参数资料
型号: HW-SPAR3-SK-UNI-G
厂商: Xilinx Inc
文件页数: 17/64页
文件大小: 0K
描述: KIT STARTER SPARTAN-3
产品变化通告: Adapter Replacement 23/May/2008
Development Systems Discontinuation 22/Jun/2009
标准包装: 1
系列: Spartan-3
类型: FPGA 配置
适用于相关产品: Spartan-3
所含物品: 面板、缆线、软件、数据表和用户手册
其它名称: 122-1521
R
The LED control signals are time-multiplexed to display data on all four characters, as
shown in Figure 3-2 . Present the value to be displayed on the segment control inputs and
select the specified character by driving the associated anode control signal Low. Through
persistence of vision, the human brain perceives that all four characters appear
simultaneously, similar to the way the brain perceives a TV display.
AN3
AN2
AN1
AN0
{A,B,C,D,E,F,G,DP}
DISP3
DISP2
DISP1
DISP0
UG130_c3_02_042404
Figure 3-2:
Drive Anode Input Low to Light an Individual Character
This “scanning” technique reduces the number of I/O pins required for the four
characters. If an FPGA pin were dedicated for each individual segment, then 32 pins are
required to drive four 7-segment LED characters. The scanning technique reduces the
required I/O down to 12 pins. The drawback to this approach is that the FPGA logic must
continuously scan data out to the displays—a small price to save 20 additional I/O pins.
Spartan-3 FPGA Starter Kit Board User Guide
UG130 (v1.2) June 20, 2008
17
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