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128Mb: x4, x8, x16 SDRAM
128MSDRAM_E.p65
–
Rev. E; Pub. 1/02
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2001, Micron Technology, Inc.
128Mb: x4, x8, x16
SDRAM
WRITE – WITHOUT AUTO PRECHARGE
1
DISABLE AUTO PRECHARGE
ALL BANKS
tCH
tCL
tCK
tRP
tRAS
tRC
tRCD
DQM /
DQML, DQMH
CKE
CLK
A0-A9, A11
DQ
BA0, BA1
A10
tCMH
tCMS
tAH
tAS
ROW
ROW
BANK
BANK
BANK
ROW
ROW
BANK
tWR
D
IN
m
tDH
tDS
D
IN
m
+ 1
D
IN
m
+ 2
D
IN
m
+ 3
COMMAND
tCMH
tCMS
NOP
NOP
NOP
ACTIVE
NOP
WRITE
NOP
PRECHARGE
ACTIVE
tAH
tAS
tAH
tAS
tDH
tDS
tDH
tDS
tDH
tDS
SINGLE BANK
tCKH
tCKS
COLUMN
m
3
2
T0
T1
T2
T4
T3
T5
T6
T7
T8
DON
’
T CARE
T9
NOP
NOTE:
1. For this example, the burst length = 4, and the WRITE burst is followed by a
“
manual
”
PRECHARGE.
2. 15ns is required between <D
IN
m
+ 3> and the PRECHARGE command, regardless of frequency.
3. x16: A9 and A11 =
“
Don
’
t Care
”
x8: A11 =
“
Don
’
t Care
”
*CAS latency indicated in parentheses.
-7E
-75
-8E
SYMBOL*
t
CMS
t
DH
t
DS
t
RAS
t
RC
t
RCD
t
RP
t
WR
MIN
1.5
0.8
1.5
37
60
15
15
14
MAX
MIN
1.5
0.8
1.5
44
66
20
20
15
MAX
MIN
2
1
2
50
70
20
20
15
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
120,000
120,000
120,000
TIMING PARAMETERS
-7E
-75
-8E
SYMBOL*
t
AH
t
AS
t
CH
t
CL
t
CK (3)
t
CK (2)
t
CKH
t
CKS
t
CMH
MIN
0.8
1.5
2.5
2.5
7
7.5
0.8
1.5
0.8
MAX
MIN
0.8
1.5
2.5
2.5
7.5
10
0.8
1.5
0.8
MAX
MIN
1
2
3
3
8
10
1
2
1
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns