debug.txt

Spartan-3 Starter Board

 7 6 5 4 3 2 1 0
[* * * * * * * *]  <- Switches


 [0] ->  1 debug mode (1 Hz clock, debug data mapped to sev. seg.)
	 0 normal mode (25 MHz, program controlled data on sev sev).

[76] -> 00 R_instruction
        01 R_pc_next & "00"
        10 R_alu_res
        11 R_ram_data_read


 [5] ->  1 (31 downto 16) of debug data
         0 (15 downto 0) of debug data

 [4] -> 1 dots (7 downto 4) -> [R_pc_enable_decoder].1  [R_mctrl_cpu_pause].1  [R_loc_mctrl_select_bytes].2
        0 dots (3 downto 0) -> [R_loc_mctrl_mem_we].4