- 您現在的位置：買賣IC網 > PDF目錄361234 > Q67100-Q1152 (SIEMENS AG) 2M x 8 - Bit Dynamic RAM 2k Refresh PDF資料下載
參數資料
| 型號： | Q67100-Q1152 |
| 廠商： | SIEMENS AG |
| 英文描述： | 2M x 8 - Bit Dynamic RAM 2k Refresh |
| 中文描述： | 200萬× 8 -位動態隨機存儲器2k刷新 |
| 文件頁數： | 11/53頁 |
| 文件大小： | 418K |
| 代理商： | Q67100-Q1152 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁當前第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁
HYB 39S64400/800/160BT(L)
64-MBit Synchronous DRAM
Data Book
11
12.99
Power On and Initialization
The default power on state of the mode register is supplier specific and may be undefined. The
following power on and initialization sequence guarantees the device is preconditioned to each
users specific needs. Like a conventional DRAM, the Synchronous DRAM must be powered up and
initialized in a predefined manner.During power on, all
V
DD
and
V
DDQ
pins must be built up
simultaneously to the specified voltage when the input signals are held in the “NOP” state. The
power on voltage must not exceed
V
DD
+ 0.3 V on any of the input pins or
V
DD
supplies. The CLK
signal must be started at the same time. After power on, an initial pause of 200
μ
s is required
followed by a precharge of both banks using the precharge command. To prevent data contention
on the DQ bus during power on, it is required that the DQM and CKE pins be held high during the
initial pause period. Once all banks have been precharged, the Mode Register Set Command must
be issued to initialize the Mode Register. A minimum of eight Auto Refresh cycles (CBR) are also
required.These may be done before or after programming the Mode Register. Failure to follow these
steps may lead to unpredictable start-up modes.
Programming the Mode Register
The Mode register designates the operation mode at the read or write cycle. This register is divided
into 4 fields. A Burst Length Field to set the length of the burst, an Addressing Selection bit to
program the column access sequence in a burst cycle (interleaved or sequential), a CAS Latency
Field to set the access time at clock cycle and a Operation mode field to differentiate between
normal operation (Burst read and burst Write) and a special Burst Read and Single Write mode. The
mode set operation must be done before any activate command after the initial power up. Any
content of the mode register can be altered by re-executing the mode set command. All banks must
be in precharged state and CKE must be high at least one clock before the mode set operation. After
the mode register is set, a Standby or NOP command is required. Low signals of RAS, CAS, and
WE at the positive edge of the clock activate the mode set operation. Address input data at this
timing defines parameters to be set as shown in the previous table.
Read and Write Operation
When RAS is low and both CAS and WE are high at the positive edge of the clock, a RAS cycle
starts. According to address data, a word line of the selected bank is activated and all of sense
amplifiers associated to the wordline are set. A CAS cycle is triggered by setting RAS high and CAS
low at a clock timing after a necessary delay,
t
RCD
, from the RAS timing. WE is used to define either
a read (WE = H) or a write (WE = L) at this stage.
SDRAM provides a wide variety of fast access modes. In a single CAS cycle, serial data read or
write operations are allowed at up to a 133 MHz data rate. The numbers of serial data bits are the
burst length programmed at the mode set operation, i.e., one of 1, 2, 4, 8 and full page, where full
page is an optional feature in this device. Column addresses are segmented by the burst length and
serial data accesses are done within this boundary. The first column address to be accessed is
supplied at the CAS timing and the subsequent addresses are generated automatically by the
programmed burst length and its sequence. For example, in a burst length of 8 with interleave
sequence, if the first address is ‘2’, then the rest of the burst sequence is 3, 0, 1, 6, 7, 4, and 5.
Full page burst operation is only possible using the sequential burst type and page length is a
function of the I/O organization and column addressing. Full page burst operation do not self
相關PDF資料 |
PDF描述 |
|---|---|
| Q67100-Q1184 | 3.3V 4M x 4-Bit EDO-Dynamic RAM |
| Q67100-Q1186 | 3.3V 4M x 4-Bit EDO-Dynamic RAM |
| Q67100-Q1331 | 16 MBit Synchronous DRAM |
| Q67100-Q1333 | 16 MBit Synchronous DRAM |
| Q67100-Q1335 | 16 MBit Synchronous DRAM |
相關代理商/技術參數 |
參數描述 |
|---|---|
| Q67100-Q1184 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:3.3V 4M x 4-Bit EDO-Dynamic RAM |
| Q67100-Q1186 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:3.3V 4M x 4-Bit EDO-Dynamic RAM |
| Q67100-Q1323 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16 MBit Synchronous DRAM |
| Q67100-Q1327 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16 MBit Synchronous DRAM |
| Q67100-Q1331 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16 MBit Synchronous DRAM |
發布緊急采購，3分鐘左右您將得到回復。