Artesyn ATCA-9405 Installation and Use (May 2014) - Manual (Page 61)

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ATCA-9405 Installation and Use (6806800M71G) 61
3.4 System Memory
3.4.1 Memory Interface
All four CN6880 memory controllers are used on ATCA-9405. Each memory controller provides
a 72-bit (64-bit data plus 8-bit for ECC) wide DDR3 interface channel that connects with a single
DDR3 DIMM socket.
Two physical memory banks (chip select signals) are implemented per DIMM socket to allow
use of single-rank and dual-rank DIMM modules. The use of quad-rank DIMM modules is not
supported by the memory controller.
Each DDR3 memory channel runs at data rates from 600 MHz to 1333 MHz providing a total
bandwidth of up to 10.6 GBps per memory channel. The DDR3 speeds supported by CN6880
are listed in the table below.
3.4.2 Memory Socket
Four VLP DDR3 DIMM sockets (one DIMM socket per memory channel) are provided to install
in the shelf DIMM modules. The socket is keyed for DDR3 DIMM modules using 1.5V supply
voltage.
Table 3-1 DDR3 Speed Grades
Standard
Name Memory
Clock Cycle
Time I/O Bus
Clock
Data
Transfer Per
Second
Module
Name Peak Transfer
Rate
DDR3-800 100 MHz 10 ns 400 MHz 800 Million PC3-6400 6400 MBps
DDR3-1066 133 MHz 7.5 ns 533 MHz 1066 Million PC3-8500 8533 MBps
DDR3-1333 166 MHz 6 ns 667 MHz 1333 Million PC3-10600 10667 MBps