--- Quote Start ---
I own the Stratix V GX development board, and I want to reconfigure the tranceiver clocks. I must read/write registers of Si570 device through the MAX II CPLD.
Could someone tell me how to communicate over the JTAG to the MAX II?
With FPGA, I can do it with Tcl command in System Console if I put "JTAG to Avalon Master Bridge" in Qsys, but the Qsys system of the CPLD has a Virtual JTAG component (with I2C component) instead.
--- Quote End ---
Is their use of the Virtual JTAG interface documented?
In the zip file for this tutorial:
http://www.alterawiki.com/wiki/using_the_usb-blaster_as_an_sopc/qsys_avalon-mm_master_tutorial Is a set of Tcl commands for quartus_stp. The commands can be used to list the configuration of the Virtual JTAG interface on the MAX II. From that, you should be able to issue the commands necessary to change the clock.
Cheers,
Dave
Honored Contributor
