diff options
| -rw-r--r-- | eater_cpu/eater_decoder.sv | 10 | ||||
| -rw-r--r-- | eater_cpu/eater_types.sv | 3 |
2 files changed, 9 insertions, 4 deletions
diff --git a/eater_cpu/eater_decoder.sv b/eater_cpu/eater_decoder.sv index 53cc39c..ba7cf16 100644 --- a/eater_cpu/eater_decoder.sv +++ b/eater_cpu/eater_decoder.sv @@ -42,9 +42,11 @@ always @(posedge clk_i) begin INIT: next_state = PC_to_MAR; - PC_to_MAR: next_state = MEM_to_INS_and_PC_inc; + PC_to_MAR: next_state = MEM_to_INS; - MEM_to_INS_and_PC_inc: next_state = insdep_state(); + MEM_to_INS: next_state = PC_inc; + + PC_inc: next_state = insdep_state(); LDA_INS_to_MAR: next_state = LDA_MEM_to_A; LDA_MEM_to_A: next_state = PC_to_MAR; @@ -82,9 +84,11 @@ always_comb begin internal_flags.PC_out = 1; internal_flags.MAR_in = 1; end - MEM_to_INS_and_PC_inc: begin + MEM_to_INS: begin internal_flags.RAM_out = 1; internal_flags.INS_in = 1; + end + PC_inc: begin internal_flags.PC_count = 1; end diff --git a/eater_cpu/eater_types.sv b/eater_cpu/eater_types.sv index 57a7adc..6098744 100644 --- a/eater_cpu/eater_types.sv +++ b/eater_cpu/eater_types.sv @@ -8,7 +8,8 @@ typedef enum logic[7:0] { // "regular" states INIT, PC_to_MAR, - MEM_to_INS_and_PC_inc, + MEM_to_INS, + PC_inc, // instruction dependent states |