Tagged Questions

stands for Video Graphics Array and provides a 640x820 screen resolution.

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0
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0answers
14 views

PC BIOS and VGA BIOS interconnection [migrated]

I have 386 PC clone computer with BIOS EPROM. And I have VGA ISA board with it's own EPROM BIOS. I want to know how main BIOS interconnects with VGA BIOS. Does main BIOS calls (jumps to execute) VGA ...
0
votes
1answer
69 views

Solid color display on VGA not working

I'm trying to get VGA working on my Altera DE0 board using Verilog, but haven't had much luck. It has the same pins as a normal VGA interface except red, green, and blue are all 4 bits each. Here is ...
1
vote
2answers
85 views

How VGA monitor detects video resolution?

How VGA monitor detects video resolution. I'm asking this because with different VSYNC, HSYNC intervals it's possible to have different dot clock.
1
vote
0answers
68 views

VGA to Ethernet [closed]

I am using VGA to Ethernet Frame grabbers for my job. I need a VGA to Ethernet frame grabber which is like the Epiphan's product on the internet(it can be easily found when searched in the internet). ...
0
votes
0answers
55 views

Problem in connecting a VGA socket to a LED projector

I am building a mini LED projector. I have obtained the following parts from an old and used projector: 1) RGB LED box: 2) Himax signal processing card: Now, I want to connect a VGA port to ...
3
votes
1answer
269 views

having distorted image in VGA with FPGA board

I'm using spartan 3E-100 CP132 fpga board to display a basic plus image on a monitor. I have tried using 800x600 72 hz and 640x480 60 Hz but I always get a distorted vertical lines. Is it because the ...
0
votes
1answer
165 views

generating 40 mhz clock from 50 MHz

In VHDL how can I get a clock frequency of 40 MHz if my onboard clock is 50 MHz. I know how to divide the frequency by integers but this case is dividing by 1.25. I am using this for VGA so I think ...
0
votes
1answer
124 views

generating 40 MHz clock from 50 MHz in VHDL [duplicate]

In VHDL how can I get a clock frequency of 40 MHz if my onboard clock is 50 MHz. I know how to divide the frequency by integers but this case is dividing by 1.25. I am using this for VGA so I think ...
1
vote
1answer
71 views

MPU accessing busy memory

I didn't know whether to place this question here or on stackoverflow, but I finally decided to post it here. I want to build a simple system that would be able to work with basic peripherals (UART, ...
0
votes
1answer
550 views

SCART to VGA adapter - green picture

I want to connect my DVD player which has a SCART output to a computer LCD monitor with VGA input. The DVD player supports the Progressive scan mode. It supports both PAL and NTSC. I've built this ...
3
votes
4answers
188 views

Is quality of VGA Horizontal and Vertical sync Pulse relevant to be able to display on sensitive projectors

I am currently trying to diagnose a VGA problem on hardware A. Hardware A has some trouble sending display to certain projectors (while it is able to send display on most LCD monitors). Hardware B ...
0
votes
2answers
239 views

VGA driver in VHDL displays only black

Goal & Data I am trying to make a VGA driver on a Spartan 6 (Embedded Micro Mojo board) to display something simple like the french flag on an LCD monitor, in 640x480 8 colors. I live in Europe ...
1
vote
1answer
96 views

VGA switch 3 in 1 out [closed]

My team and I are going on a software development competition in 1 week. We will demonstrate the software on multiple laptops, but we have only one projector. So we need to be quickly able to switch ...
0
votes
0answers
34 views

Standard range for monitor gamma?

I'm designing a gamma correction stage on an FPGA that will drive VGA monitors. I looked at the EDID info and saw that the legal values for monitor gamma are between 1 and 3.54: ...
0
votes
2answers
185 views

VGA repeater/extender circuit

Apparently noone ever needed anything like this on the internet because I was not able to find any example, so I hope this will become the reference question. I need to repeat a vga 800x600 signal up ...
4
votes
1answer
142 views

Can the DS1052E be used for reliable NTSC measurement?

I'm in the market for an oscilloscope. I've read that the infamous DS1052E from Rigol is a great beginner scope due to the price/performance. However, I know I have a lot to learn and simply don't ...
4
votes
1answer
201 views

How does a computer signal via VGA for the monitor to sleep [closed]

Could somebody please explain how a "modern" monitor is told to sleep. I need to know this for a VGA with blue connector, i.e. it has DDC. I've heard that the sync stops. If true, which sync? ...
2
votes
0answers
250 views

How to implement memory mapped IO

I am describing a system in VHDL. This system already contains a processor, a DDR SDRAM controller and a VGA controller. VGA reads pixels from SDRAM (already validated and proven in FPGA). Although ...
2
votes
0answers
153 views

Debugging VGA signal

I have tried to use my Open bench logic sniffer to capture data from a VGA output. I'm pretty sure I understand how the waveform should look, but I not getting consistent data. It feels very shaky to ...
1
vote
2answers
11k views

Soldering a VGA cable - number of wires doesn't match [closed]

I decided to open up a VGA cable which started to produce only red / blue / green colored image. I thought that inside I will find something like shown on this scheme: Instead I found that my VGA ...
6
votes
1answer
526 views

VGA Decoding - Dealing with tolerances

Update: The VGA Simulator is up and running. You can go simulate your own designs or just use the example file to see it working. I also wrote a blog post to help anyone get started using it for ...
-1
votes
1answer
123 views

How digital video is processed? [closed]

I'm not sure if I'm using the right words, but I would like to learn how digital video works. I have a book that explains how VGA works and how to implement it on FPGA. I would like to know what kind ...
-2
votes
1answer
598 views

Problem with warnings in Xilinx tools [closed]

I am interfacing a VGA monitor with Spartan 3e kit. I have a problem in the code and I'm getting many warnings, as shown below. Could anyone explain the warnings? ...
3
votes
1answer
2k views

Do-It-Myself KVM?

I have several computers (desktops) in different geographical locations that I want to access remotely. Commercial KVM-over-IP solutions that I found are expensive (more than 200 euros each) and the ...
1
vote
2answers
374 views

16 bit RGB to vga converter circuit

Can anyone please suggest a circuit to convert 16 bit TTL (3.3V) RGB signal to a VGA signal. I used a resistor network, it works but I think some active component is necessary for load matching ...
0
votes
0answers
300 views

Read VGA pixel value from SRAM in VHDL

I'm using a SRAM in order to store a frame that I have to display on screen with the VGA interface. I need to read the pixel value from the SRAM and then send it to the VGA monitor. I have created a ...
-2
votes
1answer
125 views

I want to connect an HDMI mini out (on my tablet) to a VGA input in a 'smart room' that I teach in-how? [closed]

I want to connect my Asus tablet mimi HDMI to a VGA in a 'smart room' that I teach in. Can I do this so I can show art work, play you tube videos, and recorded music and PDF's on the big screen in the ...
-3
votes
1answer
113 views

displaying JPEG images [closed]

I want to display images(JPEG) stored in a SD card, I want the output to be VGA so that I can display them in readily available display modules. Any idea on how this can be done?
4
votes
1answer
640 views

Is there an FPGA based vector graphics card project?

I have been messing around with VGA projects as my latest interest. I have a Xilinx Spartan 3E 250K FPGA, which has just barely too little RAM for a full 640x480 frame buffer. So, I'm looking at ...
2
votes
3answers
154 views

Video Controller Design

I'm designing my own computer based on the Zilog Z80. It has 256KiB of static RAM with paging as well as a few megabytes of flash memory. Everything is going along pretty well until * BAM * I hit a ...
-5
votes
1answer
116 views

Need for a VGA output [closed]

My device must be able to show a simple diagram on a screen of an ordinary computer monitor. I've found display drivers which could do the job, but they seem to be much more sophisticated than I would ...
4
votes
2answers
441 views

Trouble with VGA Controller on CPLD

What I am attempting to do is create a VGA controller from a Lattice MachXO CPLD in Verilog. The Problem I am attempting to display the color red with a resolution of 640x480 @ 60Hz using a 25.175 ...
0
votes
3answers
566 views

Vhdl VGA Problem

I'm doing a fpga project in vhdl for my studies. I'm displaying a dog on the screen that I try to move. That works well for right, left and up but trying to make the dog go down, it moves in a ...
3
votes
2answers
199 views

What impedances do graphics cards expect on H-Sync and V-Sync for VGA monitors?

I have a graphics card for a laptop whose driver kills itself if it runs for longer than two minutes with no external monitor attached. To solve that, I decided to make a sort of dummy plug that would ...
6
votes
3answers
2k views

VGA interfacing with PIC

I'm looking for a way to control a VGA screen with a PIC. External components are OK, so a VGA chip with I2C or SPI or something is okay too. Requirements: Resolution: max 1024x768, no minimum ...
5
votes
4answers
743 views

Can we attach LED to VGA port and make it light up, the same way we do in Parallel Port?

I just connected an LED to a parallel port in my PC and controlled it successfully through inpout32.dll I was wondering, if it was possible to do the same with the VGA port. Where can I find ...
3
votes
2answers
352 views

Custom VGA output : what resolutions are expected to work?

I am thinking of creating a device which displays graphics and animation to generic computer display with 16:9 aspect ratio via analog interface (D-sub). The question is which resolutions are ...
2
votes
2answers
900 views

male-male VGA cable wiring

I need to build a VGA cable (assemble connectors to wire). I need a male-male cable. Is its wiring straight or cross? (should i connect 1-1,2-2,... or something else) Thanks
6
votes
2answers
291 views

Does VGA have to be drawn at 60hz?

I'm wanting to generate a VGA signal hopefully as painlessly as possible. I have an odd question though. Everywhere I see that VGA requires a 25MHz clock for the sync signals. Is it possible to ...
2
votes
1answer
1k views

image distortion generating VGA signal on STM32 f4 using DMA

I'm trying to build a video generator using the STM32f4 (168MHz, using discovery board) + R ladder DAC to the VGA signal. The idea is not to be based on a framebuffer (this would limit the resolution ...
3
votes
1answer
2k views

What is the acceptable current draw on pin #9 on a VGA connector?

I'm trying to appropriate the 5v that comes into an LCD monitor on pin #9 of a VGA connector to power a microcontroller with some sensors, and LEDs. I've found a discussion on this topic on a ...
4
votes
2answers
836 views

How to make a VGA monitor display a white screen at all time?

I am hacking around with an old (CRT) VGA monitor. Trying to make an oscilloscope. What I want is to make the monitor display a blank white screen at all time, when the power is connected of course. ...
-1
votes
1answer
723 views

Use laptops monitor on another computer [closed]

I just bought a new pc, but i dont have a monitor yet. Is it posible to use my old laptops (omnibook 3000) monitor with VGA cable? Added: Options Old PC working as a PC - just connect somehow - ...
6
votes
3answers
5k views

How to utilize HDMI port on FPGA (basic)

Two questions. I have a Xilinx Spartan 6 FPGA which only has HDMI ins and outs. Is there some sort of guide or pre-written code that I can use to start sending images to the screen? I have no idea ...
5
votes
1answer
477 views

Other name for VGA socket?

I need a VGA socket for my project (preferably PCB mounted but that's not reevent probably). But I can't find such a thing at any of my usual suppliers. I presume they have some other name I need to ...
4
votes
3answers
1k views

What's the simplest way to generate a VGA signal for a totally white screen? Preferably with an AVR MCU

I'd like to make a simple board to plugin a LCD monitor and get a blank white screen. The idea is to use any monitor as a makeshift light table. I have a preference for 8-bit AVR micros since I have a ...
5
votes
2answers
4k views

FPGA VGA Buffer. How to read and write?

I have an Altera DE2 board and trying to draw sprites. I am having some trouble implementing a screen buffer. I have a display entity that at a 25 MHZ rate outputs pixels for vga display. I was ...
1
vote
0answers
772 views

NTSC -> ADC -> USB. A video digitzer circuit

I'm working on a project that ultimately needs to incorporate an analog video camera input, digitizing it and spitting it out a USB port as an MPEG stream. My general aim is for roughly a VGA ...
6
votes
5answers
2k views

VGA to HDMI converter

I'm making a little project purely as a hobby using a small FPGA breakout board. I'm outputting VGA video which works fine, but would like HDMI output instead so I can connect to a television that has ...
7
votes
5answers
441 views

Spacewar on microcontroller

First of all I need to say that I have almost no experience with programming microcontrollers (aside for some Arduino stuff). I have worked with C (and x86 ASM) on some low level projects (think of ...