[Open-graphics] OGA1 mad dash: What's left

[Viktor Pracht]

Timothy Normand Miller wrote:

> So we have a 1GiB address space that is [29:0].  For 32-bit words,
> that's [29:2] or [27:0].  For 64-bit, that's [29:4] or [25:0].

We drop only one bit when going from 32 to 64. It's [29:3], not [29:4].

Why are all buses of the form [high-low:0]? Can't we use [high:low] throughout? I think it would make this stuff a lot easier and therefore less error-prone. E. g. you wouldn't wonder whether the XP10 already dropped two bits, you would see it in the port definitions.


- Viktor Pracht
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