am42dl3224gt71it Meet Spansion Inc., am42dl3224gt71it Datasheet - Page 57

• Manufacturer Part Number: am42dl3224gt71it
• Description: Stacked Multi-chip Package Mcp Flash Memory And Sram 32 Megabit 4 M X 8-bit/2 M X 16-bit Cmos 3.0 Volt-only, Simultaneous Operation Flash Memory And 4 Mbit 256 K X 16-bit Static Ram
• Manufacturer: Meet Spansion Inc.

AC CHARACTERISTICS
SRAM Write Cycle
Notes:
1. WE# controlled.
2. t
3. t
4. t
5. A write occurs during the overlap (t
6. If CE1# goes low (or CE2 goes high) at the same time or after WE# goes low, the outputs will remain at high impedance.
7. If CE1# goes high (or CE2 goes low) at the same time or before WE# goes high, the outputs will remain at high impedance.
8. If OE# is high during the write cycle, the outputs will remain at high impedance.
9. Output data may be present on the bus at this time; input signals should not be applied.
May 19, 2003
Parameter
asserting UB#s or LB#s for a single byte operation or simultaneously asserting UB#s and LB#s for a double byte operation. A
write ends at the earliest transition when CE1#s goes high and WE# goes high. The t
to the end of write.
CW
WR
AS
Symbol
t
is measured from the address valid to the beginning of write.
t
t
t
t
t
t
t
t
WHZ
t
t
is measured from CE1#s going low to the end of write.
is measured from the end of write to the address change. t
WC
BW
WP
WR
DW
OW
Cw
AW
DH
AS
Address
CS1#s
CS2s
UB#s, LB#s
WE#
Data In
Data Out
Description
Write Cycle Time
Chip Enable to End of Write
Address Setup Time
Address Valid to End of Write
UB#s, LB#s to End of Write
Write Pulse Time
Write Recovery Time
Write to Output High-Z
Data to Write Time Overlap
Data Hold from Write Time
End Write to Output Low-Z
(See Note 6)
(See Note 9)
Figure 30. SRAM Write Cycle—WE# Control
WP
) of low CE#1 and low WE#. A write begins when CE1#s goes low and WE# goes low when
High-Z
(See Note 4)
P R E L I M I N A R Y
t
AS
Am42DL32x4G
t
WR
WHZ
(See Note 2)
(See Note 2)
applied in case a write ends as CE1#s or WE# going high.
t
AW
t
(See Note 5)
WC
t
t
t
CW
BW
CW
Max
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
min
t
WP
t
DW
Data Valid
WP
70, 85
70
60
60
60
50
20
30
is measured from the beginning of write
0
Speed Options
t
WR
t
DH
t
(See Note 3)
OW
0
0
0
5
High-Z
71
55
45
45
45
40
20
25
(See Note 9)
(See Note 7)
0
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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