Am 09.11.2016 um 21:10 schrieb Grazvydas Ignotas notasas@gmail.com:
Hi,
On Wed, Nov 9, 2016 at 9:20 PM, Michael Mrozek EvilDragon@openpandora.org wrote:
Am Wed, 9 Nov 2016 18:43:16 +0100 hat "H. Nikolaus Schaller" hns@goldelico.com geschrieben:
Okay!
Here are the first results:
- Palmas A33 (SMPS3 feedback) *is* cut open in the new boards
Good!
For me it's a disappointment as I thought that change could have been missed by the confusion of the board production being stopped.
Me too.
I've noticed one thing in swps051k: the 8.1.2.3 "Device Naming Convention" chapter states that there can be a part number with "Device Speed" "0" which means "Nominal speed grade (Max MPU OPP = OPP_NOM)" instead of "High speed grade (Max MPU OPP = OPP_HIGH)". OPP_NOM is 1GHz and OPP_HIGH is 1.5GHz, this effectively means some OMAP5s don't support 1.5GHz.
I remember that we already discussed this a while ago.
Which part number do we have?
Hm. Very good question!
Here is a photo of the chip we have got in the newest production run:
Maybe we can read the speed from it?
BTW, here you can see the battery of decoupling capacitors around the OMAP. There are much less, but you also see that there are signal traces directly near them so adding more of them becomes difficult. And doing it exactly as recommended (individual VIAs for every capacitor) is impossible. The 3 copper layers below the surface layer are for connecting the DRAM chips and there are also constraints how to route them. So we mix two set of design rules in this area.
The OMAP5430 would have made life much easier in this aspect - but buying RAM chips for it would have been a nightmare.
BR, Nikolaus
