DESCRIPTION
The Hynix H5MS1262EFP Series is 268,435,456-bit CMOS Low Power Double Data Rate Synchronous DRAM (Mobile DDR SDRAM), ideally suited for mobile applications which use the battery such as PDAs, 2.5G and 3G cellular phones with internet access and multimedia capabilities, mini-notebook, hand-held PCs. It is organized as 4banks of 4,194,304 x16.
The HYNIX H5MS1262EFP series 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 per clock cycle at the I/O pins.

The Hynix H5MS1262EFP Series offers fully synchronous operations referenced to both rising and falling edges of the clock. While all address and control inputs are latched on the rising edges of the CK (Mobile DDR SDRAM operates from a differential clock: the crossing of CK going HIGH and CK going LOW is referred to as the positive edge of CK), data, data strobe and data mask inputs are sampled on both rising and falling edges of it (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). The data paths are internally pipelined and 2-bit prefetched to achieve high bandwidth. All input voltage levels are compatible with LVCMOS.

Read and write accesses to the Low Power DDR SDRAM (Mobile 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 the 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.