MT16VDDT6464AG-335GB Micron Technology Inc, MT16VDDT6464AG-335GB Datasheet - Page 8

• Manufacturer Part Number: MT16VDDT6464AG-335GB
• Description: MODULE SDRAM DDR 512MB 184DIMM
• Manufacturer: Micron Technology Inc

Specifications of MT16VDDT6464AG-335GB

• Memory Type: DDR SDRAM
• Memory Size: 512MB
• Speed: 333MT/s
• Package / Case: 184-DIMM
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

General Description
MT16VDDT12864A, and MT16VDDT25664A are high-
speed CMOS, dynamic random-access, 256MB,
512MB, 1GB and 2GB memory modules organized in
x64 configuration. DDR SDRAM modules use inter-
nally configured quad-bank DDR SDRAM devices.
tecture to achieve high-speed operation. Double data
rate architecture is essentially a 2n-prefetch architec-
ture 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 effectively
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.
clock inputs (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 devices bank; A0–A11 select
device row for 256MB; A0–A12 select device row for
512MB, 1GB; A0–A13 select device row for 2GB). 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: 09005aef80739fa5, source: 09005aef807397e5
DD16C32_64_128_256x64AG.fm - Rev. C 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 differential
Read and write accesses to DDR SDRAM modules
DDR SDRAM modules provide for programmable
MT16VDDT3264A,
MT16VDDT6464A,
256MB, 512MB, 1GB, 2GB (x64, DR)
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, 512Mb, or 1Gb DDR SDRAM com-
ponent 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 (DIMM) occur via a standard I
using the 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 the DDR SDRAM. This definition
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.
The mode register is programmed via the MODE REG-
ISTER SET command (with BA0 = 0 and BA1 = 0) and
will retain the stored information until it is pro-
grammed 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.
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
Micron Technology, Inc., reserves the right to change products or specifications without notice.
184-PIN DDR SDRAM UDIMM
©2004 Micron Technology, Inc.
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C bus