Re: [oc] Video controller core

[Richard Herveille <richard@asics.ws>]

Hi all,

I just stumbled on this old thread. Seems like OpenCores has the 
ingredients for it.
Combining the PCI bridge with the vga_lcd controller and the 
i2c_master_core (for DDC) should provide the functionality described 
(except for the 3D acceleration). Although the hardware cursors do support 
3D effects. I am finalizing the hardware cursor designs now. If somebody is 
interested I can send an updated datasheet/specs.document.

Richard


> >
> > Just read some of the messages about building a video controller
> > core.
> >
> > I have done some work on the other side of the aisle... writing
> > Linux
> > kernel video device drivers.
> >
> > Here are some ideas about video cores:
> >
> > For ultra-low-cost embedded, CGA is the best choice.
> >
> > If compatibility is a concern at all, though, it is much smarter to
> > develop a VGA core.  VGA is pretty much universally supported.
> >
> > But if you want to develop a GOOD video core.......
> >
> > * Lives on a PCI or AGP bridge
> >
> > * All 32-bit registers, 100% memory-mapped I/O (MMIO)
> >
> > * Registers can optionally live in a DMA command buffer.  This is a
> > ring
> > buffer of register reads and writes, which the video chip processes
> > asynchronously.
> >
> > * NO VGA compatibility.  NO text mode.  These can be emulated in
> > BIOS or
> > other software.
> >
> > * Integrated *DRAM controller, as the video chip must keep tight
> > control
> > over both video clocks and memory clocks
> >
> > * Standard set of 2D accels:  fills, blits (fb/DMA mem -> fb/DMA
> > mem
> > copy), etc.
> >
> > * VESA features like DDC, power management
> >
> > If someone is ambitious, this design can extended to support 3D ---
> > without changing any of the chip features/logic above.  In most 3D
> > chip
> > designs, 3D is seamlessly layered on top of 2D, and is very cheap
> > to add
> > to the design.
> >
> >
> >
> > --
> > Jeff Garzik              | "Are you the police?"
> > Building 1024            |
> > MandrakeSoft, Inc.       | "No ma'am.  We're musicians."
> >
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