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): 31/96頁
文件大?。?/td> 1517K
代理商: ΜPD4811650
31
μ
PD4811650 for Rev. E
Preliminary Data Sheet
11. Auto Precharge
During a read or write/block write command cycle, A9 controls whether auto precharge is selected. A9 high in the
read or write/block write command (Read with Auto precharge command or Write with Auto precharge
command/Block Write with Auto precharge command), auto precharge is selected and begins after the burst access
automatically.
The t
RAS
must be satisfied with a read with auto precharge or a write/ block write with auto precharge operation. In
addition, the next activate command to the bank being precharged cannot be executed until the precharge cycle
ends.
In read cycle, once auto precharge has started, an activate command to the bank can be issued after t
RP
has been
satisfied.
In write cycle, the t
DAL
, t
BAL
must be satisfied to issue the next activate command to the bank being precharged.
The timing that begins the auto precharge cycle depends on both the /CAS latency programmed into the mode
register and whether read or write/block write cycle.
11.1 Read with Auto Precharge
During a read cycle, the auto precharge begins one clock earlier (/CAS latency of 2) or two clocks earlier (/CAS
latency of 3) the last data word output.
QB1
QB2
QB3
QB4
Auto precharge starts
READA B
Hi-Z
QB1
QB2
QB3
QB4
Auto precharge starts
READA B
Hi-Z
DQ
Command
DQ
Command
/CAS latency = 2
/CAS latency = 3
CLK
T0
T2
T1
T3
T4
T5
T6
T7
T8
Burst length = 4
(t
RAS
is satisfied)
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