參數(shù)資料
型號: MT48LC4M32LFFC
廠商: Micron Technology, Inc.
英文描述: SYNCHRONOUS DRAM
中文描述: 同步DRAM
文件頁數(shù): 2/52頁
文件大?。?/td> 1281K
代理商: MT48LC4M32LFFC
2
128Mb: x32 SDRAM
128MbSDRAMx32_D.p65 – Rev. D; Pub. 6/02
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2002, Micron Technology, Inc.
128Mb: x32
SDRAM
The SDRAM provides for programmable READ or
WRITE burst lengths of 1, 2, 4, or 8 locations, or the full
page, with a burst terminate option. An auto precharge
function may be enabled to provide a self-timed row
precharge that is initiated at the end of the burst se-
quence.
The 128Mb SDRAM uses an internal pipelined ar-
chitecture to achieve high-speed operation. This ar-
chitecture is compatible with the 2
n
rule of prefetch
architectures, but it also allows the column address to
be changed on every clock cycle to achieve a high-
speed, fully random access. Precharging one bank
while accessing one of the other three banks will hide
the precharge cycles and provide seamless, high-
speed, random-access operation.
The 128Mb SDRAM is designed to operate in 3.3V,
low-power memory systems. An auto refresh mode is
provided, along with a power-saving, power-down
mode. All inputs and outputs are LVTTL-compatible.
SDRAMs offer substantial advances in DRAM oper-
ating performance, including the ability to synchro-
nously burst data at a high data rate with automatic
column-address generation, the ability to interleave
between internal banks to hide precharge time and
the capability to randomly change column addresses
on each clock cycle during a burst access.
GENERAL DESCRIPTION
The 128Mb SDRAM is a high-speed CMOS, dynamic
random-access memory containing 134,217,728-bits.
It is internally configured as a quad-bank DRAM with a
synchronous interface (all signals are registered on the
positive edge of the clock signal, CLK). Each of the
33,554,432-bit banks is organized as 4,096 rows by 256
columns by 32 bits.
Read and write accesses to the SDRAM are burst
oriented; accesses start at a selected location and con-
tinue for a programmed number of locations in a pro-
grammed sequence. Accesses begin with the registra-
tion of an ACTIVE command, which is then followed by
a READ or WRITE command. The address bits regis-
tered coincident with the ACTIVE command are used
to select the bank and row to be accessed (BA0, BA1
select the bank, A0–A11 select the row). The address
bits registered coincident with the READ or WRITE com-
mand are used to select the starting column location
for the burst access.
128Mb (x32) SDRAM PART NUMBER
PART NUMBER
MT48LC4M32B2TG
ARCHITECTURE
4 Meg x 32
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