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Code violation and sync bit

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This commit is contained in:
Andrew Kay
2020-02-08 19:03:04 -06:00
parent 9faae78fd8
commit b9ed29bd4b
1 changed files with 17 additions and 1 deletions
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18
interface2/rtl/coax_tx.v
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@@ -16,6 +16,10 @@ module coax_tx (
localparam LINE_QUIESCE_4 = 5;
localparam LINE_QUIESCE_5 = 6;
localparam LINE_QUIESCE_6 = 7;
localparam CODE_VIOLATION_1 = 8;
localparam CODE_VIOLATION_2 = 9;
localparam CODE_VIOLATION_3 = 10;
localparam SYNC_BIT = 11;
reg [$clog2(CLOCKS_PER_BIT):0] bit_counter = 0;
@@ -40,7 +44,11 @@ module coax_tx (
LINE_QUIESCE_3: next_state <= LINE_QUIESCE_4;
LINE_QUIESCE_4: next_state <= LINE_QUIESCE_5;
LINE_QUIESCE_5: next_state <= LINE_QUIESCE_6;
LINE_QUIESCE_6: next_state <= IDLE;
LINE_QUIESCE_6: next_state <= CODE_VIOLATION_1;
CODE_VIOLATION_1: next_state <= CODE_VIOLATION_2;
CODE_VIOLATION_2: next_state <= CODE_VIOLATION_3;
CODE_VIOLATION_3: next_state <= SYNC_BIT;
SYNC_BIT: next_state <= IDLE;
endcase
end
end
@@ -70,6 +78,14 @@ module coax_tx (
if (state >= LINE_QUIESCE_1 && state <= LINE_QUIESCE_6)
tx <= bit_first_half ? 0 : 1;
else if (state == CODE_VIOLATION_1)
tx <= 0;
else if (state == CODE_VIOLATION_2)
tx <= bit_first_half ? 0 : 1;
else if (state == CODE_VIOLATION_3)
tx <= 1;
else if (state == SYNC_BIT)
tx <= bit_first_half ? 0 : 1;
end
assign active = (state != IDLE);