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The previous analysis greatly overstates the time it takes to
program a word from an internal program. The time to program a word is around 20
usecs. The 250 usecs is caused by the overhead of the transfer, the host
program, and the Mechanism of interfacing to the FIUs via the JTAG port.
But I think I should clairfy a couple of items. The time required to
program a word is set by the user. The data sheet numbers refer to requirements
placed upon the user to ensure proper programming. This is
important because if you violate the data sheet requriements in your programming
algorithm then you will not be guaranteed of the memory retention
specifications.
Section 3.4 of the Data Sheet talks about the timing
requirements for the flash programming. Basically the important timing
requirements are listed in table 25. The users manual has a whole chapter (#5)
on the flash memory interface unit. The flash interface unit is what must be
used to program the internal flash blocks. The CodeWarrior tool and I think most
customers use the intelligent flash programming mode. Basically the Intelligent
flash programming mode uses a set of internal timers to the FIU that are all
based off of the IP bus clock. The reset values are correct for an IP bus clock
of 40 Mhz. But if you are not running at 40 Mhz IP bus clock then the timer
registers need to be modified so they match up with the requirements from the
data sheet. I have included a spread sheet that shows the proper FIU timer
values to ensure proper programming depending on the IP bus
clock.
Just as a note the CodeWarrior tool and the SDK flash
over JTAG programming tool do not set the PLL and hence do not operate the part
at full rate when programming the flash. The values in the flash.cfg file set up
the timers in the FIU to be correct if a standard value oscillator is clocking
the device. Thanks !
- Bill
Hi,
Information-> Timing expericen for a
complete programming of an application
My experice for programming
the P-Flash by downloading and flashing a
complete application with the
Size of about 32kWord into the Flash 56807
(using a parallel DP-RAM for
Communication) will take about 8s. This
includes the protocol overhead,
handshaking with the hostsystem, checking if
it is required to delete and
program the new page, calculating checksum and
so on. That will take an
average (8s/32k) of 250us per Word. By optimizing
the programming
algorithmus (not to wait until the word is programmed) it
can be
redused.
rgds Chris
----- Original Message -----
From: "Art Johnson" <a...@pmc-controls.com>
To:
<g...@qem.it>
Cc: <m...@yahoogroups.com>
Sent: Friday,
October 11, 2002 4:40 PM
Subject: RE: RE: [motoroladsp] Maximun flash
program word time in 5680x> Motorola will have to answer this one for
you. All the Data Sheet shows
is minimum times. The total time
for each word is the sum of:
>
> Tads = Address setup
time,
> Tprog = Word program time, and
> Tadh = Address
hold time
>
> There are also Tnvs + Tpgs at the start of the
whole cycle, and Tpgh +
Tnvh at the end of the cycle, but these are small
compared to the total
cycle time.
>
> I think as a quick
guess that 100us per word (ie 10 words per millisecond)
would be a very
safe assumption.
>
> Regards,
>
> Art Johnson
> Senior Systems Analyst
> PMC Prime Mover Controls Inc.
>
3600 Gilmore Way
> Burnaby, B.C., Canada
> V5G 4R8
>
Phone: 604 433-4644
> FAX: 604 433-5570
> Email: a...@pmc-controls.com
>
http://www.pmc-controls.com>
>
> -----Original
Message-----
> From: g...@qem.it [mailto:g...@qem.it]
> Sent:
Friday, October 11, 2002 7:19 AM
> To: Art Johnson
> Cc:
m...@yahoogroups.com
> Subject: Rif: RE: [motoroladsp] Maximun flash
program word time in 5680x>
>
> >It depends on how much
data you need to save. The Page Erase time (page
> = 256 words)
>is 20ms minimum, and the Mass Erase (all Data Flash) time is
> 100ms
minimum. Then you >have to program each word (20us minimum for each
> word).
>
> Ok, I'm interest to know the maxium word
program time.If I have the maxium
> program time for one word, after I
can calculate my program time multiply
> the time for my word
number.
> Also when I want write, all the memory location are already
erased, so
> sector erase time is not important for me.
> I need
to write only in Data Flash.
>
> If I haven't this time I
need to use a external serial FRAM memory!!!> Regards,
>
Giuliano>
>
> -----Original Message-----
> From:
g...@qem.it [mailto:g...@qem.it]
> Sent: Friday, October 11, 2002 6:01
AM
> To: m...@yahoogroups.com
> Subject: [motoroladsp] Maximun
flash program word time in 5680x> In my product I need to store unvolatile
data when the power supply goes
> down.
> Internal flash memory
seem be right for this. The problem is that I not
> know the maximun
> programming time of internal flash. Does anyone have an idea on this
time
?
> It seems difficult to obtain!!
> Thanks
>
Giuliano>
>
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