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Altera_Forum
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16 years ago

External JTAG port on DK-DSP-3C120 - EthernetBlaster

Hi All, Has anyone used the external JTAG port on the Cyclone III dev kit? I've tried an EthernetBlaster and USB-Blaster using Number 4 in Table 2-7 of the CIII Dev kit Reference Manual (i.e....
Altera_Forum's avatar
Altera_Forum
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16 years ago

Although I haven't tried that particular dev kit, I know from various other boards and dev kits that I have worked with is the USB blaster may have issues if there are reflections on the TCK line.

For improved reliability we've modified our USB blasters by replacing the 10 ohm source termination resistor with a 22 ohm resistor. So far it's helped in all cases where we had issues, and hasn't hindered in any case where we did not have any issue previously to the modification.

Pete