P1010RDB TWBE NAND parameter

[renaud]

I see that in the U-Boot support package for the P1010RDB-PB that the NAND MT29F16G08ABABAWP is used.

I noticed that the parameter TWBEis set to 0x39 = 57. Assuming the IFC clock is 100 MHz or 10ns. That would

set TWBE to 570ns. That seems to be 5 times above the maximum specified in the NAND timing (tWB) that can be from

200 to 100 ns depending on the mode. Is there a reason for that?

Cheers,

Renaud

[yipingwang]

Hello Renaud,

The IFC NAND TWBE parameter is calculated according to NAND flash parameters, please refer to the related NAND Flash datasheet.

TWBE = ROUNDUP((twb-twh)*（NAND flash  Clock Frequency）/1000)

twb is 200ns

twh is 30ns

clock frequency is 330MHz

TWBE = ROUNDUP（(200-30)*330/1000）=57

Have a great day,
Yiping

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