[SI-LIST] Re: Cmos I/O & GTL I/O
- From: Rajat Chauhan <rajat@xxxxxxxxxxxx>
- To: sunil-chandra.kasanyal@xxxxxx
- Date: Mon, 17 Nov 2003 14:17:13 +0530
But Sunil, i have seen CMOS drivers with well controlled impedance
can be used for more than 200MHz.
Rajat
Sunil Chandra KASANYAL wrote:
>
> Partha,
>
> 'Source terminated CMOS I/O' means the IO whose output impedance is
> equal to the transmission line impedance for matching at the source end.
> It is not necessary to keep the output buffer impedance equal to the
> trasmission line impedance, but the matching can be achieved by
> providing a resistance at source end. If your driver has perfact
> matching with transmission line than this architecture will be same as
> the series terminated case.
> GTL has the open drain architecture of output buffer having very high
> current sinking capability. GTL IO is terminated at the receiver end of
> the transmission line.
> In source terminated case, signals are terminated at source end after
> reflection at receiver end, but in case of GTL, signal is terminated at
> the end of the transmission line and no reflections will be there if
> termination is proper.
> CMOS IOs are generally used for lower frequency of operation which is
> about 50 to 60 MHz. GTL IOs are used for backplan operation where driver
> current capability is required very high (about 40mA).
> Also, source terminated IOs are not preferred for multidrop
> application
> but if termination is at the receiver end, IOs can be used for multidrop
> operations.
>
> Am I right ??
>
> Thanks and Regards,
> Sunil C Kasanyal
>
> -------------------------------------
> Hi all,
> What does it mean when one says 'Source Terminated
> CMOS I/O'? How is it different compared to GTL(Gunning
> Trancsiever Logic I/O) and what are their advantages &
> disadv when compared with each other?
>
> Thanks in Advance,
>
> Regards,
> Partha!
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