And use the 'worst case' timings, not the 'typical' numbers!!! Bob Ammerman RAm Systems ----- Original Message ----- From: "Neil Cherry" To: "Microcontroller discussion list - Public." Sent: Monday, March 28, 2005 10:36 AM Subject: Re: [EE] Calculating wait states? > Dave VanHorn wrote: >> At 09:18 AM 3/28/2005, Neil Cherry wrote: >> >>> Olin Lathrop wrote: >>> >>>> Neil Cherry wrote: >>>> >>>>> I'm working with external ram on an ARM processor. How do I figure >>>>> out what # of wait states I need to use to properly access the >>>>> memory? >>>> >>>> >>>> Read memory data sheet to see how much time it needs. Read processor >>>> manual to see how much time each access gets, plus how much time each >>>> wait state adds. Make sure total result of B meets or exceeds A. >>> >>> >>> Thank! I looks like I should have followed the 'obvious'. :-) >> >> >> With the emphasis on EXCEED. >> > > 'Close enough for government work' is not good enough, got it. :-) > > Thanks > > -- > Linux Home Automation Neil Cherry ncherry@comcast.net > http://home.comcast.net/~ncherry/ (Text only) > http://hcs.sourceforge.net/ (HCS II) > http://linuxha.blogspot.com/ My HA Blog > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist