sg25672rddr6h2bgic ETC-unknow, sg25672rddr6h2bgic Datasheet - Page 13

• Manufacturer Part Number: sg25672rddr6h2bgic
• Description: Dram Module Ddr Sdram 2gbyte 184rdimm
• Manufacturer: ETC-unknow

Commands
The following Truth Tables provide a general reference of available commands. For a more detailed description please refer to
the device data sheets.
Truth Table - Commands
Truth Table - DM Operation (Note 10)
Note:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Used to mask write date; DM should be asserted in the same cycle as DQ that needs to be masked.
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Name (Function)
Deselect (NOP)
No Operation (NOP)
Active (Select bank and activate Row)
Read (Select bank and column and start Read burst)
Write (Select bank and column and start Write burst)
Burst Terminate
Precharge (Deactivate Row in bank or banks)
Auto Refresh or Self Refresh
(Enter Self Refresh Mode)
Load Mode Register
Name (Function)
Write Enable
Write Inhibit
CKE is HIGH for all commands shown except SELF REFRESH.
BA0-BA1 select either the Mode Register or the Extended Mode Register (BA0 = 0, BA1 = 0 selects the Mode Register;
BA0 = 1, BA1 = 0 selects the Extended Mode Register; other combinations of BA0-BA1 are reserved; A0-An provide the
op-code to be written to the selected Mode Register).
BA0-BA1 provide bank address and A0-An provide row address.
BA0-BA1 provide bank address; A0-Ai provide column address; A10 HIGH enables the autoprecharge feature (nonpersis-
tent), A10 LOW disables the auto precharge feature.
A10 LOW: BA0-BA1 determine which bank is precharged. A10 HIGH: all banks are precharged and BA0-BA1 are “Don’t
Care.”
This command is AUTO REFRESH if CKE is HIGH; SELF REFRESH if CKE is LOW.
Internal refresh counter controls row addressing; all inputs and I/Os are “Don’t Care” except for CKE.
Applies only to read bursts with autoprecharge disabled; this command is undefined (and should not be used) for read
bursts with autoprecharge enabled, and for write bursts.
DESELECT and NOP are functionally interchangeable.
DM
H
L
DQS
Valid
X
CS#
H
L
L
L
L
L
L
L
L
RAS#
SG25672RDDR6H2BGUU
H
H
H
X
H
L
L
L
L
CAS#
H
X
H
H
H
L
L
L
L
WE#
H
H
X
H
H
L
L
L
L
Bank/Row
Bank/Col
Bank/Col
Op-Code
ADDR
Code
X
X
X
X
July 5, 2007
Notes
9
9
3
4
4
8
5
6, 7
2
13