Rockbox mail archiveSubject: Re: H3x0 ISP1362 (usbotg) chip connections
Re: H3x0 ISP1362 (usbotg) chip connections
From: Peter D'Hoye <peter.dhoye_at_telenet.be>
Date: Sun, 19 Feb 2006 21:36:19 +0100
> Knowing the schematic can be a great deal of help,
> but I suppose it's a hassel to disect a player.
> A0 as far as the Coldfire is concerned is for byte
> addressing, on a 16bit bus, thus excluded.
> A0 on the ISP1362 should be for word addressing
> since it has a 16bit bus.
> Thus Coldfire <=> ISP1361
> A1 <-> A0
> A2 <-> A1
> Which should make it transparent on the bus as
> 16-bit "memory".
> Though read/write is a hassle since the coldfire is
> R/!W while the ISP1362 has !R and !W signals.
> Presumably a solution like for the h300 LCD is used,
> thus an Address pin might be used as !R while R/!W
> is connected to !W.
> Hope this helps, now sleep.
I resorted to writing a scanner that tries all possible
combinations, (0x0 -> 0xF for both cmd and data)
no luck so far :(
I read 0x0, 0x1000 and 0x27 in all its combinations
(0x27 is the reg number I write to the cmd reg)
any more hints?
Received on 2006-02-19