Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Highlighted
Honored Contributor I
850 Views

SomeQuestions about the virtual jtag TCK

I tried to send a 800*480 image throw the vjtag,here is the tcl: 

puts " Begin to read..." set run_width 0 set run_height $height # puts device_unlock set pix_array(,$run_width) $pixel incr run_width # puts "The pixel is $pixel" } incr run_height -1 set run_width 0 puts "Line.......$run_height" } 

but the time to send all the data is so long,about 20min,during the process I use the oscilloscope to measure the TCK pin of the usbblaster,it is about 200kHz,the Virtual jtag megafuntion handbook noted: 

Note that TCK (a maximum 10-MHz clock, if using an Altera programming cable) provides the clock for the entire SLD infrastructure.  

And the usbblaster ii download cable user guide:The USB-Blaster II download cable has a default TCK frequency of 24 MHz. 

I catch the waves throw the signaltap, 

http://www.alteraforum.com/forum/attachment.php?attachmentid=12802&stc=1 the shiftting takes about 96 Ttck when translatting the 24 bits data,even though,the image has 800*480 = 384000 24bit datas, 384000*96 = 36864000,when the tck is 200kHz,it should takes about 36864000/200000 = 184s,about 3min, 

I don't know why the transmission is so slow,does anyone can help me?
0 Kudos
2 Replies
Highlighted
Honored Contributor I
8 Views

I tried to send a 800*480 image throw the vjtag,here is the tcl: 

puts " Begin to read..." set run_width 0 set run_height $height # puts device_unlock set pix_array(,$run_width) $pixel incr run_width # puts "The pixel is $pixel" } incr run_height -1 set run_width 0 puts "Line.......$run_height" }  

 

but the time to send all the data is so long,about 20min,during the process I use the oscilloscope to measure the TCK pin of the usbblaster,it is about 200kHz,the Virtual jtag megafuntion handbook noted: 

Note that TCK (a maximum 10-MHz clock, if using an Altera programming cable) provides the clock for the entire SLD infrastructure.  

And the usbblaster ii download cable user guide:The USB-Blaster II download cable has a default TCK frequency of 24 MHz. 

I catch the waves throw the signaltaphttps://www.alteraforum.com/forum/attachment.php?attachmentid=12809 , 

the shiftting takes about 96 Ttck when translatting the 24 bits data,even though,the image has 800*480 = 384000 24bit datas, 384000*96 = 36864000,when the tck is 200kHz,it should takes about 36864000/200000 = 184s,about 3min, 

I don't know why the transmission is so slow,does anyone can help me?
0 Kudos
Highlighted
Honored Contributor I
8 Views

https://www.alteraforum.com/forum/attachment.php?attachmentid=12810 I am a beginner of this forum,the image in the thread is fuzzy,so i upload a new image

0 Kudos