ok thanks.
back on sd card, is there a way to read and write at the same time, I
mean, do I have to stop_read/start_write and stop_write/start_read to
switch between 2 modes, or is there something easier ?
also, is it possible to partial partial sector ? (though I think I
know the answer...)
tia
cheers
seb
--
Sébastien Lelong
Le 3 mai 2011 à 15:10, mattschinkel <[email protected]> a
écrit :
Very good Seb, just remember not to allow SD chip select to go
inactive in the middle of a sector.
Matt.
On May 3, 4:58 am, Sebastien Lelong <[email protected]>
wrote:
Hi guys,
I added an optional SPI EEPROM (SOIC package) to Jaluino Bee. It's
also pin
compatible with 23K256 SRAM, and also with a SST serial flash. So
PCB would
work with an extra EEPROM, SRAM and Flash.
I added a 100nF decoupling cap. /WP (Write Protect) and /HOLD
(pause) are
tied to 3V3, so always enabled (so no write protect, and no hold/
pause) in
order to save few pins. Solder jumper is here to choose the Chip-
Select pin
depending on the PIC being used (25K22 or 27J53)
[image: spi_eeprom_sram.png]
Cheers,
Seb
2011/4/21 Oliver Seitz <[email protected]>
I perfer the RAM due to fast
read/write speeds, high endurance. Does
SST have any serial ram? What is the write speed of SST
flash?
I was about to write that... But then I realized that both chips
were pin
compatible, so the PCB would work with ram or flash ;-)
Greets,
Kiste
spi_eeprom_sram.png
13KViewDownload
--
You received this message because you are subscribed to the Google
Groups "jallib" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to [email protected]
.
For more options, visit this group at http://groups.google.com/group/jallib?hl=en
.
--
You received this message because you are subscribed to the Google Groups
"jallib" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/jallib?hl=en.
