On Sat, 15 Jul 2006 23:52:46 +0200, Timothy Miller <[EMAIL PROTECTED]>
wrote:
This video controller is like a microcontroller of sorts. Each
instruction corresponds to four pixels (or the equivalent time
period). The RAM is read in the video clock domain, because that's
the time domain that program has to run in. The RAM is written in the
PCI domain, because that's how you load it with a program.
Thank you for you answer,
I kind of suspected the the controller was some kind of MCU, i just didnt
knew what it was used for. Reading the latest post my best guess was that
it is used to generate sync signals and/or to feed the DACs with pixels.
Now, my question about the rams was really about this part of your code:
RAMB16_S36_S36 cram0 (
.DOA(cram_bits[0:31]), .DOPA(),
.DOB(cram_bits[32:63]), .DOPB(), <-- cram_bits[32:63] read
@pci_clock
.ADDRA({1'b0, cursor_addr}), .CLKA(vid_clock),
.DIA(32'b0), .DIPA(4'b0),
.DIB(reg_write_data), .DIPB(4'b0),
.ADDRB(reg_write ? reg_write_addr[8:0] : {1'b1, cursor_addr}), <--
cursor_addr sampled @pci_clock
.CLKB(pci_clock), <--
pci_clock
.ENA(1'b1), .SSRA(1'b0),
.ENB(1'b1), .SSRB(1'b0),
.WEA(1'b0), .WEB(reg_write && !reg_write_addr[9]));
I assume that cram_bits and cursor_addr are in the vid_clock clock doman.
Given that the two clocks are unrelated (AFAIK), I cant see how port-B
reads work here.
----------------------------------
on another unrelated subject, here is my list of _other_ things to do with
OGD1. some of them have guaranteed high "geek factor".
1. Your own shiny new RSIC CPU. or why not create your own PDP-11?
2. soundcards? forget that, I want a real music synthesizer. how about a
really fast and accurate emulation of mini-moog??
3. password cracker - for those of you with illegal nighttime activities ;)
4. Hardware Distibuted.Net or [EMAIL PROTECTED] clients (so your host CPU is not
running 100% and consumes 300W/hour on a totally pointless activity :)
5. retro-computing: how about a complete cycle-accurate C64, Sinclair or
even an Amiga?? What about finally being able to afford a Neo Geo system?
6. why not create your own VPN link with 8192-bit RSA or 4387-bit elliptic
curve encryption?
7. of course some of above can co-exist with a "lighter" graphic code. for
example, at startup you may choose between 3D-accelerated graphics or
simple 1024x768 SVGA graphics plus [EMAIL PROTECTED] client :)
8. run your own uc-linux system on the board!
9. real time DivX encoding of your DVD?
10. put a LEON sparc in there and off load your main CPU.
Well, hope i didnt steal attention from the project, these are just some
crazy ideas I had for getting you slashdotted :)
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