Virtual JTAG: "Hub IP" register value?

[Altera_Forum]

Hello. 

 According to the virtual JTAG Megafunction guide the "Hub IP configuration register" contains the following values:  Bits 7-0: SUM(m,n) Bits 18-8: ALTERA_MFG_ID = 0×6E Bits 26-19: N Bits 31-27: version  However in my tests (using Quartus II 11.0 and the Cyclone II evaluation board) Bits 7-0 seem to contain the number "m" only, not "m+n".  In the current project the virtual IR register (User1) is 13 bytes long (n=3, m=10) and bits 7-0 of the configuration register contain the number 10, not 13 as expected. I also tried (n=1, m=4) and (n=1, m=5); the configuration register values were 4 and 5, not 5 and 6 as expected.  Is this - A bug in the virtual JTAG Hub or - a bug in the documentation or - do I do anything wrong??  Thanks.  Martin

[Altera_Forum]

--- Quote Start ---   However in my tests (using Quartus II 11.0 and the Cyclone II evaluation board) Bits 7-0 seem to contain the number "m" only, not "m+n".   --- Quote End ---    The documentation is wrong. Here's my analysis  http://www.ovro.caltech.edu/~dwh/correlator/pdf/vjtag.pdf  Cheers, Dave

[Altera_Forum]

Hey Dave, 

I have been struggling issuing the VIR HUB_INFO instruction and then shifting out the resulting data. How to target the SLD_hub in that case?   Thanks.

[Altera_Forum]

--- Quote Start ---   I have been struggling issuing the VIR HUB_INFO instruction and then shifting out the resulting data. How to target the SLD_hub in that case?   --- Quote End ---    Download the zip file for this tutorial:  http://www.alterawiki.com/wiki/using_the_usb-blaster_as_an_sopc/qsys_avalon-mm_master_tutorial  There's a Tcl script in there for use with Quartus stp. It has all the hub interrogation code, eg., print_hub_info and print_node_info. Read that code, it'll show you how it all works.  Cheers, Dave

[Altera_Forum]

Hats off to you Sir, That bit of information was what I was missing in my logic

[Altera_Forum]

--- Quote Start ---  Hats off to you Sir, That bit of information was what I was missing in my logic  --- Quote End ---    You're welcome!  Cheers, Dave