Peter Jakacki wrote: »
I'm thinking of finalizing the board and getting it done before the next batch of P2 chips are available. Along with that I will have my dev board for it to plug into but I'm looking at what I like to have on that board and now HDMI looks possible too. I just realized I could add a PHY for Ethernet too.
rogloh wrote: »
That combination of a fan mounted below your dev board cutout and the heatsink jmg found might be a decent combination if you plan to overclock etc.
Peter Jakacki wrote: »
BTW, Chip wanted the 1.8V available externally but I'm reluctant to make this accessible normally since we don't want to power external devices that could compromise the P2 itself and besides it is easy enough to use another 1.8V regulator. So I think the pinout should remain the same and the 3.3V pins are available for external devices. I may end up using a switcher for the 3.3V rail on the P2D2 along with an option of a 3.3V LDO that could optionally split the VIO as we do now.
Cluso99 wrote: »
I'll get to try a few things this afternoon just to get comfortable with P2. Then I can get on to testing the booting resistors and SD.
If you are around I'll give you a buz and we can try a few of your TAQOZ things out
msrobots wrote: »
you know of my love and hate relationship of TAQOZ but having TAQOZ looking for some 'bootfile.fth' on SD at startup, loading a startup script, would be wonderful.
On top of the ability to load a bootsector or bootfile ala @Cluso99, load a TAQOZ start script. 'Autoexec.tqz'? 'cexeotua.tqz? the name does not really matter... it is a editable text file! (well somehow, it will be FORTH)
It could load a additional dictionary or even your full TACHION, but it also could run other programs from SD or just load some TAQOZ firmware to make a serial controlled servo controller out of a P2.
J- CLK/4 = CLK/2 & 8MHZ ;
K- CLK/4 = CLK/2 & 8MHZ ;
RAMOE* = IOEN* # ( IOEN* ! & R/W ) ;
RAMWE* ! = IOEN* ! & R/W ! & PH2 ;
WRITE* ! = R/W ;
BUSEN* ! = IOEN* ! ;
; Multiplexer function - DUAL 4 TO 1
VDAT1 ! = ( D0 & CLK/2 ! & CLK/4 ! )
# ( D1 & CLK/2 & CLK/4 ! )
# ( D2 & CLK/2 ! & CLK/4 )
# ( D3 & CLK/2 & CLK/4 ) ;
It is really nice to be able to use the P2 out of the box to do a few tests, etc, all without loading any code!!!
jmg wrote: »
For a regulator upgrade, in my trawling regulators, I did find some well priced, well spec'd regulators and from OnSemi
Best 'low voltage, small regulator for P2, with PGood' looks to be NCV6324BMTAAWTBG
(but there is also NCP6354, NCP6334B, NCP6324B, NCV6324B alternates here) - cheapest and newest data of those is NCx6324B ( OnSemi say 3000 $0.36 Data: May, 2017 − Rev. 5)