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1.0 Description

The INFINEON HYS72Taaabcd[G/H]R module family are low profile Registered DIMM modules

with 30,00 mm height based on DDR2 technology. DIMMs are available in 64M x 72 (512MByte),

128M x 72 (1GByte) and 256M x 72 (2GByte) organisation and density, intended for mounting into

240 pin connector sockets.

The memory array is designed with 512Mb Double Data Rate (DDR2) Synchronous DRAMs for

ECC applications. All control and address signals are re-driven on the DIMM using register devices

and a PLL for the clock distribution. This reduces capacitive loading to the system bus, but adds one

cycle to the SDRAM timing. Decoupling capacitors are mounted on the PCB board, which provide

a proper voltage supply impedance over the whole frequency range of operations as number and

values are accordant to the JEDEC specification. The DIMMs feature serial presence detect based

on a serial E2PROM device using the 2-pin I2C protocol. The first 128 bytes are programmed with

configuration data and the second 128 bytes are available to the customer.