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MT36VDDF25672G-26A Datasheet(PDF) 9 Page - Micron Technology |
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MT36VDDF25672G-26A Datasheet(HTML) 9 Page - Micron Technology |
9 / 20 page PDF: 09005aef80772fd2/Source: 09005aef8075ebf6 Micron Technology, Inc., reserves the right to change products or specifications without notice. DDF36C128_256x72.fm - Rev. G 9/08 EN 9 ©2002 Micron Technology, Inc. All rights reserved. 1GB, 2GB (x72, ECC, DR) 184-Pin DDR SDRAM RDIMM General Description General Description The MT36VDDF12872 and MT36VDDF25672 are high-speed, CMOS dynamic random access 1GB and 2GB memory modules organized in a x72 configuration. These modules use DDR SDRAM devices with four internal banks. DDR SDRAM modules use a double data rate architecture to achieve high-speed opera- tion. 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 DDR SDRAM modules effectively consists of a single 2n-bit-wide, one-clock-cycle data transfer at the internal DRAM core and two corre- sponding 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. DDR SDRAM modules operate from differential clock inputs (CK and CK#); the crossing of CK going HIGH and CK# going LOW will be referred to as the positive edge of CK. Commands 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. Register and PLL Operation These DDR SDRAM modules operate in registered mode, where the control, command, and address input signals are latched in the registers on the rising clock edge and sent to the DDR SDRAM devices on the following rising clock edge (data access is delayed by one clock cycle). A phase-lock loop (PLL) on the module receives and redrives the differ- ential clock signals (CK, CK#) to the DDR SDRAM devices. The register(s) and PLL reduce control, command, address, and clock signals loading by isolating DRAM from the system controller. PLL clock timing is defined by JEDEC specifications and ensured by use of the JEDEC clock reference board. Registered mode will add one clock cycle to CL. Serial Presence-Detect Operation DDR SDRAM modules incorporate serial presence-detect. The SPD data is stored in a 256-byte EEPROM. The first 128 bytes are programmed by Micron to identify the module type and various DDR SDRAM organizations and timing parameters. The remaining 128 bytes of storage are available for use by the customer. System READ/WRITE operations between the master (system logic) and the slave EEPROM device occur via a standard I2C bus using the DIMM’s SCL (clock) and SDA (data) signals, together with SA[2:0], which provide eight unique DIMM/EEPROM addresses. Write protect (WP) is connected to VSS, permanently disabling hardware write protect. |
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