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IC42S16800D-7TL 参数 Datasheet PDF下载

IC42S16800D-7TL图片预览
型号: IC42S16800D-7TL
PDF下载: 下载PDF文件 查看货源
内容描述: 16兆×8 , 8Meg X16 128兆位同步DRAM [16Meg x 8, 8Meg x16 128-MBIT SYNCHRONOUS DRAM]
分类和应用: 存储内存集成电路光电二极管动态存储器时钟
文件页数/大小: 62 页 / 530 K
品牌: ISSI [ INTEGRATED SILICON SOLUTION, INC ]
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IS42S81600D, IS42S16800D  
ACTIVATING SPECIFIC ROW WITHIN SPE-  
CIFIC BANK  
CHIP OPERATION  
BANK/ROW ACTIVATION  
BeforeanyREADorWRITEcommandscanbeissuedtoa  
bankwithintheSDRAM,arowinthatbankmustbe“opened.”  
This is accomplished via the ACTIVE command, which  
selects both the bank and the row to be activated (see  
Activating Specific Row Within Specific Bank).  
CLK  
HIGH  
CKE  
CS  
After opening a row (issuing an ACTIVE command), a  
READ or WRITE command may be issued to that row,  
subject to the tRCD specification. Minimum tRCD should be  
dividedbytheclockperiodandroundeduptothenextwhole  
number to determine the earliest clock edge after the  
ACTIVE command on which a READ or WRITE command  
can be entered. For example, a tRCD specification of 18ns  
with a 125 MHz clock (8ns period) results in 2.25 clocks,  
rounded to 3. This is reflected in the following example,  
which covers any case where 2 < [tRCD (MIN)/tCK] 3. (The  
sameprocedureisusedtoconvertotherspecificationlimits  
from time units to clock cycles).  
RAS  
CAS  
WE  
A0-A11  
BA0, BA1  
ROW ADDRESS  
BANK ADDRESS  
A subsequent ACTIVE command to a different row in the  
samebankcanonlybeissuedafterthepreviousactiverow  
hasbeenclosed(precharged).Theminimumtimeinterval  
betweensuccessiveACTIVEcommandstothesamebank  
is defined by tRC.  
A subsequent ACTIVE command to another bank can be  
issuedwhilethefirstbankisbeingaccessed, whichresults  
in a reduction of total row-access overhead. The minimum  
time interval between successive ACTIVE commands to  
different banks is defined by tRRD.  
EXAMPLE: MEETING TRCD (MIN) WHEN 2 < [TRCD (MIN)/TCK] 3  
T0  
T1  
T2  
T3  
T4  
CLK  
READ or  
WRITE  
ACTIVE  
NOP  
NOP  
COMMAND  
tRCD  
DON'T CARE  
Integrated Silicon Solution, Inc. — www.issi.com  
27  
Rev. E  
07/28/08  
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