Altera USB-Blaster II - Manual (Page 17)

Chapter 2: USB-Blaster II Download Cable Specifications 2–7
Changing the TCK Frequency
October 2014 Altera Corporation USB-Blaster II Download Cable
User Guide
Changing the TCK Frequency
The USB-Blaster II download cable has a default TCK frequency of 24 MHz. Where
signal integrity and timing prevents operating at 24 MHz, change the TCK frequency of
the USB-Blaster II:
1. Open the command line interface with the Quartus II bin directory in your path
(for example, C:\altera\14.0\quartus\bin64).
2. Type the following command to change the TCK frequency:
jtagconfig --setparam <cable number> JtagClock <frequency><unit prefix>
Where:
■ <cable number> is the USB-Blaster II cable to be modified.
■ <frequency> is the desired TCK frequency. Use one the following supported
rates:
■ 24 MHz
■ 16 MHz
■ 6 MHz
■ 24/n MHz (between 10 kHz and 6 MHz, where n represents an integer
value number)
■ <unit prefix> is the unit prefix for the frequency (e.g., M for MHz).
Example for setting TCK maximum frequency to 6 MHz:
jtagconfig --setparam 1 JtagClock 6M