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参数资料
| 型号： | W3HG2128M72AEF665F2MBG |
| 厂商： | WHITE ELECTRONIC DESIGNS CORP |
| 元件分类： | DRAM |
| 英文描述： | 256M X 72 DDR DRAM MODULE, DMA240 |
| 封装： | ROHS COMPLIANT, DIMM-240 |
| 文件页数： | 14/18页 |
| 文件大小： | 348K |
| 代理商： | W3HG2128M72AEF665F2MBG |
W3HG2128M72AEF-Fx
June 2007
Rev. 3
ADVANCED*
5
White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
FUNCTIONAL DESCRIPTION
ADVANCED MEMORY BUFFER (AMB)
The AMB reference design complies with the "FBDIMM
Architecture and Protocol Specication" (JEDEC
standards, pending). It is expected that there will be
multiple vendors for the AMB which will offer at least
the minimum functionally as set forth in the industry
specication. To achieve optimal operation and
compatibility with DDR2 SDRAM device and host/
controller offerings, each vendor's AMB will have a
unique set of personality bytes contained in the SPD for
setting up and ne tuning their device.
The FBDIMM specication denes a number of options
to support the requirements of different applications.
The capabilities of the AMB are communicated to the
host during the initialization process in the TS2 training
pattern and in bits readable in the features register in
the AMB.
The AMB is responsible for handling FBDIMM channel
and memory requests to and from the local FBDIMM
and for forwarding requests to other FBDIMMs on
the channel. A complete and detailed description of
the AMB is contained in the proposed FBDIMM AMB
Specication. The AMB is a memory interface that
connects an array of DDR2 SDRAM devices to the
FBDIMM channel. The AMB is a slave device on
the channel responding to channel commands and
forwarding channel commands to other AMB devices.
All memory control for the DDR2 SDRAM resides in the
host, including memory request initiation, timing, refresh,
scrubbing, sparing, conguration access, and power-
management.
The AMB is expected to perform the following functions:
Support channel initialization procedures as
defined in the initialization chapter of the FBDIMM
Architecture and Protocol Specification to align the
clocks and the frame boundaries and verify channel
connectivity
Support the forwarding of southbound and
northbound frames, servicing requests directed to a
specific FBDIMM's AMB, as defined in the protocol
chapter of the specification, and merging the return
data into the northbound frames.
Initialize northbound frames if the FBDIMM's AMB
is the last, southern-most on the channel, initialize
northbound frames.
Detect errors on the channel and report them to the
host memory controller
Support the FBDIMM configuration register set as
defined in the FBDIMM AMB specification register
chapter of the specification
Act as a DRAM memory buffer for all read, write,
and configuration accesses addressed to a specific
FBDIMM's AMB
Provide a read and write buffer FIFO
Supports an SMBus protocol interface for access to
the AMB configuration registers
Provide features to support MEMBIST and IBIST
test functions
Provide a register interface for the thermal sensor
and status indicator
Function as a repeater to extend the maximum
length of FBDIMM Links
Reconfigures FBDIMM inputs from differential high-
speed link receivers to two single-ended, low-speed
receivers (~200 MHz). These inputs directly control
DDR2 command/address and input data that is
replicated to all DDR2 SDRAMs devices.
Bypass high-speed parallel serial circuitry and
provide test results back to the tester, using low-
speed FBDIMM outputs
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相关代理商/技术参数 |
参数描述 |
|---|---|
| W3HG264M72EER403AD7XG | 制造商:WEDC 制造商全称:White Electronic Designs Corporation 功能描述:1GB - 2x64Mx72 DDR2 SDRAM REGISTERED, w/PLL, VLP Mini-DIMM |
| W3HG264M72EER534AD7XG | 制造商:WEDC 制造商全称:White Electronic Designs Corporation 功能描述:1GB - 2x64Mx72 DDR2 SDRAM REGISTERED, w/PLL, VLP Mini-DIMM |
| W3HG264M72EER665AD7XG | 制造商:WEDC 制造商全称:White Electronic Designs Corporation 功能描述:1GB - 2x64Mx72 DDR2 SDRAM REGISTERED, w/PLL, VLP Mini-DIMM |
| W3HG264M72EER806AD7XG | 制造商:WEDC 制造商全称:White Electronic Designs Corporation 功能描述:1GB - 2x64Mx72 DDR2 SDRAM REGISTERED, w/PLL, VLP Mini-DIMM |
| W3HG264M72EER-AD7 | 制造商:WEDC 制造商全称:White Electronic Designs Corporation 功能描述:1GB - 2x64Mx72 DDR2 SDRAM REGISTERED, w/PLL, VLP Mini-DIMM |
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