This part is a kind of semiconductor called A3S56D40GTP.

Function of this product has 256M Double Data Rate Synchronous DRAM.

Manufacturers : Zentel

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Some of the text within the PDF file :

A3S56D30GTP A3S56D40GTP 256M Double Data Rate Synchronous DRAM 256Mb DDR SDRAM Specification A3S56D30GTP A3S56D40GTP Zentel Electronics Corp. Revision 1.1 Jul., 2013 A3S56D30GTP A3S56D40GTP 256M Double Data Rate Synchronous DRAM General Description A3S56D30GTP is a 4-bank x 8,388,608-word x 8bit, A3S56D40GTP is a 4-bank x 4,194,304-word x 16bit double data rate synchronous DRAM , with SSTL_2 interface. All control and address signals are referenced to the rising edge of CLK. Input data is registered on both edges of data strobe ,and output data and data strobe are referenced on both edges of CLK. The A3S56D30/40GTP achieves very high speed clock rate up to 200 MHz . Features - VDD=VDDQ=2.5V+0.2V - Double data rate architecture; two data transfers per clock cycle - Bidirectional, data s [ ... ]

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