Datasheet

Section 17 ROM
Rev.7.00 Feb. 14, 2007 page 613 of 1108
REJ09B0089-0700
17.11.4 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 17.16 AC Characteristics in Memory Read Mode
Conditions: V
CC
= 3.3 V ±0.3 V, 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
WE rise time t
r
— 30 ns
WE fall time t
f
— 30 ns
CE
A
18 to A
0
Data H'00
OE
WE
Command write
t
wep
t
ceh
t
dh
t
ds
t
f
t
r
t
nxtc
Note: Data is latched at the rising edge of WE.
t
ces
Memory read mode
Address stable
Data
Figure 17.22 Memory Read Mode Timing Waveforms after Command Write