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EM636165-XXI 参数 Datasheet PDF下载

EM636165-XXI图片预览
型号: EM636165-XXI
PDF下载: 下载PDF文件 查看货源
内容描述: 1Mega ×16同步DRAM (SDRAM)的 [1Mega x 16 Synchronous DRAM (SDRAM)]
分类和应用: 动态存储器
文件页数/大小: 73 页 / 756 K
品牌: ETRON [ ETRON TECHNOLOGY, INC. ]
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EtronTech  
EM636165-XXI  
14 Clock Suspend Mode Entry / PowerDown Mode Entry command (refer to Figures 6, 7, and 8 in  
Timing Waveforms)  
1M x 16 SDRAM  
(CKE = "L")  
When the SDRAM is operating the burst cycle, the internal CLK is suspended(masked) from  
the subsequent cycle by issuing this command (asserting CKE "LOW"). The device operation is held  
intact while CLK is suspended. On the other hand, when both banks are in the idle state, this  
command performs entry into the PowerDown mode. All input and output buffers (except the CKE  
buffer) are turned off in the PowerDown mode. The device may not remain in the Clock Suspend or  
PowerDown state longer than the refresh period (64ms) since the command does not perform any  
refresh operations.  
15 Clock Suspend Mode Exit / PowerDown Mode Exit command (refer to Figures 6, 7, and 8 in Timing  
Waveforms, CKE= "H")  
When the internal CLK has been suspended, the operation of the internal CLK is reinitiated  
from the subsequent cycle by providing this command (asserting CKE "HIGH"). When the device is  
in the PowerDown mode, the device exits this mode and all disabled buffers are turned on to the  
active state. tPDE(min.) is required when the device exits from the PowerDown mode. Any  
subsequent commands can be issued after one clock cycle from the end of this command.  
16 Data Write / Output Enable, Data Mask / Output Disable command (LDQM/UDQM = "L", "H")  
During a write cycle, the LDQM/UDQM signal functions as a Data Mask and can control every  
word of the input data. During a read cycle, the LDQM/UDQM functions as the controller of output  
buffers. LDQM/UDQM is also used for device selection, byte selection and bus control in a memory  
system. LDQM controls DQ0 to DQ7, UDQM controls DQ8 to DQ15.  
Preliminary  
16  
Rev. 1.1 Apr. 2005  
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