NOR Timing Calculations

lonnie · ‎2008-10-30

Posted on October 30, 2008 at 11:42

lonnie · ‎2011-05-17

Posted on May 17, 2011 at 12:50

In AN2784 (pg. 11) the value for NOR Flash(M29W128FL70Z) FSMC parameter datast is shown to be 6.

According to the app note the formula to calculate tWP is:

DATAST Ã— HCLK = tWP

therfore:

DATAST = tWP/HCLK

HCLK = 72Mhz

tWP = 45ns (In the M29W128FL70Z datasheet tWP = 35ns)

The calculations aren't worked out in the app note, but twp/(1/HCLK) doesn't equal 6.

Does anyone know how the value of six was computed for datast.

thanks in advance.

[ This message was edited by: lonnie.walker on 30-10-2008 16:23 ]

[ This message was edited by: lonnie.walker on 30-10-2008 16:26 ]