AM29F040 Datasheet, PDF (17/33 Pages) Advanced Micro Devices – 4 Megabit (524,288 x 8-Bit) CMOS 5.0 Volt-only, Sector Erase Flash Memory

Start
Read Byte
(DQ0–DQ7)
Addr = VA
DQ6 = Data ^No
?
Yes
No
DQ5 = 1
?
Yes
Read Byte
(DQ0–DQ7)
Addr = VA
VA = Byte address for programming
= Any of the sector addresses within the
sector being erased during sector erase
operation
= XXXXH during chip erase
DQ6 = Data ^No
?
Yes
Fail
Pass
Note:
DQ6 is rechecked even if DQ5 = “1” because DQ6 may stop toggling at the same time as DQ5 changing to “1”.
Figure 5. Toggle Bit Algorithm
17113E-10
+0.8 V
20 ns
20 ns
–0.5 V
–2.0 V
20 ns
Figure 6. Maximum Negative Overshoot Waveform
20 ns
V_CC + 2.0 V
V_CC + 0.5 V
2.0 V
20 ns
20 ns
Figure 7. Maximum Positive Overshoot Waveform
17113E-11
17113E-12
Am29F040
17