Datasheet

Rev.6.00 Oct.28.2004 page 655 of 1016
REJ09B0138-0600H
19.22.6 Auto-Erase Mode
• Auto-erase mode supports only total memory erasing.
• Do not perform a command write during auto-erasing.
• Confirm normal end of auto-erasing by checking I/O
6
. Alternatively, status read mode can also be used for this purpose
(the I/O
7
status polling pin is used to identify the end of an auto-erase operation).
• Status polling I/O
6
and I/O
7
pin information is retained until the next command write. As long as the next command
write has not been performed, reading is possible by enabling CE and OE.
AC Characteristics
Table 19-46 AC Characteristics in Auto-Erase Mode
Conditions: V
CC
= 5.0 V ±10%, V
SS
= 0 V, T
a
= 25°C ±5°C
Item Symbol Min Max Unit
Command write cycle t
nxtc
20 — µs
CE hold time t
ceh
0—ns
CE setup time t
ces
0—ns
Data hold time t
dh
50 — ns
Data setup time t
ds
50 — ns
Write pulse width t
wep
70 — ns
Status polling start time t
ests
1—ms
Status polling access time t
spa
— 150 ns
Memory erase time t
erase
100 40000 ms
WE rise time t
r
—30 ns
WE fall time t
f
—30 ns
CE
A
18
to A
0
I/O
5
to I/O
0
I/O
6
I/O
7
OE
WE
t
ests
t
erase
t
spa
t
dh
t
ds
t
f
t
r
t
wep
t
nxtc
t
nxtc
t
ceh
t
ces
Erase end identifi-
cation signal
Erase normal end
confirmation signal
H'20
H'20
H'00
Figure 19-60 Auto-Erase Mode Timing Waveforms