参数资料
型号: HW-SPAR3AN-SK-UNI-G
厂商: Xilinx Inc
文件页数: 126/140页
文件大小: 0K
描述: KIT STARTER SPARTAN-3 AN
产品变化通告: Adapter Replacement 23/May/2008
标准包装: 1
系列: Spartan®-3AN
类型: FPGA
适用于相关产品: Spartan-3AN XC3S700AN-FG484,XCF04S-VOG20C
所含物品: 面板、缆线、软件、数据表和用户手册
相关产品: XC3S700AN-5FGG484C-ND - IC FPGA SPARTAN-3A 700K 484-FBGA
122-1598-ND - IC FPGA SPARTAN -3AN700K 484FBGA
122-1556-ND - IC SPARTAN-3AN FPGA 700K 484FBGA
其它名称: 122-1528
HW-SPAR3AN-SK-UNI-G-PROMO
HW-SPAR3AN-SK-UNI-G-PROMO-ND
Chapter 15: Expansion Connectors
behaves like an internal termination resistor of approximately 100 Ω . On-chip differential
termination is only available on full I/O pairs, not on Input-only pairs.
Differential inputs are powered by the V CCAUX supply, which is 3.3V by default.
Differential inputs are available in any I/O bank.
R
Pads for 100 Ω
surface-mount resistor
FPGA
Differential termination
(~100 Ω )
FPGA
LxxP_0
LxxN_0
PAD
IBUFDS or
BUFGDS
Signal
LxxP_0
LxxN_0
PAD
IBUFDS or
BUFGDS
Signal
a) External 100 Ω termination resistor
(not provided on the Starter Kit)
b) On-chip differential input termination
UG334_c15_04_052407
Figure 15-4:
Differential Input Termination Options
Using Differential Outputs
Differential inputs are supported within any I/O bank. However, with Spartan-3A and
Spartan-3AN FPGAs, differential outputs are only supported on I/O Bank 0 or 2.
Differential outputs are powered by the respective I/O bank output voltage, V CCO . On the
Spartan-3A/3AN Starter Kit board, I/O Banks 0, 1, and 2 are all powered by a 3.3V supply.
I
FPGA
Signal
OBUFDS
PAD
LxxP_2
LxxN_2
UG330_c12_06_072706
Figure 15-5: Differential Outputs
Differential Trace Layout Considerations
Figure 15-6 shows board layout extracted from the Starter Kit board that highlights the
differential I/O signal traces. These traces were routed for optimal signal integrity.
126
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All differential pairs are routed with matched 100 Ω impedance on the top board layer
for maximum performance.
The traces were routed to avoid via where possible.
The trace lengths for differential pairs routed to a specific header (either the “Receive”
or “Transmit” header) were matched to within 0.25 inches.
The differential signals connections on the FPGA use the outer two ball rings to avoid
breakout congestion.
The “Receive” differential clock pair, highlighted in blue in Figure 15-6 , connects to a
differential global clock input pair, GCLK7 and GCLK8. Using these global clock
www.xilinx.com Spartan-3A/3AN FPGA Starter Kit Board User Guide
UG334 (v1.1) June 19, 2008
相关PDF资料
PDF描述
HW-V4-ML403-UNI-G-J EVALUATION PLATFORM VIRTEX-4
HW-V4-ML405-UNI-G-J EVALUATION PLATFORM VIRTEX-4
HW-V4-ML410-UNI-G-J EVALUATION PLATFORM VIRTEX-4
HW-V5-ML501-UNI-G EVALUATION PLATFORM VIRTEX-5
HW-V5-ML507-UNI-G EVAL PLATFORM V5 FXT
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参数描述
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