t431616a TM Technology Inc., t431616a Datasheet - Page 28

• Manufacturer Part Number: t431616a
• Description: 1m X 16 Sdram - Taiwan Memory Technology
• Manufacturer: TM Technology Inc.

Self Refresh Entry & Exit Cycle
*Note : TO ENTER SELF REFRESH MODE
Taiwan Memory Technology, Inc. reserves the right P.28
to change products or specifications without notice.
tm
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
TE
S e l f R e f r e s h E n t r y
system uses burst refresh.
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
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.
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: DEC. 2000
1 5
A u t o R e f r e s h
* N o t e 7
1 6
1 7
T431616A
1 8
Revision: C
: D o n 't c a r e
1 9