WEDPN16M64VR-XBX
16MX64REGISTEREDSYNCHRONOUSDRAM
FEATURES
GENERAL DESCRIPTION
! Registered for enhanced performace of bus speeds
The 128MByte (1Gb) SDRAMis a high-speed CMOS, dynamic
random-access,memoryusing4 chipscontaining268,435,456
bits. Each chip is internally configured as a quad-bank DRAM
with a synchronous interface. Each of the chip’s 67,108,864-
bit banks is organized as 8,192 rows by 512 columns by 16
bits. The MCP also incorporates two 16-bit universal bus
drivers for input control signals and addresses.
• 66, 100, 125, 133** MHz
! Package:
• 219 Plastic Ball Grid Array (PBGA), 32 x 25mm
! Single 3.3V ± 0.3V power supply
! Fully Synchronous; all signals registered on positive edge
Read and write accesses to the SDRAM are burst oriented;
accesses start at a selected location and continue for a
programmed number of locations in a programmed se-
quence. Accesses begin with the registration of an ACTIVE
command, which is then followed by a READ or WRITE
command. The address bits registered coincident with the
ACTIVE command are used to select the bank and row to be
accessed (BA0, BA1 select the bank; A0-12 select the row).
The address bits registered coincident with the READ or
WRITE command are used to select the starting column
location for the burst access.
of system clock cycle
! Internal pipelined operation; column address can be
changed every clock cycle
! Internal banks for hiding row access/precharge
! Programmable Burst length 1,2,4,8 or full page
! 8,192 refresh cycles
! Commercial, Industrial and Military Temperature Ranges
! Organized as 16M x 64
• User configureable as 32M x 32
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 thatisinitiated
at the end of the burst sequence.
! Weight: WEDPN16M64VR-XBX - 2.5 grams typ ical
BENEFITS
! 37% SPACE SAVINGS
The 1Gb SDRAM uses an internal pipelined architecture to
achieve high-speed operation. This architecture is compat-
ible with the 2n rule of prefetch architectures, but it also
allows the column address to be changed on every clock
cycle to achieve ahigh-speed,fullyrandomaccess.Precharging
one bank while accessing one of the other three banks will
hide the precharge cycles and provide seamless, high-
speed, random-access operation.
! 17% I/O Reduction
! Reduced part count
! Reduced trace lengths for lower parasitic capacitance
! Glue-less connection to memory controller/PCI Bridge
! Suitable for hi-reliability applications
! Laminate interposer for optimum TCE match
! Upgradeable to 32M x 64 density (contact factory for
The 1Gb 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.
information)
*This data sheet describes a product that is subject to change without notice.
**Available in commercial and industrial temperatures only.
All inputs and outputs are LVTTL compatible. SDRAMs offer
substantial advances in DRAM operating performance, in-
cluding the ability to synchronously burst data at a high data
rate with automatic column-address generation, the ability to
interleave between internal banks in order to hide precharge
time and the capability to randomly change column ad-
dresses on each clock cycle during a burst access.
November 2003 Rev. 4
1
White Electronic Designs Corporation • (602) 437-1520 • www.whiteedc.com