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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� EP2S60F484C4N
寤犲晢锛� Altera
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 729/768闋�(y猫)
鏂囦欢澶у皬锛� 0K
鎻忚堪锛� IC STRATIX II FPGA 60K 484-FBGA
鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� Three Reasons to Use FPGA's in Industrial Designs
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 20
绯诲垪锛� Stratix® II
LAB/CLB鏁�(sh霉)锛� 3022
閭忚集鍏冧欢/鍠厓鏁�(sh霉)锛� 60440
RAM 浣嶇附瑷�(j矛)锛� 2544192
杓稿叆/杓稿嚭鏁�(sh霉)锛� 334
闆绘簮闆诲锛� 1.15 V ~ 1.25 V
瀹夎椤炲瀷锛� 琛ㄩ潰璨艰
宸ヤ綔婧害锛� 0°C ~ 85°C
灏佽/澶栨锛� 484-BBGA
渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 484-FBGA锛�23x23锛�
閰嶇敤锛� 544-1700-ND - DSP KIT W/STRATIX II EP2S60N
544-1697-ND - NIOS II KIT W/STRATIX II EP2S60N
鍏跺畠鍚嶇ū锛� 544-1907
EP2S60F484C4N-ND
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Altera Corporation
11鈥�19
May 2007
Stratix II Device Handbook, Volume 2
High-Speed Board Layout Guidelines
鈻�
Ensure that D > 2S to minimize the crosstalk between the two
differential pairs.
鈻�
Place the differential traces S = 3H as they leave the device to
minimize reflection noise.
鈻�
Keep the length of the two differential traces the same to minimize
the skew and phase difference.
鈻�
Avoid using multiple vias because they can cause impedance
mismatch and inductance.
Termination
Schemes
Mismatched impedance causes signals to reflect back and forth along the
lines, which causes ringing at the load receiver. The ringing reduces the
dynamic range of the receiver and can cause false triggering. To eliminate
reflections, the impedance of the source (ZS) must equal the impedance of
the trace (Zo), as well as the impedance of the load (ZL). This section
discusses the following signal termination schemes:
鈻�
Simple parallel termination
鈻�
Thevenin parallel termination
鈻�
Active parallel termination
鈻�
Series-RC parallel termination
鈻�
Series termination
鈻�
Differential pair termination
Simple Parallel Termination
In a simple parallel termination scheme, the termination resistor (RT) is
equal to the line impedance. Place the RT as close to the load as possible
to be efficient (see Figure 11鈥�22).
Figure 11鈥�22. Simple Parallel Termination
The stub length from the RT to the receiver pin and pads should be as
small as possible. A long stub length causes reflections from the receiver
pads, resulting in signal degradation. If your design requires a long
termination line between the terminator and receiver, the placement of
the resistor becomes important. For long termination line lengths, use
fly-by termination (see Figure 11鈥�23).
Zo = 50 惟
RT = Zo
SL
Stub
S = Source
L = Load
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