Re[3]: i960RP - host downloading code

[Noam Efrati <noam@genie.terra.co.il>]

>
> Text item:
>
>      First I wish to thank all the people for thier 
>      answers, some of them were helpfull.
>
>      I think my questions were not fully understood,
>
>      so I will try to make the point.
>
>      see details below...
>
>      noam.
>
>
> ______________________________ Reply Separator ______________________________ 



1)

::
:: The RP has a special powerup mode that keeps JUST THE
:: CORE in reset.  This allows a host to download the code 
:: to the RP memory, then release the CORE from reset by
:: clearing a bit in the Extended Bridge Configuration 
:: Register.  This ensures the memory is Pre-loaded before 
:: the RP starts to fetch the IBR.
::
>  I understand this powerup mode (mode 0 in page 11-5). The proccess
>  seems to be quite clear. The point I don't understrand is this:
>  If the memory is configured to 8 bit (this comes from the fact that 
>  the PMCON is set to 8 bit width on power up, and can't be changed
>  as long as the CORE is held in reset), how can the host transfer 
>  the code data to the 32 bit width memory ?
>                       ------------
>
>

2)

::
:: You are correct for add-in cards. It is very difficult to implement
:: downloadable software unless you have control of the configuration
:: software.  The RP a direct connect memory controller interface to 
:: add a small boot FLASH device.  I would recommend this implementation
:: for add-in card type of applications who do NOT have control of the
:: Host configuration software.  
::
:: 
>  Let me see if I understand. You are actualy saying that if my device 
>  driver cannot control the configuration software, I can't change the
>  window size to more than 4k ? 
>  If this is the case, then the i960RP will give very poor performance...
>                                                 ---------------------



>
> Thanks in advance,
>
> ========================================================================= 
> Noam Efrati                    | e-mail: noam@terra.co.il
> Terra computers ltd.           | phone : 972-7-467502 
> 6 Ashuach st., Omer,           | fax   : 972-7-467475 
> 84965 Israel                   |
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