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AS4C16M16SA 参数 Datasheet PDF下载

AS4C16M16SA图片预览
型号: AS4C16M16SA
PDF下载: 下载PDF文件 查看货源
内容描述: [Fully synchronous operation]
分类和应用:
文件页数/大小: 54 页 / 1288 K
品牌: ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
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AS4C16M16SA  
T0  
T1  
T2  
T3  
T4  
T5  
T6  
T7  
T8  
T9  
CLK  
Bank A  
Activate  
Bank A  
Activate  
WRITE A  
Auto Precharge  
NOP  
NOP  
NOP  
NOP  
NOP  
NOP  
NOP  
COMMAND  
tDAL  
DIN A0  
DIN A1  
DQ  
tDAL=tWR+tRP  
Begin AutoPrecharge  
Bank can be reactivated at  
completion of tDAL  
Figure 14. Burst Write with Auto-Precharge  
(Burst Length = 2)  
8
Mode Register Set command (RAS# = "L", CAS# = "L", WE# = "L", A0-A12 = Register Data)  
The mode register stores the data for controlling the various operating modes of SDRAM. The Mode  
Register Set command programs the values of CAS latency, Addressing Mode and Burst Length in the  
Mode register to make SDRAM useful for a variety of different applications. The default values of the Mode  
Register after power-up are undefined; therefore this command must be issued at the power-up sequence.  
The state of pins A0~ A12 in the same cycle is the data written to the mode register. Two clock cycles are  
required to complete the write in the mode register (refer to the following figure). The contents of the mode  
register can be changed using the same command and the clock cycle requirements during operation as  
long as all banks are in the idle state.  
Table 5. Mode Register Bitmap  
BA1 BA0 A12 A11 A10 A9  
A8  
A7  
A6  
A5  
A4  
A3  
BT  
A2  
A1  
A0  
RFU* RFU* WBL Test Mode  
0
CAS Latency  
Burst Length  
A9 Write Burst Mode  
A8 A7  
Test Mode  
Normal  
Vendor Use Only  
Vendor Use Only  
A3  
0
1
Burst Type  
Sequential  
Interleave  
0
1
Burst  
Single Bit  
0
1
0
0
0
1
A6  
0
0
0
0
A5  
A4  
0
1
0
1
CAS Latency  
Reserved  
Reserved  
2 clocks  
3 clocks  
Reserved  
A2  
0
0
0
0
A1  
0
0
1
1
A0  
0
1
0
1
Burst Length  
0
0
1
1
0
1
2
4
8
1
0
1
1
1
Full Page (Sequential)  
All other Reserved  
All other Reserved  
*Note: RFU (Reserved for future use) should stay “0” during MRS cycle.  
Confidential  
12  
Rev. 2.0 63nm Mar /2014