KEY TO SWITCHING WAVEFORMS
WAVEFORM
INPUTS
OUTPUTS
Steady
Changing from H to L
Changing from L to H
Don’t Care, Any Change Permitted
Does Not Apply
Changing, State Unknown
Center Line is High Impedance State (High Z)
SWITCHING WAVEFORMS
Device and
Address Selection
Data
Valid
Outputs
Enabled
Power-up, Standby
Standby, Power-down
Addresses Stable
Addresses
t
(t
)
AVAV RC
CE#
t
EHQZ
(t
)
DF
OE# (G#)
t
t
WHGL
GHQZ
(t
)
DF
WE# (W#)
t
(t
)
GLQV OE
t
(t
)
ELQV CE
t
(t
)
AXQX OH
t
(t
)
GLQX OLZ
t
VCS
t
(t )
ELQX LZ
High Z
High Z
Output Valid
Data (DQ)
t
(t
)
AVQV ACC
5.0 V
V
CC
0 V
18879C-18
Figure 9. AC Waveforms for Read Operations
26
Am28F256A
SPANSION [ SPANSION ]
