Acorn IC die shots

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flynnjs
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Acorn IC die shots

Postby flynnjs » Fri Jun 09, 2017 7:42 am

At the Cambridge meetup, I took these snaps of some wafers that were in a box at the centre.
They are of Acorn heritage but we weren't sure what they might be. Any ideas?

IMG_0854.JPG

IMG_0855.JPG

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BigEd
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Re: Acorn IC die shots

Postby BigEd » Mon Jun 19, 2017 10:21 am

No idea really.

The top one is marked TX121 and has 27 pads. Some serious fraction of it is regular stuff - maybe a RAM, or a ROM. Could it be a cache chip? Or a video chip with a colour lookup table? It's not a processor, I think.

The second one has loads of interior minipads and miniminipads. Possibly a test chip - or maybe some kind of mixed-signal semi-custom chip??

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flynnjs
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Re: Acorn IC die shots

Postby flynnjs » Mon Jun 19, 2017 4:18 pm

I had assumed that the bottom one was possibly a ULA of some type.
The other I thought was very processor like or possible processor support IC.

They were in the tray with a ceramic quad flat pack with "Engineering Sample"
written on the top. This engineering sample was the same size and had the
same part code as the CPU in the ARM evaluation copro on display. Draw
your own conclusions... but we were quietly excited.

Of course we immediately compared the photo of the wafer with the pictures
in the ARM display cabinets in case we had a wafer of first generation ARM
samples but that was a leap too far...

So I'm left wondering if this could be ANNA, ARABELLA or ALBION, but I'm
not a 32bit man and this is the wrong board.

dp11
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Re: Acorn IC die shots

Postby dp11 » Mon Jun 19, 2017 4:26 pm

The top one doesn't really have enough pads to be anything from the Archimedes I don't think.

I was wondering about any of the Master ULAs

The ram section might only be five or 9 bits wide or five or 9 registers deep.

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flynnjs
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Re: Acorn IC die shots

Postby flynnjs » Mon Jun 19, 2017 4:35 pm

dp11 wrote:The top one doesn't really have enough pads to be anything from the Archimedes I don't think.


I guess, as Ed said, only 27 pads. Seems quite high density and too irregular to be a ULA.
Did Master/Compacts every have anything full ASIC?


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