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Altera_Forum's avatar
Altera_Forum
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12 years ago

JTAG Configuration - conf_done pin always low, even pull-up

After Board power-on, the conf_done pin which is also 10k pulled-up to 3.2V, but the pin is stick to low. the pull-up is not working for this pin. No short to GND. After power-on device, 16...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

1. spec says msel should be gnd(0000) for JTAG Configurtion. it looks fine.

2. Doubt the BGA soldering on conf_done pin. because pull-up itself is not working.

3. Total 70 Devices are detected included the last EP3C25F device as shown.

Checked the configurations on pull-up/down with device(3.3V IO) and USB Blaster (3.3V Power) and VCCA, VCCINT, VCCIO.

all looks folow the spec. Determining the resodering the Device. Any suggestions ?