[SI-LIST] Re: Bus Transceivers & Termination Resistors
- From: "Mikhail Matusov" <matusov@xxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 22 Mar 2005 10:57:51 -0500
Is anything else besides the SDRAM is hanging off this bus? I think your
best bet is to repeat closely what you see on the Blackfin eval board. If
you keep the traces between the DSP and the SDRAM really short I am sure it
will work. However, if there are other peripherals hanging off this bus,
especially if they are different from whatever is on the eval board, you
will have to be much more careful...
/Mikhail
----- Original Message -----
From: "Chinmoy Raj H" <hotacr@xxxxxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, March 22, 2005 8:49 AM
Subject: [SI-LIST] Bus Transceivers & Termination Resistors
> Hi all,
>
> This is the first time I am mailing to the group.
> May be my mail is quiet long and the questions also very simple.
> But just wanted to get my doubts cleared. Hence, thought to take help of =
> you all.
>
> Is it really required to use Bus Transceivers on the Address and DataBus
> lines of the Processor ?
> I had done that for coldfire mcf5272 working at 66MHz, sdram also at
> 66mhz. The eval board suggested that to use.
> The dev board for Blackfin from ADI (BF533 - internal core working at
> 400MHz and greater), SDRAM at 133MHz=20
> has not used any Bus transceivers...
> I was wondering to use them or not for my processor bf531(lower subset of
> bf533).=20
>
> Also I had used Terminations Resistors on the address and data bus lines
> for the coldfire.
> but they hav not been used in bf533 dev board....
> I was again wondering...
>
> wat do you say.... aren these necessary for high speed design ?
>
> any other doc u have which suggests on general care that need to be
> taken for high speed desgin.
> ya, i know the book "blackmagic"....
> i am going thro it... but quiet difficult to undetrstand and also inneed
> to completye the design in two weeks time..
> hence was wondering if i get some general pdf explainign general care to
> be taken for high speed design.
> becos now my board based on bf531 will be working literally on 133mhz
> (sdram) albeit core is at 400mhz.
>
> regards,
> chinmoy,
>
>
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