Lpc2000

Gentleman,
look at your BCFG value. it determines our read/write and wait state and idle time between two  read/write ...
You have to minimize this as you requirement is 15 byte per microsecond measns 66ns per byte time...
k b shah
  ----- Original Message ----- 
  From: itsjustimpossible 
  To: lpc2000@yahoogroups.com 
  Sent: Tuesday, July 05, 2005 4:29 AM
  Subject: [lpc2000] Re: LPC2294 External Bus Speed


  Hi
  In an ideal world I would like to achieve number 2...

  2) " Finish 15 bytes with in 1 uS after the edge that causes FIQ"

  However I appreciate that may be a tall order when taking interrupt 
  latency into account.

  At a push I would settle with being able to transfer 15 bytes in 
  less than 1uS. Not including the interrupt latency of the FIQ.

  best regards
  Simon 

  --- In lpc2000@yahoogroups.com, "donhamilton2002" <hamilton@d...> 
  wrote:
  > --- In lpc2000@yahoogroups.com, "itsjustimpossible" <simonjh@b...> 
  wrote:
  > 
  >     I would like to clarify your request.
  > 
  > > Hi
  > > There have been a few messages about this, but I can't find 
  anything 
  > > explicit so I thought I would ask a quick question.
  > > 
  > > In an FIQ I need to transfer 15 bytes to an external device in 
  less 
  > > than 1uS.
  > > 
  > 
  >    Does this mean :
  > 
  >    1) " Start transfering 15 with 1uS after the edge that causes 
  FIQ"
  >    2) " Finish 15 bytes with in 1 uS after the edge that causes 
  FIQ"
  > 
  > 
  > > Is this possible? Unless I am completely off track (probable), 
  it 
  > > looks like it should be.
  > > 
  > 
  >    As you can see the timing of these two cases is very dramatic.
  > 
  > 
  > > The bus is 8-bit with no wait states. We are using the PLL to 
  give a 
  > > 60MHz core clock and the peripheral clock is set equal to the 
  core 
  > > clock. The MAM is enabled.
  > > 
  > > I can't seem to achieve anywhere near this figure.
  > > 
  > > Any thoughts would be greatly appreciated.
  > > 
  > > many thanks
  > > Simo
  > 
  > 
  > Thanks
  > 
  > donhamilton





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