Am29F040

17

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

Figure 6.

Maximum Negative Overshoot Waveform

Figure 7.

Maximum Positive Overshoot Waveform

Start

Fail

Yes

DQ6 = Data

?

Yes

Pass

No

No

Yes

DQ6 = Data

?

DQ5 = 1

?

No

Read Byte

(DQ0–DQ7)

Addr = VA

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

17113E-10

20 ns

20 ns

+0.8 V

–0.5 V

20 ns

–2.0 V

17113E-11

20 ns

2.0 V

20 ns

20 ns

17113E-12