Re: [f-cpu] Control signals on the Xbar

[Just an Illusion <illusion_to_net@yahoo.fr>]

Hi,

Yann Guidon wrote:

>hi,
>
>i have too much troubles with your modifications to the
>ROP2 unit, because you changed the scheduling of the units.
>
Do you understand now the problem of non-definition of communication 
process between blocks ?

>
>Now the C and VHDL version do no behave the same way
>and that's not a good news because it worked before.
>
>Could you please move the mode and the size control bits
>to the Xbar ? including their pipeline in the ROP2 unit
>creates problems both in C and VHDL.
>
Do you understand now, the necessity to clearly define the block 
interface and the communication protocols ?

>
>
>Concerning the "stalled" signal : it is not present in
>the ROP2 files, because the rop2_xbar and rop2_unit
>stages are "included" from the Xbar which will perform
>the "if (!stalled)" thing. The execution units should
>not contain the input and output pipeline latches
>because it's the job of the Xbar. You just added a
>pipeline stage with a conditional thing inside ROP2,
>which makes it very different.
>
>I'm going to keep some of your modifications but
>i'll have to remove the tmp_* which should be in
>the Xbar file.
>
>WHYGEE
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@+
Just an Illusion

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