Rev. 1.0, 02/00, page 159 of 1141
7.8.4
Memory Read Mode
•
After the end of an auto-program, auto-erase, or status read operation, the command wait state
is entered. To read memory contents, a transition must be made to memory read mode by
means of a command write before the read is executed.
•
Command writes can be performed in memory read mode, just as in the command wait state.
•
Once memory read mode has been entered, consecutive reads can be performed.
•
After power-on, memory read mode is entered.
Table 7.11
AC Characteristics in Memory Read Mode (1)
−−−−
Preliminary
−−−−
Conditions: V
CC
= 5.0 V
±
10%, V
SS
= 0 V, Ta = 25
°
C
±
5
°
C
Item
Symbol
Min
Max
Unit
Notes
Command write cycle
t
nxtc
20
µ
s
&(
hold time
t
ceh
0
ns
&(
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
:(
rise time
t
r
30
ns
:(
fall time
t
f
30
ns
CE
A18 to A0
IO7 to IO0
DATA
OE
WE
Command write
t
wep
t
ceh
t
dh
t
ds
t
f
t
r
t
nxtc
Note: Data is latched on the rising edge of WE.
t
ces
Memory read mode
ADDRESS STABLE
DATA
Figure 7.16 Memory Read Mode Timing Waveforms after Command Write