am42dl6402g Meet Spansion Inc., am42dl6402g Datasheet - Page 56

• Manufacturer Part Number: am42dl6402g
• Description: 64 Mbit 8m X8bit/4m X16bit Flash Memory And Sram Preliminary
• Manufacturer: Meet Spansion Inc.

SRAM CHARACTERISTICS
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.
January 31, 2003
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
Parameter
Symbol
is measured from the address valid to the beginning of write.
Address
CS1#s
CS2s
UB#s, LB#s
WE#
Data In
Data Out
is measured from CE1#s going low to the end of write.
is measured from the end of write to the address change. t
t
t
t
t
t
t
t
t
WHZ
t
t
t
OW
WC
CW
AW
BW
WP
WR
DW
AS
DH
(See Note 6)
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 9)
Figure 31. 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)
t
AS
P R E L I M I N A R Y
Am42DL6402G
t
WHZ
Max
(See Note 2)
(See Note 2)
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
WR
t
AW
t
(See Note 5)
WC
t
applied in case a write ends as CE1#s or WE# going high.
t
t
CW
BW
CW
t
WP
t
DW
Data Valid
70
70
60
60
60
50
20
30
WP
t
is measured from the beginning of write
WR
Speed
t
DH
0
0
0
0
5
t
(See Note 3)
OW
85
85
70
70
70
60
25
35
High-Z
(See Note 9)
(See Note 7)
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
55