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Altera_Forum
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15 years ago

Cyclone III JTAG and AS Configuration

Problem: I am receiving the conf_done pin failed to go high error when trying to program using the JTAG interface. Background: I have configured a custom board to use both AS and JTAG confi...
Altera_Forum's avatar
Altera_Forum
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15 years ago

Thank you FvM. I disconnected pin 6 of the JTAG connector and was able to successfully program.

I got confused when reading note 3 on Figure 9-29 from the Cyclone III Configuration Guidebook.

Quoted Text in Red

(3) Pin 6 of the header is a VIO reference voltage for the MasterBlaster output driver. VIO must match the VCCA of the device. For this value, refer to the MasterBlaster Serial/USB Communications Cable User Guide. In ByteBlasterMV, this pin is a no connect. In USB-Blaster and ByteBlaster II, this pin is connected to nCE when it is used for AS programming, otherwise it is a no connect.

Since I am using a USB-Blaster and wanted AS support on my board I thought that the last sentence of the note was applicable and connected nCE to pin 6.

Does that note apply if I was going to use the JTAG port to program the EPCS device using the Serial Flash Loader?

Thank you again for your assistance!