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Baud rate #3
Open ManuelStahl opened this issue over 12 years ago
ManuelStahl commented over 12 years ago

Can someone explain how the numbers are related to the comments here:

    4'b0000: clkcnt <= #1 12'h0;   // 2   -- original M68HC11 coding
    4'b0001: clkcnt <= #1 12'h1;   // 4   -- original M68HC11 coding
    4'b0010: clkcnt <= #1 12'h3;   // 16  -- original M68HC11 coding
    4'b0011: clkcnt <= #1 12'hf;   // 32  -- original M68HC11 coding
    4'b0100: clkcnt <= #1 12'h1f;  // 8
    4'b0101: clkcnt <= #1 12'h7;   // 64
    4'b0110: clkcnt <= #1 12'h3f;  // 128
    4'b0111: clkcnt <= #1 12'h7f;  // 256
    4'b1000: clkcnt <= #1 12'hff;  // 512
    4'b1001: clkcnt <= #1 12'h1ff; // 1024
    4'b1010: clkcnt <= #1 12'h3ff; // 2048
    4'b1011: clkcnt <= #1 12'h7ff; // 4096
rherveille commented over 12 years ago

The idea was to follow the original HC11 encoding, but extending the range. Then people complained it wasn't straightforward ...

So now there is a linear implementation, with comments for the HC11 compatible encoding. Somewhat a mix-up.

Set it to your own preference ...

Richard


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