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CMS4A16LAF 参数 Datasheet PDF下载

CMS4A16LAF图片预览
型号: CMS4A16LAF
PDF下载: 下载PDF文件 查看货源
内容描述: 128M ( 8Mx16 )低功耗SDRAM [128M(8Mx16) Low Power SDRAM]
分类和应用: 动态存储器
文件页数/大小: 46 页 / 616 K
品牌: FIDELIX [ FIDELIX ]
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CMS4A16LAx–75Ex  
Table 2. Burst Length Definition.  
Burst Length  
Order of Accesses within a Burst  
Starting Column Address  
Type=Sequential  
Type=Interleaved  
A0  
2
4
0
0-1  
1-0  
0-1  
1-0  
1
A1 A0  
0 0  
0-1-2-3  
1-2-3-0  
2-3-0-1  
3-0-1-2  
0-1-2-3  
1-0-3-2  
2-3-0-1  
3-2-1-0  
0 1  
1 0  
1 1  
A2 A1 A0  
0 0 0  
0-1-2-3-4-5-6-7  
1-2-3-4-5-6-7-0  
0-1-2-3-4-5-6-7  
1-0-3-2-5-4-7-6  
2-3-0-1-6-7-4-5  
3-2-1-0-7-6-5-4  
4-5-6-7-0-1-2-3  
5-4-7-6-1-0-3-2  
6-7-4-5-2-3-0-1  
7-6-5-4-3-2-1-0  
Not supported  
0 0 1  
0 1 0  
2-3-4-5-6-7-0-1  
8
0 1 1  
3-4-5-6-7-0-1-2  
1 0 0  
4-5-6-7-0-1-2-3  
1 0 1  
1 1 0  
5-6-7-0-1-2-3-4  
6-7-0-1-2-3-4-5  
1 1 1  
7-0-1-2-3-4-5-6  
Full Page(y)  
n=A0-A8(location 0-y)  
Bn, Bn+1, Bn+2…..Bn,…  
For example, assuming that the clock cycle time is  
such that all relevant access times are met, if a READ  
command is registered at T0 and the latency is programmed  
to two clocks, the DQs will start driving after T1 and the data  
w i l l b e v a l i d b y T 2 , a s s h o w n i n F i g u r e 2 .  
Table 3 indicates the operating frequencies at which each CAS  
latency setting can be used. Reserved states should not be  
used as unknown operation or incompatibility with future  
versions may result.  
Operating Mode  
The normal operating mode is selected by setting M7 and M8  
to zero; the other combinations of values for M7 and M8 are  
reserved for future use and/or test modes.Test modes  
and reserved states should not be used because unknown  
operation or incompatibility with future versions may result.  
CAS Latency  
The CAS latency is the delay, in clock cycles, between the  
registration of a READ command and the availability of the  
first piece of output data. The latency can be set to one, two,  
or three clocks. If a READ command is registered at clock edge  
r, and the latency is q clocks, the data will be available by clock  
edge r + q. The DQs will start driving as a result of the clock  
edge one cycle earlier (r + q- 1), and provided that the relevant  
access times are met, the data will be valid by clock edge  
r + q.  
Write Burst Mode  
When M9=0, the burst length programmed via M0-M2 applies to  
both READ and WRITE bursts; when M9=1, the programmed  
burst length applies to READ bursts, but write accesses are  
single-location (non-burst) accesses.  
9
Rev. 0.5, May. ‘07