T4312816A Taiwan Memory Technology, T4312816A Datasheet - Page 27

• Manufacturer Part Number: T4312816A
• Description: 8M x 16 SDRAM
• Manufacturer: Taiwan Memory Technology

tm
Self Refresh Entry & Exit Cycle
*Note : TO ENTER SELF REFRESH MODE
TM Technology Inc. reserves the right
to change products or specifications without notice.
C L O C K
A 1 0 / A P
A D D R
C K E
R A S
C A S
D Q M
C S
B A
D Q
W E
TO EXIT SELF REFRESH MODE
0
1. CS , RAS & CAS with CKE should be low at the same clock cycle.
2. After 1 clock cycle, all the inputs inculding the system clock can be don’t care except for CKE.
3. The device remains in self refresh mode as long as CKE stays ‘Low’.
4. System clock restart and be stable before returning CKE high.
5. CS starts from high.
6. Minimum tRC is required after CKE going high to complete self refresh exit.
7. 2K cycle of burst auto refresh is required before self refresh entry and after self refresh exit if the
Cf.) Once the device enters self refresh mode, minimum
CH
S e l f R e f r e s h E n t r y
system uses burst refresh.
TE
1
* N o t e 1
t
S S
2
H i - z
* N o t e 2
3
4
5
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
6
* N o t e 3
7
8
9
P.27
1 0
* N o t e 4
H i - z
S e l f R e f r e s h E x i t
1 1
t
* N o t e 5
RAS
1 2
is required before exit from self refresh.
Preliminary T4312816A
1 3
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
S S
t
R C m i n
1 4
* N o t e 6
Publication Date: APR. 2003
1 5
A u t o R e f r e s h
* N o t e 7
1 6
1 7
1 8
Revision: 0.B
: D o n 't c a r e
1 9