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What can be done with 66 Mhz bandwidth?
- What can be done in 4 * 2.8ms => 11.2 ms?
Assume I want to read each pixel, modify it, write it in one screen refresh time.
- If I assume no pipelining of operations, but this operation is done by attached accelerator, then will take 3 clocks (1 clk read, 1 clk op, 1 clk write)
- 83 Mhz => 12 ns
- 256K pixels * 12 ns * 3 => 9.5 ms
- Plenty of time!!!! Still have 1.7 ms left over!
Double buffering would help, then I would have:
- 10 SGRAM chips, 9 * 2.8 ms => 25.2 ms