Harman Kardon DVD 27 Service Manual page 57

DVD27
ESMT
SIMPLIFIED TRUTH TABLE
COMMAND
Register Mode Register set
Auto Refresh
Refresh
Self
Refresh
Bank Active & Row Addr.
Auto Precharge Disable
Read &
Column Address Auto Precharge Enable
Auto Precharge Disable
Write &
Column Address Auto Precharge Enable
Burst Stop
Bank Selection
Precharge
All Banks
Clock Suspend or
Active Power Down
Precharge Power Down Mode
DQM
No Operating Command
Note : 1.OP Code : Operating Code
A0~A11 & A13~A12 : Program keys. (@ MRS)
2.MRS can be issued only at all banks precharge state.
A new command can be issued after 2 CLK cycles of MRS.
3.Auto refresh functions are as same as CBR refresh of DRAM.
The automatical precharge without row precharge of command is meant by "Auto".
Auto/self refresh can be issued only at all banks precharge state.
4.A13~A12 : Bank select addresses.
If both A13 and A12 are "Low" at read ,write , row active and precharge ,bank A is selected.
If both A13 is "Low" and A12 is "High" at read ,write , row active and precharge ,bank B is selected.
If both A13 is "High" and A12 is "Low" at read ,write , row active and precharge ,bank C is selected.
If both A13 and A12 are "High" at read ,write , row active and precharge ,bank D is selected
If A10/AP is "High" at row precharge , A13 and A12 is ignored and all banks are selected.
5.During burst read or write with auto precharge. new read/write command can not be issued.
Another bank read/write command can be issued after the end of burst.
New row active of the associated bank can be issued at tRP after the end of burst.
6.Burst stop command is valid at every burst length.
7.DQM sampled at positive going edge of a CLK and masks the data-in at the very CLK (write DQM latency is 0), but
makes Hi-Z state the data-out of 2 CLK cycles after.(Read DQM latency is 2)
Elite Semiconductor Memory Technology Inc.
CKEn-1 CKEn
H X
H
H
Entry L
Exit L H
H X
H X
H X
H X
H X
Entry H L
Exit L H
Entry H L
Exit L H
H
H X
(V = Valid , X = Don't Care. H = Logic High , L = Logic Low )
CS RAS CAS WE
L L L L
L L L H
L H H H
H X X X
L L H H
L H L H
L H L L
L H H L
L L H L
H X X X
L V V V
X X X X
H X X X
L H H H
H X X X
L V V V
X
H X X X
L H H H
57
harman/kardon
M12L64164A
A11
DQM A13
A10/AP
A9~A0
A12
X OP CODE
X X
X
X
X
X V Row Address
L Column
X V Address
H
(A0~A7)
L Column
X V Address
H
(A0~A7)
X X
V L
X X
X H
X
X
X
X
X
X
V X
X X
Publication Date: Mar. 2003
Revision: 1.7
Note
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3
3
3
3
4
4,5
4
4,5
6
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