A.C. Write Waveforms (Word Mode)
OE
CE1,2
WE
tAS
A1-A8
A9-A19
DATA
tWP
tAH
tDH
BYTE
ADDRESS
SECTOR
ADDRESS
tDS
WORD 0
WORD 1
tWPH
tBLC
WORD 2
tWC
WORD 254 WORD 255
1. A20 and A21 specify the pair of AT29C040A devices to be writ-
ten; they must be valid throughout the entire WE low pulse. A0 is
don’t care.
2. A9 through A19 must specify the sector address during each high
to low transition of WE (or CE).
3. OE must be high when WE and CE are both low.
4. All bytes that are not loaded within the sector being pro-
grammed will be indeterminate.
12
AT5FC004