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Altera_Forum
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15 years ago

EP2 won't AS configure, nCONFIG stuck lo

EP2C5Q208 will not AS configure itself. Circuit is exactly as Fig. 13-7, page 13-20 in Cyclone2 Device Handbook, Vol. 1 for a single device. Configuration device is EPCS4. (Using USB Blaster Quart...
Altera_Forum's avatar
Altera_Forum
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15 years ago

For the device ID, in JTAG mode, when you have no .sof loaded, you should be able to do a "Auto Detect" like you assumed, and should added the EP2C5 device to the list.

IE delete the EP2C5 from the list, so you have just a empty screen, then hit the auto detect, and it will find the EP2C5 but not have a .SOF associated with it. If this works, then at least the device is alive. If not, check to make sure the TDI/TDO pins aren't swapped. Also noise or poor termination may be present on TCLK causing issues.

Since you have the MSEL's set for AS, you should be able to probe the clock, CS and data pins on the configuration device and see activity. If you see no activity, it's not trying. I believe nCONFIG must be high to work, so you may try to add a stronger pull-up to VCCIO to determine if you can force activity on the configuration pins.

Pete