Am Fr 25. April 2008 schrieb Werner Almesberger: > [EMAIL PROTECTED] wrote: > > The idea is *every* GPIO is I *and* O, so you have maximum flexibility. > > Our layout girls are probably busy making "Joerg" voodoo dolls right > now ;-)
She's sitting next booth to me, so far I didn't notice any black magic. Well even schematics not started yet, let's wait for the PCB-routing... ;-) > > I'd say that we should consider GTA04v1 (v0 ? ;-) as a first test > balloon, where we can do things that won't make sense in the final > product, if doing those things helps us to speed up development. > > This will also help us avoid endless haggling about some minor features > that may get overridden later by larger design decisions anyway. > > So I'd agree with the MPU being able to do more than strictly needed. > Then, as development continues, we'll gradually get a better idea of > what we really need and what not, and then we can always decide to > remove some connections Remove connections? Never! Maybe remove a whole layer, so it's worth it, but some connections... :-/ > or even to pick a less powerful and cheaper > chip. Yep. > > By the way, "help to speed up development" should also go for our > hardware team. If any of this sounds unreasonable for you, please don't > hesitate to raise your concerns. > > It wouldn't do us any good to design a software engineer's wet dream > platform where all the system software can be easily done in half a > day, but where we need a 50-layer board and dozens of prototype runs > to get the hardware working ;-) > > > BTW: which number of LED is GTA04 > > I don't think we know yet. I think Steve hates them a bit. I'd like > to have at least one "engineering LED" for debugging, but it doesn't > have to be visible when the case is closed :-) We have to plan for _some_ maximum. 64? 256? Drop some of them later no problem. This is our core-design! cheers jOERG
