Intel E3-1225 v3 BX80646E31225V3 사용자 설명서
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BX80646E31225V3
2.1.3.1
System Memory Frequency
In all modes, the frequency of system memory is the lowest frequency of all memory
modules placed in the system, as determined through the SPD registers on the
memory modules. The system memory controller supports one or two DIMM
connectors per channel. The usage of DIMM modules with different latencies is
allowed, but in that case, the worst latency (among two channels) will be used. For
dual-channel modes, both channels must have a DIMM connector populated and for
single-channel mode only a single-channel may have one or both DIMM connectors
populated.
2.1.3.2
Intel
®
Fast Memory Access (Intel
®
FMA) Technology Enhancements
The following sections describe the Just-in-Time Scheduling, Command Overlap, and
Out-of-Order Scheduling Intel FMA technology enhancements.
Just-in-Time Command Scheduling
The memory controller has an advanced command scheduler where all pending
requests are examined simultaneously to determine the most efficient request to be
issued next. The most efficient request is picked from all pending requests and issued
to system memory Just-in-Time to make optimal use of Command Overlapping. Thus,
instead of having all memory access requests go individually through an arbitration
mechanism forcing requests to be executed one at a time, they can be started without
interfering with the current request allowing for concurrent issuing of requests. This
allows for optimized bandwidth and reduced latency while maintaining appropriate
command spacing to meet system memory protocol.
Command Overlap
Command Overlap allows the insertion of the DRAM commands between the Activate,
Pre-charge, and Read/Write commands normally used, as long as the inserted
commands do not affect the currently executing command. Multiple commands can be
issued in an overlapping manner, increasing the efficiency of system memory protocol.
Out-of-Order Scheduling
While leveraging the Just-in-Time Scheduling and Command Overlap enhancements,
the IMC continuously monitors pending requests to system memory for the best use of
bandwidth and reduction of latency. If there are multiple requests to the same open
page, these requests would be launched in a back-to-back manner to make optimum
use of the open memory page. This ability to reorder requests on the fly allows the
IMC to further reduce latency and increase bandwidth efficiency.
2.1.3.3
Data Scrambling
The system memory controller incorporates a Data Scrambling feature to minimize the
impact of excessive di/dt on the platform system memory VRs due to successive 1s
and 0s on the data bus. Past experience has demonstrated that traffic on the data bus
is not random and can have energy concentrated at specific spectral harmonics
creating high di/dt which is generally limited by data patterns that excite resonance
between the package inductance and on die capacitances. As a result, the system
memory controller uses a data scrambling feature to create pseudo-random patterns
on the system memory data bus to reduce the impact of any excessive di/dt.
Interfaces—Processor
Intel
®
Xeon
®
Processor E3-1200 v3 Product Family
June 2013
Datasheet – Volume 1 of 2
Order No.: 328907-001
21