ESMT
EXTENDED MODE REGISTER SET (EMRS)
M52S128168A
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
1
0
0
0
A9
0
A8 A7
0
0
A6
A5 A4
DS
0
A3
0
A2 A1 A0
PASR
Address bus
Extended Mode Register Set
A2-A0
000
001
PASR
010
011
100
101
111
Self Refresh Coverage
4Bank
2 Bank (BankA& BankB) or
(BA1=0)
1 Bank (BankA) or
(BA0=BA1=0)
R
R
R
R
DS
A6-A5
00
01
10
11
Driver Strength
Full Strength
1/2 Strength
1/4 Strength
R
Remark R : Reserved
Internal Temperature Compensated Self Refresh (TCSR)
Note :
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.
2. If the EMRS for external TCSR is issued by the controller, this EMRS code for TCSR is ignored.
3. It has +/-5°C tolerance
Elite Semiconductor Memory Technology Inc.
Publication Date: Dec. 2008
Revision: 1.2
9/47
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
