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 ________________________________________________________________________ DISCLAIMER: Information=20contained=20in=20this=20email=20or=20any=20attachment=20may=20= be=20of=20a confidential=20nature=20which=20should=20not=20be=20disclosed=20to,=20copi= ed=20or=20used=20by anyone=20other=20than=20the=20addressee.=20It=20may=20also=20be=20legally=20= privileged. If=20you=20receive=20this=20email=20in=20error,=20please=20delete=20the=20= email=20from=20your=20computer=20and=20notify=20the=20sender=20immediately= =20by=20return=20E-mail. Security=20Warning:=20Please=20note=20that=20this=20email=20has=20been=20c= reated=20in=20the=20knowledge=20that=20Internet=20email=20is=20not=20a=201= 00%=20secure=20communications=20medium.=20=20 Virus=20Warning: This=20email=20has=20been=20scanned=20for=20all=20viruses=20by=20MessageLa= bs. Although=20this=20email=20and=20any=20attachment=20are=20believed=20to=20b= e free=20from=20viruses,=20it=20is=20the=20responsibility=20of=20the=20recip= ient=20to=20ensure=20that they=20are=20virus=20free.=20No=20responsibility=20is=20accepted=20by=20Be= ll-Fruit=20Games=20Ltd for=20any=20loss=20or=20damage=20arising=20in=20any=20way=20from=20their=20= receipt,=20opening=20or use. --- [email protected] Send a post to the list. [email protected] Join the list. [email protected] Join the list in digest mode. [email protected] Leave the list.