20

Am29F400AT/Am29F400AB

PRELIMINARY

Figure 4.

Toggle Bit Algorithm

Figure 5.

Maximum Negative Overshoot Waveform

Figure 6.

Maximum Positive Overshoot Waveform

Start

Fail

No

DQ6=Toggle

?

No

Pass

Yes

No

Yes

Note:

DQ6 is rechecked even if DQ5 = “1” because DQ6 may stop toggling at the same time as DQ5 changing to “1”.

DQ6=Toggle

?

DQ5=1

?

Yes

Read Byte

(DQ0–DQ7)

Addr=Don’t Care

Read Byte

(DQ0–DQ7)

Addr=Don’t Care

20380B-11

20 ns

20 ns

+0.8 V

-0.5 V

20 ns

-2.0 V

20380B-12

20 ns

2.0 V

20 ns

20 ns

20380B-13