m52s128168a Elite Semiconductor Memory Technology Inc., m52s128168a Datasheet - Page 9

• Manufacturer Part Number: m52s128168a
• Description: 2m X 16 Bit X 4 Banks Synchronous Dram
• Manufacturer: Elite Semiconductor Memory Technology Inc.

ESMT
EXTENDED MODE REGISTER SET (EMRS)
The extended mode register stores for selecting PASR;DS. The extended mode register set must be done before any active
command after the power up sequence. The extended mode register is written by asserting low on CS,RAS,CAS,WE and high on
BA1,low on BA0(The SDRAM should be in all bank precharge with CKE already high prior to writing into the extended more
register). The state of address pins
A0~An in the same cycle as CS,RAS,CAS,WE going low is written in the extended mode register. Refer to the table for specific
codes.
The extended mode register can be changed by using the same command and clock cycle requirements during operations as long
as all banks are in the idle state. The default value extended mode register is defined as half driving strength and all banks
refreshed.
BA1 BA0 A11 A10
Internal Temperature Compensated Self Refresh (TCSR)
Note :
1.
2.
3.
Elite Semiconductor Memory Technology Inc.
1
In order to save power consumption, Mobile-DRAM includes the internal temperature sensor and control units to control the
self refresh cycle automatically according to the three temperature range : 15°C, 45°C and 70°C.
If the EMRS for external TCSR is issued by the controller, this EMRS code for TCSR is ignored.
It has +/-5°C tolerance
0
0
0
A9
0
A8 A7
0
0
A6
DS
A5 A4
0
A3
0
A2 A1 A0
PASR
DS
PASR
Address bus
Extended Mode Register Set
A2-A0
A6-A5
000
001
010
100
101
011
111
00
01
10
11
Publication Date: Dec. 2008
Revision: 1.2
2 Bank (BankA& BankB) or
Self Refresh Coverage
M52S128168A
1 Bank (BankA) or
Driver Strength
Remark R : Reserved
(BA0=BA1=0)
Full Strength
1/2 Strength
1/4 Strength
(BA1=0)
4Bank
R
R
R
R
R
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