Another USB blaster problem

Odds are that you have signal integrity issues, especially, if this is a custom board...

The fact that it works with a ByteBlaster II and not with the USB Blaster probably has to do with the speed at which data is traveling across the interface. The USB Blaster is quite a bit faster.

It's my opinion that a board's JTAG chain is not clean until I can debug CPUs and run Signaltap II sessions, simultaneously, from within each of the FPGAs in my chain.

There's help/advice available from the Altera website and this forum.

Good luck!

- slacker

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originally posted by svhb@Oct 21 2005, 01:36 AM

hello,

just arrived here, a usb blaster. install driver, upload fpga configuration data no problem.

then tried nios2-download to get the software into the system, but strange erro occurs.

then tried with byteblaster to get software into the system (like i did already for years). no problem.

here is the difference between the two :

usb blaster :

$ nios2-download safe.elf --cable 2 -g
using cable "usb-blaster ", device 1, instance 0x00
pausing target processor: ok
downloading 00100000 ( 2%)assertion "m_state == state_debug" failed: file "nios2
debug.cpp", line 1695
signal 6

and with byteblaster :

$ nios2-download safe.elf --cable 1 -g
using cable "byteblasterii ", device 1, instance 0x00
pausing target processor: not responding.
resetting and trying again: ok
downloaded 181kb in 4.4s (41.1kb/s)
verified ok
starting processor at address 0x00100000

any idea what to check?

stefaan

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