is43r16160 Integrated Silicon Solution, Inc., is43r16160 Datasheet - Page 13

• Manufacturer Part Number: is43r16160
• Description: 32mx8, 16mx16 256mb Synchronous Dram
• Manufacturer: Integrated Silicon Solution, Inc.

DDR SDRAM (Rev.1.1)
IS43R16160
Integrated Silicon Solution, Inc.
Rev. 00A
09/10/08
POWER ON SEQUENCE
SDRAM from damaged or multifunctioning.
1. Apply VDD before or the same time as VDDQ
2. Apply VDDQ before or at the same time as VTT & Vref
3. Maintain stable condition for 200us after stable power and CLK, apply NOP or DSEL
4. Issue precharge command for all banks of the device
5. Issue EMRS
6. Issue MRS for the Mode Register and to reset the DLL
7. Issue 2 or more Auto Refresh commands
8. Maintain stable condition for 200 cycle
After these sequence, the DDR SDRAM is idle state and ready for normal operation.
MODE REGISTER
programmed by setting the mode register (MRS). The mode
register stores these data until the next MRS command, which
may be issued when all banks are in idle state. After tMRD from a
MRS command, the DDR SDRAM is ready for new command.
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
0
Before starting normal operation, the following power on sequence is necessary to prevent a
Burst Length, Burst Type and /CAS Latency can be
DLL Reset
0
0
Latency
Mode
0
0
1
0
Preliminary
Preliminary
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
CL
0
DR
YES
NO
/CAS Latency
0
2.5
R
R
R
R
R
2
3
LTMODE
256M Double Data Rate Synchronous DRAM
BT
Length
Burst
Burst Type
BL
R: Reserved for Future Use
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
BL
A3S56D30/40ETP
A12-A0
CLK
/CLK
/CS
/RAS
/CAS
/WE
BA0
BA1
0
1
BT=0
R
R
R
R
R
2
4
8
Interleaved
Sequential
V
BT=1
R
R
R
R
R
2
4
8
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