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参数资料
| 型号： | MT48LC2M32LFFC |
| 厂商： | Micron Technology, Inc. |
| 英文描述： | 512K x 32 x 4 banks 3.3v SDRAM(3.3V,512K x 32 x 4组同步动态RAM) |
| 中文描述： | 为512k × 32 × 4银行3.3V的内存电压（3.3V，512K采样× 32 × 4组同步动态RAM）的 |
| 文件页数： | 6/50页 |
| 文件大小： | 1054K |
| 代理商： | MT48LC2M32LFFC |
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64Mb: x32, 3.3V SDRAM
BatRam_3V.p65 – Rev. 0.7, Pub. 2/01
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2001, Micron Technology, Inc.
64Mb: x32, 3.3V
SDRAM
PRELIMINARY
FUNCTIONAL DESCRIPTION
In general, this 64Mb SDRAM (512K x 32 x 4 banks) is
a quad-bank DRAM that operates at 3.3V and include a
synchronous interface (all signals are registered on the
positive edge of the clock signal, CLK). Each of the 4
banks’ 16,777,216-bit sections is organized as 2,048
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 and BA1
select the bank, A0–A10 select the row). The address
bits (A0–A7) registered coincident with the READ or
WRITE command are used to select the starting col-
umn location for the burst access.
Prior to normal operation, the SDRAM must be ini-
tialized. The following sections provide detailed infor-
mation covering device initialization, register defini-
tion, command descriptions and device operation.
Initialization
SDRAMs must be powered up and initialized in a
predefined manner. Operational procedures other
than those specified may result in undefined opera-
tion. Once power is applied to V
DD
and V
DD
Q (simulta-
neously) and the clock is stable, the SDRAM requires a
100μs delay prior to applying an executable command.
Starting at some point during this 100μs period and
continuing at least through the end of this period, COM-
MAND INHIBIT or NOP commands should be applied.
Once the 100μs delay has been satisfied with at
least one COMMAND INHIBIT or NOP command hav-
ing been applied, a PRECHARGE command should be
applied. All banks must then be precharged, thereby
placing the device in the all banks idle state.
Once in the idle state, two AUTO REFRESH cycles
must be performed. After the AUTO REFRESH cycles
are complete, the SDRAM is ready for Mode Register
programming. Because the Mode Register will power
up in an unknown state, it should be loaded prior to
applying any operational command.
Register Definition
MODE REGISTER
The Mode Register is used to define the specific
mode of operation of the SDRAM. This definition in-
cludes the selection of a burst length, a burst type, a
CAS latency, an operating mode and a write burst mode,
as shown in Figure 1. The Mode Register is programmed
via the LOAD MODE REGISTER command and will re-
tain the stored information until it is programmed again
or the device loses power.
Mode Register bits M0-M2 specify the burst length,
M3 specifies the type of burst (sequential or inter-
leaved), M4-M6 specify the CAS latency, M7 and M8
specify the operating mode, M9 and M10 should be set
to zero, and M11 and M12 are used to select a tempera-
ture range of the devices operation for improved cur-
rent consumption during Self Refresh..
The Mode Register must be loaded when all banks
are idle, and the controller must wait the specified time
before initiating the subsequent operation. Violating
either of these requirements will result in unspecified
operation.
Burst Length
Read and write accesses to the SDRAM are burst
oriented, with the burst length being programmable,
as shown in Figure 1. The burst length determines the
maximum number of column locations that can be ac-
cessed for a given READ or WRITE command. Burst
lengths of 1, 2, 4, or 8 locations are available for both the
sequential and the interleaved burst types, and a full-
page burst is available for the sequential type. The
full-page burst is used in conjunction with the BURST
TERMINATE command to generate arbitrary burst
lengths.
Reserved states should not be used, as unknown
operation or incompatibility with future versions may
result.
When a READ or WRITE command is issued, a block
of columns equal to the burst length is effectively se-
lected. All accesses for that burst take place within this
block, meaning that the burst will wrap within the block
if a boundary is reached. The block is uniquely se-
lected by A1–A7 when the burst length is set to two; by
A2–A7 when the burst length is set to four; and by A3–
A7 when the burst length is set to eight. The remaining
(least significant) address bit(s) is (are) used to select
the starting location within the block. Full-page bursts
wrap within the page if the boundary is reached.
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