to VCCA which is 2.5 Volts. But they are equal to 0.

MSEL = 101 (to VCCA).

When I connect to ByteBlaster-MV (VCCA 2.5 V) I see signals at the inputs (TDI, TMC, TCK), but TDO is always 0!! So programmer can't see board ("Can't acces JTAG chain").

Everything was good with Cyclone, CII.

What I do not understand? What did I miss?

Thanks.