So as my last couple posts alluded to, I’ve been having problems with my DRAM-based design. My controller isn’t dual-port. And I’ve been trying to wrap my head around a time-slot method for arbitration...
Archive - 2011
on memory controller optimization
So I’ve been trying to optimize a freeware memory controller for my particular memory chip. I’m running into this situation where the DRAM to ALTRAM copy takes upwards of 24us per line. But I only have a...
maybe a big problem, memory arbitration on FPGAs
So far, I’ve been using a user-selectable mux, with a physical switch, to control which process is connected to the single-port memory controller. If the switch is in one position, you can upload via USB a...
my level converter board with lcx245’s
I put this together last night. It takes the amiga 5v video signals in on the right hand side and then outputs 3.3v to IDC40-pin connector that connects to the FPGA board. Once I build my header cables, they will plug...
more ordering of parts, soldered pins for lcx245 parts
So I was looking everywhere for a female-female header cable that has the right number of pins, to basically interface the Denise IC DIP Clip to my level converting solderless breadboard. I couldn’t seem to find...
video showing current progress
I posted a video to youtube a little while ago showing my progress. It’s a little long winded (surprise surprise for those who read my posts) but it shows basically the framebuffer portion of the hardware working...
on converting amiga video from 320×200 to 640×400
I had mentioned on the VSC project description page that I am looking at various methods for scaling my digital amiga video output from 320×200 to 640×400. My initial plan was just to do pixel doubling, or...
sampled some TI chips and bought some surfboards
One of the minor hurdles that I have to deal with is how to connect the output from the amiga video, which is 5v to the FPGA at 3.3v. I was originally going to do a custom circuit board but that has turned into a pain...