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2.1.5
Technology Enhancements of Intel
®
(Intel
The following sections describe the Just-in-Time Scheduling, Command Overlap, and
Out-of-Order Scheduling Intel FMA technology enhancements.
2.1.5.1
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.
2.1.5.2
Command Overlap
Command Overlap allows the insertion of the DRAM commands between the Activate,
Precharge, 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.
2.1.5.3
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.
2.1.6
System Memory Pre-Charge Power Down Support Details
The IMC supports and enables the following DDR3 DRAM Device pre-charge power
down DLL controls during a pre-charge power down.
• Slow Exit is where the DRAM device DLL is disabled after entering pre-charge
power down
• Fast Exit is where the DRAM device DLLs are maintained after entering pre-charge
power down
Table 2-3.
System Memory Pre-Charge Power Down Support
DIMM per Channel
Configuration
24
FMA)
One
Two
One
Registered DIMM Raw Cards A, B, D, or E
Two or Three
Registered DIMM Raw Cards A, B, D, or E
One or Two
Registered DIMM Raw Cards G or H
®
Fast Memory Access
DIMM Type
Unbuffered DIMM
Unbuffered DIMM
Interfaces
Precharge Power Down
Slow/Fast Exit
Slow Exit
Fast Exit
Slow Exit
Fast Exit
Fast Exit
Datasheet, Volume 1
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