SDRAM
AS4SD4M16
Austin Semiconductor, Inc.
CLOCK SUSPEND MODE1
T0
T1
T2
t
T3
T4
T5
T6
T7
T8
T9
t
CK
t
CL
CLK
CKE
t
CH
t
CKS CKH
t
t
CKH
CKS
t
t
CMS CMH
NOP
NOP
NOP
NOP
NOP
NOP
WRITE
COLUMN e2
BANK
COMMAND
READ
t
t
CMS CMH
DQM /
DQML,
DQMH
t
t
AS
AH
A0-A9,
A11
COLUMN m2
t
t
AS
AH
A10
t
t
AS
AH
BA0,
BA1
BANK
t
t
AC
OH
t
t
t
DS DH
HZ
AC
t
DOUT a
DOUT a-1
DOUT m
DOUTm+1
DQ
t
LZ
Don’t Care
Undefined
TIMING PARAMETERS
-8
-10
-8
-10
MIN
MAX
6.5
MIN
MAX
7
MIN
2
MAX
MIN
3
MAX
SYMBOL*
tAC(3)
UNITS
ns
SYMBOL*
tCKS
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
tAC(2)
tAH
tCMH
tCMS
tDH
9
9
ns
ns
ns
ns
ns
ns
ns
ns
1
2
1
2
1
3
1
3
1
2
1
3
tAS
tCH
tDS
3
3.5
3.5
10
15
1
tCL
tHZ(3)
tHZ(2)
tLZ
3
6
7
8
tCK(3)
tCK(2)
tCKH
8
10
12
1
1
tOH
1
2.5
2.5
* CAS latency indicated in parentheses.
NOTE: 1. For this example, the burst length = 2, the CAS latency = 3, and AUTO PRECHARGE is disabled.
2. x16: A8, A9 and A11 = “Don’t Care.”
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
AS4SD4M16
Rev. 1.5 10/01
36
AUSTIN [ AUSTIN SEMICONDUCTOR ]
