diff options
Diffstat (limited to 'ntoa.sv')
| -rw-r--r-- | ntoa.sv | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/ntoa.sv b/ntoa.sv deleted file mode 100644 index 6da1baf..0000000 --- a/ntoa.sv +++ /dev/null | |||
| @@ -1,90 +0,0 @@ | |||
| 1 | `include "utils.svh" | ||
| 2 | |||
| 3 | module ntoa | ||
| 4 | #( BITS = 8 | ||
| 5 | , BASE = 10 | ||
| 6 | , BASE_BITS = $clog2(BASE) | ||
| 7 | , DIGITS = 3 // should be ceil[log(2**BITS) base BASE] which is hard to do in Verilog :-( | ||
| 8 | ) | ||
| 9 | ( input bit clk | ||
| 10 | , input bit reset | ||
| 11 | |||
| 12 | , output bit n_ready | ||
| 13 | , input bit n_valid `define n_valid `past(n_valid) | ||
| 14 | , input bit [BITS-1:0] n_data `define n_data `past(n_data) | ||
| 15 | |||
| 16 | , input bit a_ready `define a_ready `past(a_ready) | ||
| 17 | , output bit a_valid | ||
| 18 | , output bit [7:0] a_data | ||
| 19 | ); | ||
| 20 | |||
| 21 | bit bcd_ready; | ||
| 22 | bit bcd_valid; | ||
| 23 | bit [DIGITS-1:0][BASE_BITS-1:0] bcd_data; | ||
| 24 | |||
| 25 | bin2bcd | ||
| 26 | #( .BITS(BITS) | ||
| 27 | , .BASE(BASE) | ||
| 28 | , .BASE_BITS(BASE_BITS) | ||
| 29 | , .DIGITS(DIGITS) | ||
| 30 | ) b2b | ||
| 31 | ( .clk(clk) | ||
| 32 | , .reset(reset) | ||
| 33 | |||
| 34 | , .bin_ready(n_ready) | ||
| 35 | , .bin_valid(n_valid) | ||
| 36 | , .bin_data(n_data) | ||
| 37 | |||
| 38 | , .bcd_ready(bcd_ready) | ||
| 39 | , .bcd_valid(bcd_valid) `define bcd_valid `past(bcd_valid) | ||
| 40 | , .bcd_data(bcd_data) `define bcd_data `past(bcd_data) | ||
| 41 | ); | ||
| 42 | |||
| 43 | bit bcd_b_valid; | ||
| 44 | bit [DIGITS-1:0][BASE_BITS-1:0] bcd_b_data; | ||
| 45 | |||
| 46 | bit [$clog2(DIGITS):0] work; | ||
| 47 | |||
| 48 | always_ff @(posedge clk) begin | ||
| 49 | if (reset) begin | ||
| 50 | a_valid = 0; | ||
| 51 | bcd_ready = 0; | ||
| 52 | bcd_b_valid = 0; | ||
| 53 | end else begin | ||
| 54 | if (bcd_ready && `bcd_valid) begin | ||
| 55 | bcd_b_valid = 1; | ||
| 56 | bcd_b_data = `bcd_data; | ||
| 57 | // verilator lint_off WIDTH | ||
| 58 | work = DIGITS; | ||
| 59 | // verilator lint_on WIDTH | ||
| 60 | for (int i = 0; i < DIGITS - 1; ++i) begin | ||
| 61 | if (bcd_b_data[DIGITS-1] != 0) break; | ||
| 62 | bcd_b_data = { bcd_b_data[DIGITS-2:0], {BASE_BITS{1'b0}} }; | ||
| 63 | --work; | ||
| 64 | end | ||
| 65 | end | ||
| 66 | |||
| 67 | if (`a_ready) a_valid = 0; | ||
| 68 | if (!a_valid && bcd_b_valid) begin | ||
| 69 | if (work != 0) begin | ||
| 70 | a_valid = 1; | ||
| 71 | // verilator lint_off WIDTH | ||
| 72 | if (bcd_b_data[DIGITS-1] < 10) | ||
| 73 | a_data = "0" + bcd_b_data[DIGITS-1]; | ||
| 74 | else | ||
| 75 | a_data = "a" + bcd_b_data[DIGITS-1] - 10; | ||
| 76 | // verilator lint_off WIDTH | ||
| 77 | bcd_b_data = { bcd_b_data[DIGITS-2:0], {BASE_BITS{1'b0}} }; | ||
| 78 | --work; | ||
| 79 | end else begin | ||
| 80 | a_valid = 1; | ||
| 81 | a_data = ","; | ||
| 82 | bcd_b_valid = 0; | ||
| 83 | end | ||
| 84 | end | ||
| 85 | |||
| 86 | bcd_ready = !bcd_b_valid; | ||
| 87 | end | ||
| 88 | end | ||
| 89 | |||
| 90 | endmodule | ||
