tc59lm818dmgi-37 TOSHIBA Semiconductor CORPORATION, tc59lm818dmgi-37 Datasheet - Page 46

• Manufacturer Part Number: tc59lm818dmgi-37
• Description: 288mbits Network Fcram2 I-version
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Bank, Address
Bank, Address
AUTO-REFRESH TIMING (CL = 4, BL = 4)
Command
Command
Unidirectional DS/QS mode
Unidirectional DS/Free Running QS mode
(output)
(output)
(output)
(output)
CLK
CLK
CLK
CLK
CLK
QS
DQ
QS
DQ
Note: In case of CL = 4, I
WRA REF
Hi-Z
Hi-Z
Low
I
Bank,
Bank,
I
RDA
RCD
RDA
RCD
UA
UA
When the Auto-Refresh operation is performed, the synthetic average interval of Auto-Refresh command
specified by t
t
t
than Read / Write operation.
REFI
REFI
0
= 1 cycle
= 1 cycle
t
is average interval time in 8 Refresh cycles that is sampled randomly.
is specified to avoid partly concentrated current of Refresh operation that is activated larger area
1
t
REFI
LAL
LAL
LA
LA
1
WRA REF
=
REFI
Total time of 8 Refresh cycle
I
I
RC
RC
must be satisfied.
2
REFC
I
RAS
= 5 cycles
= 5 cycles
I
RAS
t
CL = 4
CL = 4
2
= 4 cycles
must be meet 19 clock cycles.
DESL
DESL
= 4 cycles
3
8
WRA REF
8 Refresh cycle
4
t
3
WRA
I
WRA
I
RCD
RCD
5
=
Q0 Q1
Q0 Q1 Q2 Q3
t
= 1 cycle
= 1 cycle
1
+ t
REF
REF
2
6
+ t
Q2
3
+ t
Q3
4
t
7
8
+ t
7
I
I
REFC
REFC
WRA REF
5
+ t
6
n − 1
TC59LM818DMGI-37
= 19 cycles
= 19 cycles
+ t
DESL
DESL
7
+ t
t
8
Low
Hi-Z
Hi-Z
8
2005-11-08 46/55
n
WRA REF
n + 1
WRA
WRA
RDA
RDA
or
or
Rev 1.2
MRS or
MRS or
LAL or
LAL or
n + 2
REF
REF