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KM416L8031BT-GL0 View Datasheet(PDF) - Samsung

Part Name
Description
MFG CO.
KM416L8031BT-GL0
Samsung
Samsung Samsung
KM416L8031BT-GL0 Datasheet PDF : 53 Pages
128Mb DDR SDRAM
3.2 Basic Functionality
3.2.1 Power-Up and Initialization Sequence
The following sequence is required for POWER UP and Initialization.
1. Apply power and attempt to maintain CKE at a low state(all other inputs may be undefined.)
- Apply VDD before or at the same time as VDDQ.
- Apply VDDQ before or at the same time as VTT & Vref.
2. Start clock and maintain stable condition for a minimum of 200us.
3. The minimum of 200us after stable power and clock(CK, CK), apply NOP & take CKE high.
4. Issue precharge commands for all banks of the device.
*1 5. Issue EMRS to enable DLL.(To issue "DLL Enable" command, provide "Low" to A0, "High" to BA0 and "Low"
to all of the rest address pins, A1~A11 and BA1)
*1 6. Issue a mode register set command for "DLL reset". The additional 200 cycles of clock input is required to
lock the DLL.
(To issue DLL reset command, provide "High" to A8 and "Low" to BA0)
*2 7. Issue precharge commands for all banks of the device.
8. Issue 2 or more auto-refresh commands.
9. Issue a mode register set command with low to A8 to initialize device operation.
*1 Every "DLL enable" command resets DLL. Therefore sequence 6 can be skipped during power up.
Instead of it, the additional 200 cycles of clock input is required to lock the DLL after enabling DLL.
*2 Sequence of 6 & 7 is regardless of the order.
Power up & Initialization Sequence
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
CK
CK
tRP
Command
precharge
ALL Banks
2 Clock min. 2 Clock min.
tRP
EMRS
MRS
DLL Reset
precharge
ALL Banks
1st Auto
Refresh
tRFC
2nd Auto
Refresh
tRFC
2 Clock min.
Mode
Register Set
Any
Command
min.200 Cycle
Figure 4. Power up and initialization sequence
- 14 -
REV. 1.0 November. 2. 2000
 

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