Electronics > Beginners
Chip making process
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coppice:

--- Quote from: Wimberleytech on January 29, 2019, 08:03:22 pm ---

--- Quote ---...The cost of masks, and the time to requalify, is a huge deterrent to fixing things right now.

--- End quote ---

Spare gates!   ;)

Requal still needed though.

--- End quote ---
Everyone adds spare gates these days, and they do reduce the number of ALRs considerably. They are seldom able to fix more than simple logic errors, though.
Wimberleytech:

--- Quote from: coppice on January 29, 2019, 08:54:07 pm ---
--- Quote from: Wimberleytech on January 29, 2019, 08:03:22 pm ---

--- Quote ---...The cost of masks, and the time to requalify, is a huge deterrent to fixing things right now.

--- End quote ---

Spare gates!   ;)

Requal still needed though.

--- End quote ---
Everyone adds spare gates these days, and they do reduce the number of ALRs considerably. They are seldom able to fix more than simple logic errors, though.

--- End quote ---

Yes, indeed.
Spare analog can save an ALR from time to time as well.
Another useful feature is spare metal runs...wonder why???
coppice:

--- Quote from: Wimberleytech on January 29, 2019, 09:06:29 pm ---
--- Quote from: coppice on January 29, 2019, 08:54:07 pm ---
--- Quote from: Wimberleytech on January 29, 2019, 08:03:22 pm ---

--- Quote ---...The cost of masks, and the time to requalify, is a huge deterrent to fixing things right now.

--- End quote ---

Spare gates!   ;)

Requal still needed though.

--- End quote ---
Everyone adds spare gates these days, and they do reduce the number of ALRs considerably. They are seldom able to fix more than simple logic errors, though.

--- End quote ---

Yes, indeed.
Spare analog can save an ALR from time to time as well.
Another useful feature is spare metal runs...wonder why???

--- End quote ---
I wonder what the overall ratio of metal fixes to ALRs is, across the semiconductor industry?

These days even a single layer fix is getting so expensive, it can be hard to get managers to commit to them.
Wimberleytech:

--- Quote from: coppice on January 29, 2019, 09:10:20 pm ---
--- Quote from: Wimberleytech on January 29, 2019, 09:06:29 pm ---
--- Quote from: coppice on January 29, 2019, 08:54:07 pm ---
--- Quote from: Wimberleytech on January 29, 2019, 08:03:22 pm ---

--- Quote ---...The cost of masks, and the time to requalify, is a huge deterrent to fixing things right now.

--- End quote ---

Spare gates!   ;)

Requal still needed though.

--- End quote ---
Everyone adds spare gates these days, and they do reduce the number of ALRs considerably. They are seldom able to fix more than simple logic errors, though.

--- End quote ---

Yes, indeed.
Spare analog can save an ALR from time to time as well.
Another useful feature is spare metal runs...wonder why???

--- End quote ---
I wonder what the overall ratio of metal fixes to ALRs is, across the semiconductor industry?

These days even a single layer fix is getting so expensive, it can be hard to get managers to commit to them.

--- End quote ---
Good question.  My last node was 180nm, so I have been out of the industry for awhile.
At my last company (which I started), I dont think we ever did an ALR--maybe one.  That was out of about a dozen base platforms.  Tools are just so good, and with a solid methodology, you can get it mostly right (tweak with metal fix) every time.  Now, doing RF or extreme precision...perhaps another story.
coppice:

--- Quote from: Wimberleytech on January 29, 2019, 09:19:15 pm ---
--- Quote from: coppice on January 29, 2019, 09:10:20 pm ---I wonder what the overall ratio of metal fixes to ALRs is, across the semiconductor industry?

These days even a single layer fix is getting so expensive, it can be hard to get managers to commit to them.

--- End quote ---
Good question.  My last node was 180nm, so I have been out of the industry for awhile.
At my last company (which I started), I dont think we ever did an ALR--maybe one.  That was out of about a dozen base platforms.  Tools are just so good, and with a solid methodology, you can get it mostly right (tweak with metal fix) every time.  Now, doing RF or extreme precision...perhaps another story.

--- End quote ---
When you find an obscure but important bug in something like the brownout module, or other hybrid analogue/digital part, of something like an MCU, it usually isn't fixable by metal changes, and by the time you find it there might be several mask sets with that issue. Fun times for ALR bills. :)
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