參數(shù)資料
型號(hào)： W942508BH
英文描述： DRAM
中文描述： 內(nèi)存
文件頁(yè)數(shù)： 19/45頁(yè)
文件大?。?/td> 1601K
代理商： W942508BH
W942508BH
Publication Release Date: March 19, 2002
- 19 -
Revision A1
16. FUNCTIONAL DESCRIPTION
Power Up Sequence
(1) Apply power and attempt to CKE at a low state (
≤
0.2V), all other inputs may be undefined
1) Apply V
DD
before or at the same time as V
DDQ
.
2) Apply V
DDQ
before or at the same time as V
TT
and V
REF
.
(2) Start Clock and maintain stable condition for 200
μ
S (min.).
(3) After stable power and clock, apply NOP and take CKE high.
(4) Issue EMRS (Extended Mode Register Set) to enable DLL and establish Output Driver Type.
(5) Issue MRS (Mode Register Set) to reset DLL and set device to idle with bit A8.
(an additional 200 cycles(min) of clock are required for DLL Lock)
(6) Issue precharge command for all banks of the device.
(7) Issue two or more Auto Refresh commands.
(8) Issue MRS-Initialize device operation.
(If device operation mode is set at sequence 5, sequence 8 can be skipped.)
Command Function
1. Bank Activate Command
(RAS = "L", CAS = "H", WE = "H", BS0, BS1 = Bank, A0 to A12 = Row Address)
The Bank Activate command activates the bank designated by the BS (Bank address) signal. Row
addresses are latched on A0 to A12 when this command is issued and the cell data is read out of
the sense amplifiers. The maximum time that each bank can be held in the active state is specified
as t
RAS (max)
. After this command is issued, Read or Write operation can be executed.
2. Bank Precharge Command
(RAS = "L", CAS = "H", WE = "L", BS0, BS1 = Bank, A10 = "L", A0 to A9, A11, A12 = Don’t
care)
The Bank Precharge command percharges the bank designated by BS. The precharged bank is
switched from the active state to the idle state.
3. Precharge All Command
(RAS = "L", CAS = "H", WE = "L", BS0, BS1 = Don’t care, A10 = "H", A0 to A9, A11, A12 =
Don’t care)
The Precharge All command precharges all banks simultaneously. Then all banks are switched to
the idle state.
4. Write Command
(RAS = "H", CAS = "L", WE = "L", BS0, BS1 = Bank, A10 = "L", A0 to A9, A11 = Column
Address)
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