参数资料
型号: HW-SPAR3A-SK-UNI-G
厂商: Xilinx Inc
文件页数: 29/143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
R
3.3V
Rotary / Push Button
FPGA I/O Pin
Rotary Push-Button Switch
ROT_CENTER Signal
UG230_c2_05_021206
Figure 2-8: Push-Button Switches Require an Internal Pull-up Resistor in the FPGA
Input Pin
Rotary Shaft Encoder
In principal, the rotary shaft encoder behaves much like a cam connected to the central
shaft. Rotating the shaft then operates two push-button switches, as shown in Figure 2-9 .
Depending on which way the shaft is rotated, one of the switches opens before the other.
Likewise, as the rotation continues, one switch closes before the other. However, when the
shaft is stationary, also called the detent position, both switches are closed.
A pull-up resistor in each input pin
generates a ‘1’ for an open switch.
See the UCF file for details on
specifying the pull-up resistor.
FPGA
Vcco
A=‘0’
Vcco
Rotary Shaft
Encoder
GND
B=‘1’
UG230_c2_06_030606
Figure 2-9:
Basic Example of Rotary Shaft Encoder Circuitry
Closing a switch connects it to ground, generating a logic Low. When the switch is open, a
pull-up resistor within the FPGA pin pulls the signal to a logic High. The UCF constraints
in Figure 2-11 describe how to define the pull-up resistor.
The FPGA circuitry to decode the ‘A’ and ‘B’ inputs is simple but must consider the
mechanical switching noise on the inputs, also called chatter. As shown in Figure 2-10 , the
Spartan-3A FPGA Starter Kit Board User Guide
UG330 (v1.3) June 21, 2007
29
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