Lpc2000

Bugger! that totally screws up the filing system I use for flash 
database management, and probably the main application I have in mind 
for this part. My response was purely a generic one related to flash, as 
I've not yet got my hands on any LPC silicon.

philips_apps wrote:

> 
> Hi Al,
> 
> even changing some bits from 1 to 0 would generate a wrong reading.
> The LPC2000 devices have an error correction  ECC mechanism build in.
> This is part of the flash and will be written the first time (after
> erasing) the block of 128-bits is programmed. Any changes thereafter
> will result in reading garbage because the ECC mechanism will try to
> correct anything changed after the initial write.
> 
> The idea was to write one 128-bit block after the other, NOT writing
> the same 128-bit block several times. This is possible 16 times within
> a 4k block. So 16 writes to 16 different sections of 128-bit each
> within a 4k block, then erase the 4k block.
> 
> Hopefully this clarifies this issue a little more.
> 
> 
> --- In lpc2000@yahoogroups.com, onestone <onestone@b...> wrote:
>  > Flash bits can only be written to '0'. They erase to a '1' state.
>  > Therefore unless you are only changing a couple of bits to '0' you MUST
>  > erase flash everytime before reprogramming it.
>  >
>  > Al
>  >
>  > Leighton Rowe wrote:
>  >
>  > >
>  > > Concerning Philips Apps' post on Partial Flash Programming I
>  > > understand lpc flash memory can be updated 128 bits (minimum) at a
>  > > time, and that a each 4K area can be written 16 times (max).
>  > >
>  > > (http://groups.yahoo.com/group/lpc2000/message/2681)
>  > >
>  > > However, I'm currently having trouble updating 128-bit (quadword
>  > > aligned) locations in flash memory. The first write always
>  > > show up OK (as long as the location has all 1's), but on the 2nd
>  > > write (on the same location) results in some bit(s) not displaying
>  > > correctly.
>  > >
>  > > Is it possible for me to re-write a 128-bit (quadword aligned) flash
>  > > locations? Or must I erase the flash location first? I can do the
>  > > second question, but I'm a little confused about how often flash
>  > > bits can change without an erase.
>  > >
>  > > best regards,
>  > > Leighton
>  > >
>  > >
>  > >
>  > >
>  > > Yahoo! Groups Sponsor
>  > >
> <http://us.ard.yahoo.com/SIG=129krqpo6/M=324847.5707095.6763799.3001176/D=groups/S=1706554205:HM/EXP=1102615194/A=2343726/R=0/SIG=12ibhs9he/*http://clk.atdmt.com/VON/go/yhxxxvon01900091von/direct/01/&time=1102528794344024 
> <http://us.ard.yahoo.com/SIG=129krqpo6/M=324847.5707095.6763799.3001176/D=groups/S=1706554205:HM/EXP=1102615194/A=2343726/R=0/SIG=12ibhs9he/*http://clk.atdmt.com/VON/go/yhxxxvon01900091von/direct/01/&time=1102528794344024>>
> 
>  > >
>  > >
>  > > Get unlimited calls to
>  > >
>  > > U.S./Canada
>  > >
>  > >
> <http://us.ard.yahoo.com/SIG=129krqpo6/M=324847.5707095.6763799.3001176/D=groups/S=1706554205:HM/EXP=1102615194/A=2343726/R=1/SIG=12ibhs9he/*http://clk.atdmt.com/VON/go/yhxxxvon01900091von/direct/01/&time=1102528794344024 
> <http://us.ard.yahoo.com/SIG=129krqpo6/M=324847.5707095.6763799.3001176/D=groups/S=1706554205:HM/EXP=1102615194/A=2343726/R=1/SIG=12ibhs9he/*http://clk.atdmt.com/VON/go/yhxxxvon01900091von/direct/01/&time=1102528794344024>>
> 
>  > >
>  > >
>  > >
>  > >
> ------------------------------------------------------------------------
>  > > Yahoo! Groups Links
>  > >
>  > >     * To visit your group on the web, go to:
>  > >       http://groups.yahoo.com/group/lpc2000/
>  > >       
>  > >     * To unsubscribe from this group, send an email to:
>  > >       lpc2000-unsubscribe@yahoogroups.com
>  > >       <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe>
>  > >       
>  > >     * Your use of Yahoo! Groups is subject to the Yahoo! Terms of
>  > >       Service <http://docs.yahoo.com/info/terms/>.
>  > >
>  > >
> 
> 
> 
> 
> Yahoo! Groups Sponsor
> ADVERTISEMENT
> <http://us.ard.yahoo.com/SIG=1291lt2ob/M=295196.4901138.6071305.3001176/D=groups/S=1706554205:HM/EXP=1102663621/A=2128215/R=0/SIG=10se96mf6/*http://companion.yahoo.com>
> 
> 
> ------------------------------------------------------------------------
> Yahoo! Groups Links
> 
>     * To visit your group on the web, go to:
>       http://groups.yahoo.com/group/lpc2000/
>        
>     * To unsubscribe from this group, send an email to:
>       lpc2000-unsubscribe@yahoogroups.com
>       <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe>
>        
>     * Your use of Yahoo! Groups is subject to the Yahoo! Terms of
>       Service <http://docs.yahoo.com/info/terms/>. 
> 
>