Demultiplex MCF5208 data/address

Paul Arnold <[email protected]> Thu, 29 Jan 2009 15:27:06 +0000
Newsgroups gmane.comp.hardware.motorola.microcontrollers.coldfire
Message-ID <A617BFD3036D4446AE4B64E396479B6B2ED016AB8F@exchange.bellfruit.local>
Hi,

I've=20posted=20the=20following=20question=20on=20Freescales=20Coldfire=20=
forum=20but=20thought=20I'd=20post=20it=20here=20too=20in=20case=20some=20=
don't=20visit=20Freescale.

I=20need=20to=20regenerate=20some=20of=20the=20missing=20address=20lines=20=
on=20the=20MCF5208.
I=20see=20from=20the=20spec=20that=20during=20the=20first=20clock=20cycle=20=
the=20data=20bus=20is=20driven=20with=20the=20address=20so=20I=20assume=20=
this=20can=20somehow=20be=20used=20to=20obtain=20the=20missing=20address=20=
lines=20I=20want.
=20
From=20the=20timing=20diagrams=20the=20data=20bus=20is=20driven=20with=20t=
he=20address=20a=20max=20of=207ns=20after=20the=20rising=20edge=20of=20FB_=
CLK,=20this=20is=20the=20same=20time=20as=20/TS=20is=20driven.=20=20This=20=
leaves=205ns=20before=20FB_CLK=20goes=20high=20again=20and=20/TS=20and=20t=
he=20data=20bus=20are=20stopped=20being=20driven.
=20
I=20obviously=20need=20to=20somehow=20use=20/TS=20but=20as=20it=20seems=20=
to=20be=20asserted=20and=20negated=20at=20the=20same=20time=20as=20the=20d=
ata=20bus=20I=20don't=20see=20how.
=20
Can=20anyone=20on=20here=20help=20?
=20
Thanks
Paul

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