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EDS2516APTA-7AL 参数 Datasheet PDF下载

EDS2516APTA-7AL图片预览
型号: EDS2516APTA-7AL
PDF下载: 下载PDF文件 查看货源
内容描述: 256M位的SDRAM [256M bits SDRAM]
分类和应用: 动态存储器
文件页数/大小: 51 页 / 553 K
品牌: ELPIDA [ ELPIDA MEMORY ]
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EDS2504ACTA/08ACTA/16ACTA, EDS2504APTA/08APTA/16APTA  
Clock suspend mode entry  
The SDRAM enters clock suspend mode from active mode by setting CKE to Low. If command is input in the clock  
suspend mode entry cycle, the command is valid. The clock suspend mode changes depending on the current  
status (1 clock before) as shown below.  
ACTIVE clock suspend  
This suspend mode ignores inputs after the next clock by internally maintaining the bank active status.  
READ suspend and READ with Auto-precharge suspend  
The data being output is held (and continues to be output).  
WRITE suspend and WRIT with Auto-precharge suspend  
In this mode, external signals are not accepted. However, the internal state is held.  
Clock suspend  
During clock suspend mode, keep the CKE to Low.  
Clock suspend mode exit  
The SDRAM exits from clock suspend mode by setting CKE to High during the clock suspend state.  
IDLE  
In this state, all banks are not selected, and completed precharge operation.  
Auto-refresh command [REF]  
When this command is input from the IDLE state, the SDRAM starts auto-refresh operation. (The auto-refresh is the  
same as the CBR refresh of conventional DRAMs.) During the auto-refresh operation, refresh address and bank  
select address are generated inside the SDRAM. For every auto-refresh cycle, the internal address counter is  
updated. Accordingly, 8192 times are required to refresh the entire memory. Before executing the auto-refresh  
command, all the banks must be in the IDLE state. In addition, since the precharge for all banks is automatically  
performed after auto-refresh, no precharge command is required after auto-refresh.  
Self-refresh entry [SELF]  
When this command is input during the IDLE state, the SDRAM starts self-refresh operation. After the execution of  
this command, self-refresh continues while CKE is Low. Since self-refresh is performed internally and automatically,  
external refresh operations are unnecessary.  
Power down mode entry  
When this command is executed during the IDLE state, the SDRAM enters power down mode. In power down  
mode, power consumption is suppressed by cutting off the initial input circuit.  
Self-refresh exit  
When this command is executed during self-refresh mode, the SDRAM can exit from self-refresh mode. After exiting  
from self-refresh mode, the SDRAM enters the IDLE state.  
Power down exit  
When this command is executed at the power down mode, the SDRAM can exit from power down mode. After  
exiting from power down mode, the SDRAM enters the IDLE state.  
Data Sheet E0110E30 (Ver. 3.0)  
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