In the Beginning u said Decompressor have a LFSR .but when you come to lock up latches both are reverse as you given by video wrong. first Decompressor will come. after that scan chain out will connect to the compressor logic,and you mentioned timing violation between Decompressor to scan chain,that y you given lock up latch.can you please explain the timing violation s in detail and LFSR inside the logic having flipflop and combo logic ( for this also we need explanation),can you please revise the video again.thanks for making video ,this one is really very help full.
I have doubt How is LFSR is deciding which pattern will go in which scan chain ?...also does it change the ATPG Patterns?...then what will be use of ATPG ?
1. so the compressor/ decompressor used edt_clock and scan chains use different scan clock which might cause skew with timing violation. so we induce lockup latches when there is timing violation. 2. Two different adjacent flip-flops might use two different clocks. ex. clock of launching flop may be scan clock directly clock of capturing flop might be derived from scan_clock. so there might be skew causing timing violation. so we induce lockup latch when there violation.
This vdo while explaining the lockup latch you mistaken.. Instead of compressor you are saying it as decompressor at that time you figure is also wrong.. Its actually not decompressor its a compressor
Good knowledgeable video on EDT.
Thanks for the video
very detailed video thanks. Looking forward to more videos.
Good explanation sir. Thank you.
LFSR exists in decompressor u changed the blocks but thanks for information and why we need edt clock and edt update in compressor?
In the Beginning u said Decompressor have a LFSR .but when you come to lock up latches both are reverse as you given by video wrong. first Decompressor will come. after that scan chain out will connect to the compressor logic,and you mentioned timing violation between Decompressor to scan chain,that y you given lock up latch.can you please explain the timing violation s in detail and LFSR inside the logic having flipflop and combo logic ( for this also we need explanation),can you please revise the video again.thanks for making video ,this one is really very help full.
Good presentation👍
In this video i didn't understand what is the difference between 1 hot masking and how to detect fault aliasing patterns with mask patterns??
I have doubt
How is LFSR is deciding which pattern will go in which scan chain ?...also does it change the ATPG Patterns?...then what will be use of ATPG ?
In the beginning u said decompressor will be having the lfsr logic, at the time of lock up latch u said compressor will be having lfsr logic.
only de-compressor will have LFSR logic.
1 hot masking and fault alising both are same right ?
I didnt understand why lockup latches are induced between scan chains and compactor and between two cells in scan chains
1. so the compressor/ decompressor used edt_clock and scan chains use different scan clock which might cause skew with timing violation. so we induce lockup latches when there is timing violation.
2. Two different adjacent flip-flops might use two different clocks.
ex. clock of launching flop may be scan clock directly
clock of capturing flop might be derived from scan_clock.
so there might be skew causing timing violation. so we induce lockup latch when there violation.
How we deal combinational logic with edt
Thank you ❤️
This vdo while explaining the lockup latch you mistaken.. Instead of compressor you are saying it as decompressor at that time you figure is also wrong.. Its actually not decompressor its a compressor
Is there any specific port for edt_clk while using EDT
can you please conform
yes edt_clk is there for EDT
why edt_update signal is used to reset the decompression and compression whenever the new patterns are loaded
because to erase previous values stored inside them.