参数资料
型号: HW-SPAR3A-SK-UNI-G
厂商: Xilinx Inc
文件页数: 36/143页
文件大小: 0K
描述: KIT STARTER W/SPARTAN-3A
产品培训模块: FPGAs Spartan3
产品变化通告: Adapter Replacement 23/May/2008
标准包装: 1
系列: Spartan®-3A
类型: FPGA
适用于相关产品: Spartan?3A FPGA,XC3S700A-FG484
所含物品: 板,线缆,文档,电源
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其它名称: 122-1514
Chapter 3: Clock Sources
Clock Connections
Each of the clock inputs connect directly to a global buffer input. As shown in Table 3-1 ,
each of the clock inputs also optimally connects to an associated DCM.
Only the CLK_AUX or the CLK_SMA input can use the associated DCM at any time.
However, both inputs are available as clock inputs.
R
Table 3-1:
Clock Inputs and Associated Global Buffers and DCMs
Clock Input
CLK_50MHZ
CLK_AUX
CLK_SMA
FPGA Pin
E12
V12
U12
I/O Bank
0
2
2
Global Buffer
GCLK5
GCLK2
GCLK3
Associated DCM
Top Right
Bottom Right
LOC
DCM_X2Y3
DCM_X2Y0
50 MHz On-Board Oscillator
The board includes a 50 MHz oscillator with a 40% to 60% output duty cycle. The oscillator
is accurate to ±2500 Hz or ±50 ppm.
Auxiliary Clock Oscillator Socket
The provided eight-pin socket accepts clock oscillators that fit the eight-pin DIP (8DIP)
footprint. Use this socket if the FPGA application requires a frequency other than 50 MHz.
Alternatively, use the FPGA’s Digital Clock Manager (DCM) to generate or synthesize
other frequencies from the on-board 50 MHz oscillator.
Caution! Be aware of the pin 1 orientation on the crystal oscillator when installing it in the
associated socket.
SMA Clock Input or Output Connector
To provide a clock from an external source, connect the input clock signal to the SMA
connector. The FPGA can also generate a single-ended clock output or other high-speed
signal on the SMA clock connector for an external device.
UCF Constraints
The clock input sources require two different types of constraints. The location constraints
define the I/O pin assignments and I/O standards. The period constraints define the clock
period—and consequently the clock frequency—and the duty cycle of the incoming clock
signal.
Location
Figure 3-2 provides the UCF constraints for the three clock input sources, including the
I/O pin assignment and the I/O standard used.
NET "CLK_50MHZ" LOC = "E12"| IOSTANDARD = LVCMOS33 ;
NET "CLK_AUX"
NET "CLK_SMA"
LOC = "V12"| IOSTANDARD = LVCMOS33 ;
LOC = "U12"| IOSTANDARD = LVCMOS33 ;
Figure 3-2:
UCF Location Constraints for Clock Sources
36
Spartan-3A FPGA Starter Kit Board User Guide
UG330 (v1.3) June 21, 2007
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