Re: J5 definition

For selecting between the two possible UARTs on the daughterboard, I would
guess that pin 18 which corresponds to address bit 3 is probably used for that.
 My guess is that address 0x002c0000 starts UART1 and 0x002c0008 starts UART
two.  I would also guess that one or more of the GPIO signals on J5 are used
for the UART interrupt signals.

On a side note, the CX82100 USB interface is only capable of running in slave
mode.  It cannot act as a root hub.  Unfortunately that makes using that port
for expansion purposes very hard.

Patrick M

--- Scott Christensen <[email protected]> wrote:
> My bad.  I should have noticed the uart is U3 on the daughtercard, not U5.  
> Sorry.
> 
> Is there a "U1, U2, U3" nomenclature for the modem card somewhere on the 
> wiki?  I dug around but didn't see it on any of these wiki pages:
> 
>
http://www.embeddedlinuxinterfacing.com/wiki.php/ActiontecDevelopmentDaughterboard
> http://www.embeddedlinuxinterfacing.com/wiki.php/ActiontecPartDocumentation
> http://www.embeddedlinuxinterfacing.com/wiki.php/ActiontecSpecifications
> 
> The J5-15 connection coming off a '138 is a bit interesting.  That would 
> imply some address decode expansion from a single chip select outta the 
> processor.  Do you know what are the cpu side connections of the '138?
> 
> How does the daughtercard differentiate CS for uart 1 and uart 2?  (address 
> line decode on the daughter card, with both using J5-15?)
> 
> Thanks.
> 
> 
> >From: Patrick McNamara <wpmcnamara-/[email protected]>
> >Reply-To: ActionHack Mailing List <actionhack-W7/[email protected]>
> >To: ActionHack Mailing List <actionhack-W7/[email protected]>
> >Subject: Re: [actionhack] J5 definition
> >Date: Fri, 20 Feb 2004 07:17:46 -0600
> >
> >Pin 16 does have it's connection on the modem listed.  It is connected to 
> >U5, pin 15.  U5 is the 74LVC138A.
> >
> >Patrick M
> 
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