USB Blaster replace/repair

from ALtera support "FIND ANSWERS"

Problem

Are there any known errors in the Stratix and Cyclone Configuration chapters

with reference to the external pull-down resistor value recommended for the

JTAG TCK signal?

Solution

Yes. The JTAG TCK pull-down resistor value is incorrectly specified as

10k-ohms in the Stratix and Cyclone Configuration chapters. The correct

external pull-down resistor value is 1k-ohm. This stronger resistor ensures

that the TCK signal is biased at a logic low level despite the weak internal

pull-up on this pin. The internal pull-up ranges from 20k-ohms to

40k-ohms across process, voltage and temperature.

Future versions of the Stratix and Cyclone Handbooks will be updated accordingly.