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Recent content by RRRED

  1. R

    How I can read/write to the following blockram RAM model ?

    Re: Block RAM Any ideias? Little explanation: It is a SoC based on Z80. When Z80 writes to RAM, it must be above 0x2000h. When it reads, it can be ROM (0x0000h to 0x1FFFh), or RAM (above 0x2000h). In the simulation (only the RAM model, not the full SoC), the read operations returned the...
  2. R

    Where do I get an affordable FPGA board,I'm a German Student

    I would go and check digikey. They deliver in Europe, from local offices. No need to pay import taxes.
  3. R

    How I can read/write to the following blockram RAM model ?

    Re: Block RAM Thank you for the file. But I need a RAM for video buffer. It must have different ports and control signals for read / write operations. thanks.
  4. R

    help to create picture on memory and display on vga monitor

    Re: help to create picture on memory and display on vga moni My project is based on the book "Rapid Prototyping of Digital Systems, SOPC EDITION". They cover all of this, from VGA signal generation to character displays and video ram memory. You can find a similar project here: **broken link...
  5. R

    How I can read/write to the following blockram RAM model ?

    Hello, Can someone point me out how I can read/write to the following blockram RAM model ? I can read and write to external SRAM, but I am not able to make this work using blockram. Could someone help? ENTITY vram8k IS PORT ( data : IN STD_LOGIC_VECTOR (7 DOWNTO 0); rdaddress : IN...
  6. R

    help to create picture on memory and display on vga monitor

    Re: help to create picture on memory and display on vga moni I cannot help you much with this, but can give some clues as I am working with video and ram video right now. To display some picture on video, you could use a ROM with the pattern. For altera, this can be acomplished defining some...
  7. R

    IO on Z80 SoC - Buffer it or not to Buffer it ?

    z80 altera de1 UP. Not one comment or answer? thanks.
  8. R

    IO on Z80 SoC - Buffer it or not to Buffer it ?

    soc buffer Hello, I am working on this Z80 SoC running on Altera DE1 board. So far, all leds, switches, keys and 7 segment displays can be addressed using IN/OUT commands. The computer has a ROM for the user program, and the SRAM for storing data. I did not test the gpio pins. My question is...
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