VDMA tests

Ok, so I confirmed what others have tested: vdma is somewhere between 81-85 WORDs per scanline in 5.37mhz mode. So in 10.74mhz mode, that’s 330+ bytes per scanline. The more you clipped active display, the more bandwidth you get for vdma. I did a 209 line display and was able to transfer 17.6+ kbytes during vblank. This is perfect for the bitmap mode and all that I’ve talked about in that regards (free buffer clear, free transfer for double buffer system, etc).

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One Response to “VDMA tests”

  1. TOUKO:
    Yes and imagine with SGX, 34ko with 2 VDMA at same time 😉
    The bad think,is we cannot transfert between the two VDC with VDMA 😦

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