參數(shù)資料
型號(hào)： IS42LS16800A-7T
英文描述： 16Meg x 8, 8Meg x16 & 4Meg x 32 128-MBIT SYNCHRONOUS DRAM
中文描述： 16Meg × 8，8Meg x16
文件頁(yè)數(shù)： 39/66頁(yè)
文件大?。?/td> 556K
代理商： IS42LS16800A-7T
ISSI
44
Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774
ADVANCEDINFORMATION
Rev. 00A
06/01/02
IS42S81600A, IS42S16800A, IS42S32400A
IS42LS81600A, IS42LS16800A, IS42LS32400A
CLK
CKE
HIGH
COLUMN ADDRESS
AUTO PRECHARGE
BANK ADDRESS
CS
RAS
CAS
WE
A0-A7
A10
BA0, BA1
NO PRECHARGE
A8,A9,A11
WRITE COMMAND
The starting column and bank addresses are provided with
the WRITE command, and auto precharge is either enabled
or disabled for that access. If auto precharge is enabled, the
row being accessed is precharged at the completion of the
burst. For the generic WRITE commands used in the
following illustrations, auto precharge is disabled.
During WRITE bursts, the first valid data-in element will be
registered coincident with the WRITE command. Subsequent
data elements will be registered on each successive positive
clock edge. Upon completion of a fixed-length burst, assum-
ing no other commands have been initiated, the DQs will
remain High-Z and any additional input data will be ignored
(see WRITE Burst). A full-page burst will continue until
terminated. (At the end of the page, it will wrap to column 0
and continue.)
Data for any WRITE burst may be truncated with a subse-
quent WRITE command, and data for a fixed-length WRITE
burst may be immediately followed by data for a WRITE
command. The new WRITE command can be issued on any
clock following the previous WRITE command, and the data
provided coincident with the new command applies to the new
command.
An example is shown in WRITE to WRITE diagram. Data n
+ 1 is either the last of a burst of two or the last desired of
a longer burst. The 128Mb SDRAM uses a pipelined
architecture and therefore does not require the 2n rule
associated with a prefetch architecture. A WRITE command
can be initiated on any clock cycle following a previous
WRITE command. Full-speed random write accesses within
a page can be performed to the same bank, as shown in
Random WRITE Cycles, or each subsequent WRITE may
be performed to a different bank.
Data for any WRITE burst may be truncated with a subse-
quent READ command, and data for a fixed-length WRITE
burst may be immediately followed by a subsequent READ
command. Once the READ com mand is registered, the
data inputs will be ignored, and WRITEs will not be ex-
ecuted. An example is shown in WRITE to READ. Data n +
1 is either the last of a burst of two or the last desired of a
longer burst.
Data for a fixed-length WRITE burst may be followed by, or
truncated with, a PRECHARGE command to the same bank
(provided that auto precharge was not activated), and a full-
page WRITE burst may be truncated with a PRECHARGE
command to the same bank. The PRECHARGE command
should be issued tWR after the clock edge at which the last
desired input data element is registered. The auto precharge
mode requires a tWR of at least one clock plus time,
regardless of frequency. In addition, when truncating a
WRITE burst, the DQM signal must be used to mask input
data for the clock edge prior to, and the clock edge coincident
with,thePRECHARGEcommand.Anexampleisshowninthe
WRITE to PRECHARGE diagram. Data n+1 is either the last
of a burst of two or the last desired of a longer burst. Following
the PRECHARGE command, a subsequent command to the
same bank cannot be issued until tRP is met.
In the case of a fixed-length burst being executed to comple-
tion,aPRECHARGEcommandissuedattheoptimumtime(as
describedabove) provides the same operation that would result
from the same fixed-length burst with auto precharge. The
disadvantage of the PRECHARGE command is that it requires
that the command and address buses be available at the
appropriate time to issue the command; the advantage of the
PRECHARGE command is that it can be used to truncate
fixed-length or full-page bursts.
Fixed-length or full-page WRITE bursts can be truncated
with the BURST TERMINATE command. When truncating
a WRITE burst, the input data applied coincident with the
BURST TERMINATE command will be ignored. The last
data written (provided that DQM is LOW at that time) will be
the input data applied one clock previous to the BURST
TERMINATE command. This is shown in WRITE Burst
Termination, where data n is the last desired data element
of a longer burst.
WRITES
WRITE bursts are initiated with a WRITE command, as
shown in WRITE Command diagram.
相關(guān)PDF資料
PDF描述
IS42LS16800A-7TI 16Meg x 8, 8Meg x16 & 4Meg x 32 128-MBIT SYNCHRONOUS DRAM
IC42S81600-7TI(G) 4(2)M x 8(16) Bits x 4 Banks (128-MBIT) SYNCHRONOUS DYNAMIC RAM
IC42S81600-8TI(G) 4(2)M x 8(16) Bits x 4 Banks (128-MBIT) SYNCHRONOUS DYNAMIC RAM
IC42S81600-8TIG 4(2)M x 8(16) Bits x 4 Banks (128-MBIT) SYNCHRONOUS DYNAMIC RAM
IC42S81600L-8TIG 4(2)M x 8(16) Bits x 4 Banks (128-MBIT) SYNCHRONOUS DYNAMIC RAM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IS42LS16800A-7TI 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:16Meg x 8, 8Meg x16 & 4Meg x 32 128-MBIT SYNCHRONOUS DRAM
IS42LS32400A 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:16Meg x 8, 8Meg x16 & 4Meg x 32 128-MBIT SYNCHRONOUS DRAM
IS42LS32400A-10B 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:16Meg x 8, 8Meg x16 & 4Meg x 32 128-MBIT SYNCHRONOUS DRAM
IS42LS32400A-10BI 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:16Meg x 8, 8Meg x16 & 4Meg x 32 128-MBIT SYNCHRONOUS DRAM
IS42LS32400A-10T 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:16Meg x 8, 8Meg x16 & 4Meg x 32 128-MBIT SYNCHRONOUS DRAM
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