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參數(shù)資料
| 型號(hào)： | K4D553235F-GC2A |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | 256M GDDR SDRAM |
| 中文描述： | 256M GDDR SDRAM內(nèi)存 |
| 文件頁數(shù)： | 7/18頁 |
| 文件大?。?/td> | 386K |
| 代理商： | K4D553235F-GC2A |
256M GDDR SDRAM
K4D553235F-GC
- 7 -
Rev 1.6 (May 2005)
Power-Up Sequence
DDR SDRAMs must be powered up and initialized in a predefined manner to prevent undefined operations.
1. Apply power and keep CKE at low state (All other inputs may be undefined)
- Apply VDD before VDDQ .
- Apply VDDQ before VREF & VTT
2. Start clock and maintain stable condition for minimum 200us.
3. The minimum of 200us after stable power and clock(CK,CK ), apply NOP and take CKE to be high .
4. Issue precharge command for all banks of the device.
5. Issue a EMRS command to enable DLL
*1
6. Issue a MRS command to reset DLL. The additional 200 clock cycles are required to lock the DLL.
*
1,2
7. Issue precharge command for all banks of the device.
8. Issue at least 2 or more auto-refresh commands.
9. Issue a mode register set command with A8 to low to initialize the mode register.
*1 The additional 200cycles of clock input is required to lock the DLL after enabling DLL.
*2 Sequence of 6&7 is regardless of the order
FUNCTIONAL DESCRIPTION
Power up & Initialization Sequence
Command
tRP
~
tMRD
~
precharge
ALL Banks
2nd Auto
Refresh
Mode
Register Set
CoAny
t
RFC
1st Auto
Refresh
t
RFC
~
EMRS
MRS
tMRD.
~
DLL Reset
precharge
ALL Banks
t
RP
Inputs must be
stable for 200us
~
200 Clock min.
tMRD
~
CK,CK
* When the operating frequency is changed, DLL reset should be required again.
After DLL reset again, the minimum 200 cycles of clock input is needed to lock the DLL.
~
~
~
~
~
~
~
~
~
~
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