参数资料
型号: HW-SPAR3AN-SK-UNI-G
厂商: Xilinx Inc
文件页数: 60/140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 6: VGA Display Port
R
flows through the deflection coils, and it ensures that pixel or video data is applied to the
electron guns at the correct time.
Video data typically comes from a video refresh memory with one or more bytes assigned
to each pixel location. The Spartan-3A/3AN Starter Kit board uses 12 bits per pixel,
producing one of the 4,096 possible colors. The controller indexes into the video data buffer
as the beams move across the display. The controller then retrieves and applies video data
to the display at precisely the time the electron beam is moving across a given pixel.
As shown in Figure 6-2 , the VGA controller generates the horizontal sync (HS) and vertical
sync (VS) timing signals and coordinates the delivery of video data on each pixel clock. The
pixel clock defines the time available to display one pixel of information. The VS signal
defines the refresh frequency of the display, or the frequency at which all information on the
display is redrawn. The minimum refresh frequency is a function of the display’s phosphor
and electron beam intensity, with practical refresh frequencies in the 60 Hz to 120 Hz
range. The number of horizontal lines displayed at a given refresh frequency defines the
horizontal retrace frequency.
VGA Signal Timing
The signal timings in Table 6-2 are derived for a 640-pixel by 480-row display using a
25 MHz pixel clock and 60 Hz ± 1 refresh. Figure 6-3 shows the relation between each of
the timing symbols. The timing for the sync pulse width (T PW ) and front and back porch
intervals (T FP and T BP ) is based on observations from various VGA displays. The front and
back porch intervals are the pre- and post-sync pulse times. Information cannot be
displayed during these times.
Table 6-2:
640x480 Mode VGA Timing
Vertical Sync
Horizontal Sync
Symbol
Parameter
Time
Clocks
Lines
Time
Clocks
T S
T DISP
T PW
T FP
T BP
Sync pulse time
Display time
Pulse width
Front porch
Back porch
16.7 ms
15.36 ms
64 μs
320 μs
928 μs
416,800
384,000
1,600
8,000
23,200
521
480
2
10
29
32 μs
25.6 μs
3.84 μs
640 ns
1.92 μs
800
640
96
16
48
T S
T pw
T disp
T fp
T bp
UG230_c6_03_021706
Figure 6-3:
VGA Control Timing
Generally, a counter clocked by the pixel clock controls the horizontal timing. Decoded
counter values generate the HS signal. This counter tracks the current pixel display
location on a given row.
60
www.xilinx.com Spartan-3A/3AN FPGA Starter Kit Board User Guide
UG334 (v1.1) June 19, 2008
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