有關DFI P965 Dark深入討論

[狂少]

OK, 大家好
狂少又來跟大家一起研究這片Intel 的一代神板
DFI P965 Dark...
這片板子真的是無話可說
其驚人的價格與效能比,真的是讓我真的想多買幾片

這片主機板更是開啟一些DDR2非常重要的設定選項,真正把DDR2的效能選項與系統
深深結合. 但是在這之前的條件必須是你要真正了解一些選項的作用
狂少會盡可能用中文好好說明,但是大家也要諒解,一些專有的用字用詞也不是用中文就可以把它們說明到100%
所以大家多包函...
下面是一些圖片與bios設定最重要的部分,我都有中英俱備嚕
但是像這兩張圖,就是真的沒辦法,我會另外說明
現在也正在撰寫一些有用的DDR2信號問題,
像是MCH ODT(Memory Control Hub On Die Termination )Latency; DQ Calibraction..

如果你要你的系統比別人強.這些都不是你用auto就能達到的
所以只要你能弄懂這些,bios沒Auto出現,你就成功嚕

BIOS,這些只是狂少之前在設定時拍下的,並非公式,不過大部分都差不多可以用
等一些說明寫好後,我們再去討論每一種不同設定
測試則請多參考C大的測試

 

[tom7089]

狂少，第二張bios01.jpg圖出不來！

 

[狂少]

沒那張圖啦..打錯字嚕

像這個,我真的不知道怎翻...
DQ calibration 與GTL+ Driving strength 的關係與作用

Calibrating the impedance of an output driver on an IC can have several advantages. It can reduce(可以減低)

reflections on the output signal
electromagnetic interference (EMI)
power dissipation
signal skew
and provide termination impedances.

So the option, GTL+ Driving Strength (Gunning Transceiver Logic+), showing here is a signaling scheme
which rely upon controlled impedance output drivers to completethe job of specified voltage swings.

so here is an example about how the job gonna be set and done:

"a GTL+ bus with a 50Ω characteristic impedance can be terminated with 50Ω to Vtt internal to the IC at each end of the bus. This can be done by using a controlled impedance pull-up at 50Ω. The 50Ω pull-up is a first desired controlled impedance. 

To achieve specified voltage swings, drivers that are located in the middle of the bus may be set to pull-down to ground with an impedance of 12.5Ω. This 12.5Ω pull-down is a second desired controlled impedance. 

Twenty-five ohms of pull-down impedance is desired at the end of the bus because, to save power, it is also desirable to turn off the 50Ω termination internal to the IC's at each end of the bus when those IC's are driving. This is a third desired controlled impedance. Finally, a 50Ω pull-down is a fourth controlled impedance that would be desired if the same driver were to be used with a source-terminated bus having a characteristic impedance of 50Ω."

Accordingly, there is a need in the art for a controlled impedance driver that can easily change it's drive impedance for use in multiple applications. It is desirable that each drive impedance be able to use the same calibration information as the other drive impedances. This simplifies the design of the IC because a single set of calibration information can be distributed and used by different drivers to produce the appropriate drive impedance for it's desired application. Finally, it is desirable that only a minimum number of control signals are necessary to switch between impedances.

 

[hwu10]

感謝狂爺教學及分享．．．

 

[狂少]

OK, so we all know what is DDR2; but here are some special technical notes
for normal users is "unnecessary" unless some motherboard manufactures
start to integrate those options into BIOS just as DFI did this time.

Honestly, from DFI's P965, what we so called the hard part merely ony
GTL+ Driving Strength, DQ alibraction or MCH ODT latency. Other than that,
the bios does not show anything "too hard to understand" part.

Normally, we all know DDR2 SDRAM is based on the 4bit prefech architecture to reach high speed

operation; in this architecture, DDR2 SDRAM can read/write as 4 times same amount of DATA as an

external bus to/from (both ways) memory cell array for every clock, and 4 times faster than

internal bus operation frequency. well where are these from?

ok, we can trace those back here:

[COLOR="Red"]External clock freq.= 2x internal bus operation freq
Double Data Rate output=2x External clock freq.[/COLOR]

Now recall the PC-133 SDR(single Data Rate) SDRAM?, how about a comparison table amount of SDRT,

DDR, DDR2?

then let's look at into another way by block signal.

so this is the first step you might want to understand how fast DDR2 really is.

Next , we will talk about ODT, that's it, On Die Termination

 

[lenchue]

狂爺又出新教學摟:MMM:
不過小弟有看沒有懂啦:PPP:
不過小弟會慢慢的體會的;em03;

 

[狂少]

sorry啦
有些東西不懂直接在板上問
英文不懂的話多查查字典,或是我會拜託Hyde大略上翻一下..
又有人遭殃嚕...:D

 

[狂少]

有人有NCQ硬碟會作怪問題嗎?(SATA)

 

[coolaler]

專業的解說抵過我的一堆測試:MMM: ;cheer2;

 

[hsien0304]

不好意思...借問一下..
剛才我看到ite系統溫度48度
閃紅色..
然後我重開機
就一直嗶(連續長音)..
請問是因為北橋太熱了嗎??