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46DR81280A Datasheet(PDF) 8 Page - Integrated Silicon Solution, Inc

Part # 46DR81280A
Description  Clock frequency up to 400MHz
Download  28 Pages
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Manufacturer  ISSI [Integrated Silicon Solution, Inc]
Direct Link  http://www.issi.com
Logo ISSI - Integrated Silicon Solution, Inc

46DR81280A Datasheet(HTML) 8 Page - Integrated Silicon Solution, Inc

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IS43/46DR81280A, IS43/46DR16640A  
Integrated Silicon Solution, Inc. – www.issi.com –
8
Rev. D, 08/30/2011
Extended Mode Register 2 (EMR[2]) Diagram  
Address
Field
Mode
Register
BA2
0
BA1
1
BA0
0
A13
(1)
0
A7
0
1
A2
A1
A0
BA[2:0]
0
0
0
All combinations
0
0
1
000, 001, 010, 011
0
1
0
000, 001
0
1
1
000
1
0
0
010, 011, 100, 101, 110, 111
1
0
1
100, 101, 110, 111
1
1
0
110, 111
1
1
1
111
A2
PASR
(3)
Quarter Array
1/8 array
A1
3/4 array
Half array
A0
Quarter array
1/8 array
A4
(1)
0
Partial Array Self Refresh for 8
Banks
A3
(1)
0
Full Array
Half Array
A6
(1)
0
A5
(1)
0
A8
(1)
0
High Temperature Self-Refresh Rate Enable
A7
SRFt
Disable
Enable
(2)
A10
(1)
0
A9
(1)
0
A12
(1)
0
A11
(1)
0
 
Notes: 
1.
A3‐A6, and A8‐A13 are reserved for future use and must be set to 0 when programming the EMR[2]. 
2.
Only Industrial and Automotive grade devices support the high temperature Self‐Refresh Mode. The controller can set the EMR (2) [A7] bit to enable this self‐
refresh rate if Tc > 85°C while in self‐refresh operation. TOPER may not be violated. 
3.
If PASR (Partial Array Self Refresh) is enabled, data located in areas of the array beyond the specified address range will be lost if self refresh is entered. Data 
integrity will be maintained if tREF conditions are met and no Self Refresh command is issued. 
DDR2 Extended Mode Register 3 (EMR[3]) Setting 
No function is defined in extended mode register 3. The default value of the extended mode register 3 is not defined. Therefore, the 
extended mode register 3 must be programmed during initialization for proper operation. 
DDR2 Extended Mode Register 3 (EMR[3]) Diagram 
BA2
BA1
BA0
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0*
1
1
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
Address Field
Mode Register
Note: All bits in EMR[3] except BA0 and BA1 are reserved for future use and must be set to 0 when programming the EMR[3].  


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