參數(shù)資料
型號(hào): μPD45D128164
廠商: NEC Corp.
英文描述: 128 M-bit Synchronous DRAM with Double Data Rate(128 同步動(dòng)態(tài)RAM)
中文描述: 128 M位同步雙數(shù)據(jù)速率(128同步動(dòng)態(tài)RAM的內(nèi)存)
文件頁(yè)數(shù): 21/80頁(yè)
文件大?。?/td> 637K
代理商: ΜPD45D128164
21
μ
PD45D128442, 45D128842, 45D128164
Preliminary Data Sheet
5. Initialization
The
μ
PD45D128xxx is initialized in the power-on sequence according to the following.
(1) To stabilize internal circuits, when power is applied, a 100
μ
s or longer pause must precede any signal toggling.
(2) After the pause, EMRS and MRS command must be performed to enable or disable DLL and reset DLL. The
additional 200 cycles of clock input is required to lock the DLL and all banks must be precharged using the
precharge command.
In this case, PALL command is convenient.
(3) After the precharge, the mode register can be programmed by MRS command.
(4) Two or more REF command must be performed after or before MRS command.
Case 1 : MRS after the REF
CLK
Command
REF
MRS
t
RP
t
RSC
t
RC
t
RC
PALL
REF
Any
Command
t
RSC
enablDLL
DLL reset
CKE
Min. 200 cycles
t
RSC
MRS
EMRS
Minimum of 2 times REF command must be performed.
Remark
CKE may be held low and CLK may be run until 1 cycle before EMRS command is asserted to ensure
data-bus Hi-Z.
相關(guān)PDF資料
PDF描述
μPD45D128442 128 M-bit Synchronous DRAM with Double Data Rate(128 同步動(dòng)態(tài)RAM)
μPD45D128842 128 M-bit Synchronous DRAM with Double Data Rate(128 同步動(dòng)態(tài)RAM)
μPD4811650 16M Synchronous Graphics Memory (SGRAM)(16M同步圖形存儲(chǔ)器)
μPD703002 16/32 Bit Single Chip Microcontrollers(16/32 位單片微控制器)
μPD703003 16/32 Bit Single Chip Microcontrollers(16/32位單片微控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PD45VN6C100 制造商:Banner Engineering 功能描述:SENSOR, PHOTOELECTRIC, PICODOT, CONVERGENT LASER, FOCAL POINT, 1
PD45VN6C100Q 制造商:Banner Engineering 功能描述:Sensor, PicoDot, Convergent Laser, Focal Point: 102mm, Input 10-30VDC, Cable 2m
PD45VN6C200 制造商:Banner Engineering 功能描述:PicoDot: Convergent Laser, Focal Point: 203 mm, Input: 10-30V dc, Outputs: Compl
PD45VN6C200-52277 制造商:Banner Engineering 功能描述:PD45VN6C200-52277 CVGNT LASER 650nm/10nm BANDPASS FILTER
PD45VN6C200Q 制造商:Banner Engineering 功能描述:SENSOR, PHOTOELECTRIC, PICODOT, CONVERGENT LASER, FOCAL POINT