Memory Access Time for 1024x768 bitmap?
Alex78
Posts: 2
What access time is it possible to choose memory with, to load a background picture? And farther to work in the character mode.
p.s. Memory will be filled an external comptroller.
p.s. Memory will be filled an external comptroller.
Comments
Thus a background picture is loaded in separate memory and not·changed during work, but text strings loaded in other memory and can will change during work.
If calculation time of output data to display: 1024x768 = 786432 bytes x 75Hz = 58982400 = 59Mb per second. ????? Propeller is not die?
If you want to mix text and background using the Propeller as the primary controller, then the text memory and the rendering of the text would need to be on the Propeller which is easily doable with the existing internal memory. You would need the external memory for the background and the FPGA could do the combining of the pixel data from the Propeller with the background memory bytes to produce the digital pixel stream. The Propeller could provide the pixel clock as well as signals to set the initial pixel address during the horizontal and vertical retrace times.
http://www.multilabs.net/ezVGA.html
this chip can only control a resolution of 320 x 240 at 64 colors. That's what a Propeller can do better.