W39V040B_07 Datasheet, PDF (15/33 Pages) Winbond – 512K × 8 CMOS FLASH MEMORY WITH LPC INTERFACE

9.4 Embedded Toggle Bit Algorithm
Start
Read Byte
(DQ0-DQ7)
Read Byte
(DQ0-DQ7)
No
Toggle Bit
=Toggle ?
Yes
No
DQ5 = 1 ?
Yes
Read Byte
(DQ0-DQ7) twin
No
Toggle Bit
=Toggle ?
W39V040B
Fail
Pass
Note: Recheck toggle bit because it may stop toggling as DQ5 changes to “1”.
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Publication Release Date: December 12, 2005
Revision A4