Re: CF card connection to PPC CPUs

["Travis B. Sawyer" <tsawyer@broadcom.com>]

Andriy Korud wrote:

>Hi,
>Does anybody has experience in connecting CF card to PPC (especially
>44x) CPU directly via EBC bus?
>I see how this can be done in TrueIDE mode, but unfortunately our
>application requires hot swap capability.
>
>  
>
Andriy:

We've done the direct connect route on a couple of our platforms 
(formerly Sandburst Metrobox).
Unfortunately, as you state, you lose HS caps.

We used two chip selects, and connected the bus as follows:

EBC Addr 28:30 <-> CF Addr 2:0

EBC Data   CF Data
8                    15
9                    14
10                  13
11                  12
12                  11
13                  10
14                  9
15                  8
0                    7
1                    6
2                    5
3                    4
4                    3
5                    2
6                    1
7                    0

/OE  & /CSEL are pulled down
/REG & /WE are pulled up.

Check out Das U-Boot Sandburst Metrobox (include/configs/METROBOX.h) for 
usage info.
We essentially used a technote/appnote from Toshiba (that I can't find 
right now).

Good luck,

travis