Re: [microblaze-uclinux] uclinux port to Multimedia board

[didier delacretaz <didier_delacretaz@xxxxxxxx>]

Hello Mark,

the parameter "C_EXTERNEL_DDL" is set to "1" on my zbt controllers, i'm
using DCM.

I tried to connect my zbt on an emc, but i can't understand how to do it
with more then one bank, must I do a peripheral for this ?

Thanks,
Didier

Mark.Hsieh@genesyslogic.com.tw wrote:
> Hi Didier,
> opb_zbt_controller has a feature to choose the implementation of "C_EXTERNAL_DLL".
> The clock path to external ZBT and a clock feedback from external load form a delay-lock-loop to syncronous the clock.
> You need one for each opb_zbt_controller but the available DLLs are rare. There are 5 ZBT bank needs clock on the multimedia board.
> Maybe you can choose not to  implement "C_EXTERNAL_DLL" and use DCM and BUFG to syncronous these clocks.
> Maybe you can use OPB_EMC because it can handle multi-bank ZBT control.
> Please check  "Xilinx OPB ZBT Controller Design Spec".
> Best regards,
> Mark

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