IDE, Serial Loader programming problems

[Altera_Forum]

We are using this board: 

Custom board with EP2C8 device and EPCS16 serial loader Micron 16 meg SDRAM VGA output with custom verilog controller which uses SDRAM for VRAM EPCS controller, JTAG uart, system ID, timer, etc.  We made up a complete system for it and programmed it successfully. Then we loaded that system into the serial loader. VGA comes up with random SDRAM data for pixels.  1) We tried making a Nios II IDE project for our working system. Compiled fine, and upon running it gave us this error: Using cable "USB-Blaster [USB-0]", device 1, instance 0x00 Pausing target processor: not responding. Resetting and trying again: FAILED Leaving target processor paused  2) We read this post on the forum describing a similar problem (http://forum.niosforum.com/forum/index.php?showtopic=3283), and it suggested that their DDR core was the culprit. We tried creating a new project without it (and consequently without the VGA controller), and found upon normal JTAG programming that the system was left unchanged (i.e. VGA turns on). I didn't actually try running hello world on the system without the SDRAM, because we figured it was unchanged. I might try that as my next step.   3) We then assumed that the cause of problem# 2 was that it was being reprogrammed with the prior system in our serial loader. We tried erasing and reprogramming the serial loader, and we get this error in quartus:  Error: Flash Loader IP not loaded on device 1 Error: Unexpected error in JTAG server -- error code 44 Error: Operation failed  In summary, we can't run code on our system, we can't change our system because it's defaulting to the serial loader contents, and we can't erase the serial loader.

[Altera_Forum]

Hi Rhaik, 

 are you using serial resistors on your jtag signals? We had to add 47 Ohm serial resistors to the jtag signals on one of our custom boards in order to get the jtag interface to work properly.   --wolfgang

[Altera_Forum]

--- Quote Start ---  originally posted by pfab@Feb 20 2006, 01:39 AM hi rhaik,  are you using serial resistors on your jtag signals? we had to add 47 ohm serial resistors to the jtag signals on one of our custom boards in order to get the jtag interface to work properly.   --wolfgang <div align='right'><{post_snapback}> (index.php?act=findpost&pid=12816)  --- quote end ---    --- Quote End ---    Well, we tested this with the ByteBlaster II, which has slower JTAG signals than the USB Blaster, and it worked. We therefore think that we have some speed issues with the JTAG, and the hardware guy thinks we might be able to fix it by adding caps.  Anyway, so now that our JTAG works OK, we narrowed down the cause of the running code problem.  Our SDRAM isn&#39;t working right. I&#39;m going to take the discussion over to this thread (http://forum.niosforum.com/forum/index.php?showtopic=3283).