Peter D'Hoye wrote:
Hi all (but mostly Linus),
I'm having troubles accessing the isp1362 chip
in the H3x0. I've mapped its CS to 0x30000000
and tried several options in CSCR3 (no success).
I wonder about this:
- MCF5249 users manual page 172, in table 10-9
about the PS[1:0] CS select bit description
there is a note: "A0 is not available on the
external bus". If so, I wonder where A0 and A1
of the isp1362 are connected to.
- the isp1362 datasheet on page 49 (point 12.9)
talks about the powermanagement, and mentions
two pins that must be pulled low to enable
device and host part of the chip respectively.
So they are probably connected to the GPIO?
The two pins should be tied to vcc using a
resistor. Or I don't understand that part :(
fyi, A0 is pin 61, A1 is pin 62
shall I put the code I have so far somewhere?
thnx,
Peter
/* Disclaimer - it's 6.00am after a party */
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.
/Anders
