K4M28163PD-R(B)G/S
Rev. 1.3 Dec. 2002
CMOS SDRAM
SIMPLIFIED TRUTH TABLE
(V=Valid, X=Don′t Care, H=Logic High, L=Logic Low)
Notes :
1. OP Code : Operand Code
A0 ~ A11 & BA0 ~ BA1 : 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 the same as CBR refresh of DRAM.
The automatical precharge without row precharge command is meant by "Auto".
Auto/self refresh can be issued only at all banks precharge state.
Partial self refresh can be issued only after setting partial self refresh mode.
4. BA0 ~ BA1 : Bank select addresses.
If both BA0 and BA1 are "Low" at read, write, row active and precharge, bank A is selected.
If BA0 is "Low" and BA1 is "High" at read, write, row active and precharge, bank B is selected.
If BA0 is "High" and BA1 is "Low" at read, write, row active and precharge, bank C is selected.
If both BA0 and BA1 are "High" at read, write, row active and precharge, bank D is selected.
If A10/AP is "High" at row precharge, BA0 and BA1 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 the positive going edge of CLK masks the data-in at that same CLK in write operation (Write DQM latency
is 0), but in read operation makes the data-out Hi-Z state after 2 CLK cycles. (Read DQM latency is 2).
COMMAND CKEn-1 CKEn CS RAS CAS WE DQM BA0,1 A10/AP A11,
A9 ~ A 0Note
Register Mode Register Set HXL L L L XOP CODE 1, 2
Refresh
Auto Refresh HHL L L HXX3
Self
Refresh
Entry L 3
Exit LHLHHHXX3
HX X X 3
Bank Active & Row Addr. HXL L HHX V Row Address
Read &
Column Address Auto Precharge Disable HXLHLHX V LColumn
Address
(A0~A8)
4
Auto Precharge Enable H4, 5
Write &
Column Address Auto Precharge Disable HXLHL L X V LColumn
Address
(A0~A8)
4
Auto Precharge Enable H4, 5
Burst Stop HXLHHLXX6
Precharge Bank Selection HXL L HLXVLX
All Banks XH
Clock Suspend or
Active Power Down Entry HLHX X X XXLV V V
Exit LHX X X X X
Precharge Power Down Mode
Entry HLHX X X X
X
LH H H
Exit LHHX X X X
LV V V
DQM HX VX7
No Operation Command HXHX X X X X
LH H H