參數(shù)資料
型號: μPD4811650
廠商: NEC Corp.
英文描述: 16M Synchronous Graphics Memory (SGRAM)(16M同步圖形存儲器)
中文描述: 1,600同步圖形存儲器(SGRAM)(1,600同步圖形存儲器)
文件頁數(shù): 30/96頁
文件大?。?/td> 1517K
代理商: ΜPD4811650
30
Preliminary Data Sheet
μ
PD4811650 for Rev. E
10. Precharge
The precharge command can be asserted anytime after t
RAS(MIN.)
is satisfied.
Soon after the precharge command is asserted, precharge operation performed and the synchronous GRAM enters
the idle state after t
RP
is satisfied. The parameter t
RP
is the time required to perform the precharge.
The earliest timing in a read cycle that a precharge command can be asserted without losing any data in the burst is
as follows.
/CAS latency = 2
/CAS latency = 3
: One clock earlier than the last read data.
: Two clocks earlier than the last read data.
T0
T1
T2
T3
T4
T5
T6
T7
Burst length=4
READ
READ
Q1
Q2
Q3
Q4
PRE
Hi-Z
Q1
Q2
Q3
Q4
PRE
Hi-Z
(t
RAS
is satisfied)
CLK
Command
/CAS latency = 2
DQ
Command
/CAS latency = 3
DQ
In order to write all data to the memory cell correctly, the asynchronous parameter “t
DPL
”, “t
BPL
” must be satisfied.
The t
DPL(MIN.)
, t
BPL(MIN.)
specification define the earliest time that a precharge command can be asserted. Minimum
number of clocks are calculated by dividing t
DPL (MIN.)
, t
BPL(MIN.)
with clock cycle time.
In summary, the precharge command can be asserted relative to reference clock that indicates the last data word is
valid. In the following table, minus means clocks before the reference; plus means time after the reference.
/CAS latency
Read
Write
Block Write
2
–1
+t
DPL(MIN.)
+t
BPL(MIN.)
3
–2
+t
DPL(MIN.)
+t
BPL(MIN.)
相關(guān)PDF資料
PDF描述
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)
μPD703100 32 Bit RISC Microcontrollers(32 位 RISC 微控制器)
μPD703101 32 Bit RISC Microcontrollers(32 位 RISC 微控制器)
μPD70F3102 32 Bit RISC Microcontrollers(32 位 RISC 微控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PD481PI 功能描述:PHOTODIODE BLACK 960NM SIDE RoHS:否 類別:傳感器,轉(zhuǎn)換器 >> 光學(xué) - 光電檢測器 - 光電二極管 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 波長:850nm 顏色 - 增強(qiáng)型:- 光譜范圍:400nm ~ 1100nm 二極管類型:引腳 nm 下響應(yīng)率:0.62 A/W @ 850nm 響應(yīng)時間:5ns 電壓 - (Vr)(最大):50V 電流 - 暗(標(biāo)準(zhǔn)):1nA 有效面積:1mm² 視角:150° 工作溫度:-40°C ~ 100°C 封裝/外殼:徑向,5mm 直徑(T 1 3/4) 其它名稱:475-2649-6
PD481PIE000F 功能描述:PHOTODIODE BLACK 960NM SIDE RoHS:是 類別:傳感器,轉(zhuǎn)換器 >> 光學(xué) - 光電檢測器 - 光電二極管 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 波長:850nm 顏色 - 增強(qiáng)型:- 光譜范圍:400nm ~ 1100nm 二極管類型:引腳 nm 下響應(yīng)率:0.62 A/W @ 850nm 響應(yīng)時間:5ns 電壓 - (Vr)(最大):50V 電流 - 暗(標(biāo)準(zhǔn)):1nA 有效面積:1mm² 視角:150° 工作溫度:-40°C ~ 100°C 封裝/外殼:徑向,5mm 直徑(T 1 3/4) 其它名稱:475-2649-6
PD4859J5050S2 制造商:Anaren Microwave 功能描述:LOW PFOFILE 0805 POWER DIVIDER 50 50 OHM
PD4859J5050S2HF 功能描述:信號調(diào)節(jié) 4.8-5.9GHz 50 Ohm IL=1.0dB RoHS:否 制造商:EPCOS 產(chǎn)品:Duplexers 頻率:782 MHz, 751 MHz 頻率范圍: 電壓額定值: 帶寬: 阻抗:50 Ohms 端接類型:SMD/SMT 封裝 / 箱體:2.5 mm x 2 mm 工作溫度范圍:- 30 C to + 85 C 封裝:Reel
PD488588 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:288M bits Direct Rambus DRAM