[libre-riscv-dev] [Libre-silicon-devel] [OT only slightly] STEAM Camp OpenSourceEcology 22jan2020 for 9 days

[Jacob Lifshay]

Related youtube video: https://youtu.be/XrEC2LGGXn0

On Tue, Dec 31, 2019, 05:15 David Lanzendörfer <leviathan at libresilicon.com>
wrote:

> Hi Pavel
>
> One one micron mask set can cost between two thousand US dollar and
> upwards (depending on the amount of layers), but this cost will increase
> drastically as soon as you go below one micron.
>
> Additionally there are multiple draw backs about mask sets which could
> be eliminated when using a mask less lithography system.
>
> For instance, you only can expose one pattern using a stepper, and even if
> you only have a hand full of prototypes to manufacture, you will still end
> up paying the costs for the mask sets, even if you do only one single
> wafer.
>
> In addition the loading and unloading of the masks into the stepper aligner
> is time consuming.
>
> Having a display just switch between layouts during exposure allows for an
> arbitrary amount of prototype chips without the need for manufacturing
> masks.
>
> This BTW also reduces another attack vector from Andrew (Bunnie) Huang,
> which he mentioned during his congress talk.
>
> Cheers
> -lev
>
> On Tuesday, 31 December 2019 8:38:25 PM HKT pavel at noa-labs.com wrote:
> > Are 1um masks that expensive (compared to the rest of setup)? Or is it
> has
> > more to do with turnaround times?
> >
> > Can you share details of a light source and resist? One important thing
> will
> > be to pick light source that will not burn the LCD matrix, and will not
> be
> > absorbed by the glass much. Making a custom made LCD with special
> materials
> > might not be that cheaper that sticking with masks for the beginning.
> >
> > It will be truly great if one can just replace the mask with LCD with no
> > extra work
>
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