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Vlasta
Joined: 15 May 2012
Posts: 2565
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 Posted: Thu Apr 03, 2014 6:11 pm Post subject: IDT 79440 |
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HI - anyone got any ideas what this device is - CPU or what?
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best rgds.
Steve |
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aberco
Joined: 05 Sep 2013
Posts: 2655
Location: Paris France
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| Posted: Thu Apr 03, 2014 6:55 pm Post subject: |
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| MIPS R4400, shrinked die, very nice! |
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Guest
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| Posted: Thu Apr 03, 2014 7:36 pm Post subject: |
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| aberco wrote: | | MIPS R4400, shrinked die, very nice! |
I have one that I broke yesterday - you can have a bit of it for a die shot if you like? |
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Vlasta
Joined: 15 May 2012
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| Posted: Thu Apr 03, 2014 7:38 pm Post subject: |
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I have one that I broke yesterday - you can have a bit of it for a die shot if you like?
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Steve |
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aberco
Joined: 05 Sep 2013
Posts: 2655
Location: Paris France
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| Posted: Thu Apr 03, 2014 7:56 pm Post subject: |
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| Would love to. My photo equipment is not ready yet, you could send it to Birdman too as I'm not sure if he has the shrinked version of R4400 yet. |
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Vlasta
Joined: 15 May 2012
Posts: 2565
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| Posted: Thu Apr 03, 2014 7:58 pm Post subject: |
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OK - PM me with both of your addresses and I will send off a bit each - I also have some other broken wafer prices too that I will send when I get time.
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Steve |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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Vlasta
Joined: 15 May 2012
Posts: 2565
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| Posted: Thu Apr 03, 2014 9:39 pm Post subject: |
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The trip card for this wafer is marked as 79v44077A-01
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Steve |
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Guest
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| Posted: Thu Apr 03, 2014 11:54 pm Post subject: |
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| And the dies shot is exactly an R4400 so I think Aberco is correct on this. |
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CPUShack
Joined: 16 Jun 2003
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aberco
Joined: 05 Sep 2013
Posts: 2655
Location: Paris France
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| Posted: Fri Apr 04, 2014 5:43 am Post subject: |
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Look that yours is even more shrinked than this one
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Birdman.
Joined: 13 Nov 2012
Posts: 833
Location: Finland
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| Posted: Fri Apr 04, 2014 7:19 am Post subject: |
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| Yes, that's the smallest and likely latest R4400 die version I've seen so far. I have an early NEC chip waiting at AVICC in addition to the later shrinked NEC I've already photographed, so comparing this version to them will be interesting. I'm wondering how fast this shrinked core could run compared to larger versions. |
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aberco
Joined: 05 Sep 2013
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Location: Paris France
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| Posted: Fri Apr 04, 2014 7:33 am Post subject: |
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| R4400 went up to 250MHz, but most common are NEC and Toshiba parts. IDT R4400 are rather rare (they concentrated on the R4600). |
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Vlasta
Joined: 15 May 2012
Posts: 2565
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| Posted: Thu Apr 10, 2014 3:52 am Post subject: |
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I found this on the die and also a nice little Daffy Duck head which I cannot get a clear shot of  - This seals this die as MIPS R4400 for sure....
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