MT4VDDT1664AG-40BF3 Micron Technology Inc, MT4VDDT1664AG-40BF3 Datasheet - Page 8

• Manufacturer Part Number: MT4VDDT1664AG-40BF3
• Description: MODULE DDR 128MB 184-DIMM
• Manufacturer: Micron Technology Inc

Specifications of MT4VDDT1664AG-40BF3

• Memory Type: DDR SDRAM
• Memory Size: 128MB
• Speed: 400MT/s
• Package / Case: 184-DIMM
• Main Category: DRAM Module
• Sub-category: DDR SDRAM
• Module Type: 184UDIMM
• Device Core Size: 64b
• Organization: 16Mx64
• Total Density: 128MByte
• Chip Density: 256Mb
• Maximum Clock Rate: 400MHz
• Operating Supply Voltage (typ): 2.6V
• Operating Current: 1.04A
• Number Of Elements: 4
• Operating Supply Voltage (max): 2.7V
• Operating Supply Voltage (min): 2.5V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Pin Count: 184
• Mounting: Socket
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

General Description
MT8VDDT6464A are high-speed CMOS, dynamic ran-
dom-access, 128MB, 256MB, and 512MB memory
modules organized in a x64 configuration. DDR
SDRAM modules use internally configured quad-bank
DDR SDRAM devices.
tecture to achieve high-speed operation. The double
data rate architecture is essentially a 2n-prefetch
architecture with an interface designed to transfer two
data words per clock cycle at the I/O pins. A single
read or write access for the DDR SDRAM module effec-
tively consists of a single 2n-bit wide, one-clock-cycle
data transfer at the internal DRAM core and two corre-
sponding n-bit wide, one-half-clock-cycle data trans-
fers at the I/O pins.
externally, along with data, for use in data capture at
the receiver. DQS is an intermittent strobe transmitted
by the DDR SDRAM during READs and by the memory
controller during WRITEs. DQS is edge-aligned with
data for READs and center-aligned with data for
WRITEs.
ential clocks (CK and CK#); the crossing of CK going
HIGH and CK# going LOW will be referred to as the
positive edge of CK. Commands (address and control
signals) are registered at every positive edge of CK.
Input data is registered on both edges of DQS, and out-
put data is referenced to both edges of DQS, as well as
to both edges of CK.
are burst oriented; accesses start at a selected location
and continue for a programmed number of locations
in a programmed sequence. Accesses begin with the
registration of an ACTIVE command, which is then fol-
lowed by a READ or WRITE command. The address
bits registered coincident with the ACTIVE command
are used to select the device bank and row to be
accessed (BA0, BA1 select device bank; A0–A11 select
device row for the 128MB module, A0–A12 select
device row for the 256MB and 512MB modules). The
address bits registered coincident with the READ or
WRITE command are used to select the device bank
and the starting device column location for the burst
access.
read or write burst lengths of 2, 4, or 8 locations. An
auto precharge function may be enabled to provide a
self-timed row precharge that is initiated at the end of
the burst access.
pdf: 09005aef80a43556, source: 09005aef80a43534
DDA8C16_32_64x64AG.fm - Rev. D 9/04 EN
The
DDR SDRAM modules use a double data rate archi-
A bidirectional data strobe (DQS) is transmitted
DDR SDRAM modules operate from multiple differ-
Read and write accesses to DDR SDRAM modules
DDR SDRAM modules provide for programmable
MT8VDDT1664A,
MT8VDDT3264A,
128MB, 256MB, 512MB (x64, SR) PC3200
and
8
SDRAM modules allows for concurrent operation,
thereby providing high effective bandwidth by hiding
row precharge and activation time.
power-saving power-down mode. All inputs are com-
patible with the JEDEC Standard for SSTL_2. All out-
puts are SSTL_2, Class II compatible.
information regarding DDR SDRAM operation, refer to
the 128Mb, 256Mb, or 512Mb DDR SDRAM compo-
nent data sheets.
Serial Presence-Detect Operation
detect (SPD). The SPD function is implemented using
a 2,048-bit EEPROM. This nonvolatile storage device
contains 256 bytes. The first 128 bytes can be pro-
grammed by Micron to identify the module type and
various SDRAM organizations and timing parameters.
The remaining 128 bytes of storage are available for
use by the customer. System READ/WRITE operations
between the master (system logic) and the slave
EEPROM device occur via a standard I
DIMM’s SCL (clock) and SDA (data) signals, together
with SA (2:0), which provide eight unique DIMM/
EEPROM addresses. Write protect (WP) is tied to
ground on the module, permanently disabling hard-
ware write protect.
Mode Register Definition
mode of operation of DDR SDRAM devices. This defi-
nition includes the selection of a burst length, a burst
type, a CAS latency and an operating mode, as shown
in Figure 5, Mode Register Definition Diagram, on
page 9.
MODE REGISTER SET command (with BA0 = 0 and
BA1 = 0) and will retain the stored information until it
is programmed again or the device loses power (except
for bit A8, which is self-clearing).
contents of the memory, provided it is performed cor-
rectly. The mode register must be loaded (reloaded)
when all device banks are idle and no bursts are in
progress, and the controller must wait the specified
time before initiating the subsequent operation. Vio-
lating either of these requirements will result in
unspecified operation.
A3 specifies the type of burst (sequential or inter-
leaved), A4–A6 specify the CAS latency, and A7–A11
(128MB) or A7–A12 (256MB, 512MB) specify the oper-
ating mode.
The pipelined, multibank architecture of DDR
An auto refresh mode is provided, along with a
DDR SDRAM modules incorporate serial presence-
The mode register is used to define the specific
Reprogramming the mode register will not alter the
Mode register bits A0–A2 specify the burst length,
Micron Technology, Inc., reserves the right to change products or specifications without notice.
184-PIN DDR SDRAM UDIMM
The mode register is programmed via the
2
©2004 Micron Technology. Inc.
C bus using the
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