General Description
The 1Gb DDR SDRAM is a high-speed CMOS, dynamic random-access memory containing 1,073,741,824 bits. It is internally configured as a quadbank DRAM.
The 1Gb DDR SDRAM uses a double data rate architecture 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 1Gb DDR SDRAM effectively consists of a single 2n-bit wide, one-clock-cycle data transfer at the internal DRAM core and two corresponding n-bit wide, one-half-clock-cycle data transfers at the I/O pins.
A bidirectional data strobe (DQS) is transmitted externally, along with data, for use in data capture at the receiver. DQS is a 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. The x16 offering has two data strobes, one for the lower byte and one for the upper byte.
The 1Gb DDR SDRAM operates from a differential clock (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 output data is referenced to both edges of DQS, as well as to both edges of CK.
Read and write accesses to the DDR SDRAM 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 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. The address bits registered coincident with the READ or WRITE command are used to select the bank and the starting column location for the burst access.
The DDR SDRAM provides for programmable READ or WRITE burst lengths of 2, 4, or 8 locations. An auto precharge function may be enabled to provide a selftimed row precharge that is initiated at the end of the burst access.
As with standard SDR SDRAMs, the pipelined, multibank architecture of DDR SDRAMs allows for concurrent operation, thereby providing high effective bandwidth by hiding row precharge and activation time.
An auto refresh mode is provided, along with a power-saving power-down mode. All inputs are compatible with the JEDEC Standard for SSTL_2. All full drive option outputs are SSTL_2, Class II compatible.

Features
*VDD = +2.5V ±0.2V, VDDQ = +2.5V ±0.2V
*Bidirectional data strobe (DQS) transmitted/received with data, i.e., source-synchronous data capture (x16 has two – one per byte)
*Internal, pipelined double-data-rate (DDR) architecture; two data accesses per clock cycle
*Differential clock inputs (CK and CK#)
*Commands entered on each positive CK edge
*DQS edge-aligned with data for READs; centeraligned with data for WRITEs
*DLL to align DQ and DQS transitions with CK
*Four internal banks for concurrent operation
*Data mask (DM) for masking write data (x16 has two–one per byte)
*Programmable burst lengths: 2, 4, or 8
*Auto Refresh and Self Refresh Modes
*Longer lead TSOP for improved reliability (OCPL)
*2.5V I/O (SSTL_2 compatible)
*Concurrent auto precharge option is supported
*tRAS lockout supported (tRAP = tRCD)

MT46V128M8, MT46V64M16
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