Lpc2000

--- In lpc2000@yahoogroups.com, Charles Manning <manningc2@a...> 
wrote:
> To implemt a NAND interface you will need more than just the 8 data 
pins, you 
> will also need:
> 
> CLE, ALE, CE, RE and WE.
> 
> You can probably ignore the R/B line and jsut read back status.
> 
> Assuming you are not using SPI at the same time as the NAND, 
youcould 
> potentially multiplex the SPPI data pins with two NAND pins and 
save two pins.
> 
> NAND is pretty fun stuff. I suggest you go read stuff about NAND on 
the linux 
> mtd and YAFFS www. 
> 
> -- CHarles

We had considered NAND control pins, 
they are posited on the rest pins.
For easy implementing the NAND flash driver,
we'd like to put NAND data pins in a byte alignment.
That would save some instructions, although the Philips Set-Clear 
GPIO operation already costs more instructions to implement data I/O.
( anybody know that why Philips uses this kind of GPIO operation 
instead of direct setting 0 or 1 ? )

As for I2C and SPI, we use I2C for LCD and SPI for SD Card.
Besides, we need to transfer data from NAND to SD Card.