URL
https://opencores.org/ocsvn/ha1588/ha1588/trunk
Subversion Repositories ha1588
Compare Revisions
- This comparison shows the changes necessary to convert path
/ha1588/trunk/rtl/rtc
- from Rev 15 to Rev 19
- ↔ Reverse comparison
Rev 15 → Rev 19
/rtc.v
50,28 → 50,31
end |
end |
|
wire [39:0] time_adj_08n_32f; // 39:32 ns, 31:0 ns_fraction |
reg [39:0] time_adj_08n_32f; // 39:32 ns, 31:0 ns_fraction |
wire [15:0] time_adj_08n_08f; // 15: 8 ns, 7:0 ns_fraction |
reg [23:0] time_adj_00n_24f; // 23:0 ns_fraction |
// delta-sigma circuit to keep the lower 24bit of time_adj |
assign time_adj_08n_32f = time_adj[39: 0] + {16'd0, time_adj_00n_24f}; // sigma the delta part |
always @(posedge rst or posedge clk) begin // keep the delta part |
always @(posedge rst or posedge clk) begin |
if (rst) begin |
time_adj_08n_32f <= 40'd0; |
time_adj_00n_24f <= 24'd0; |
end |
else begin |
time_adj_00n_24f <= time_adj_08n_32f[23: 0]; |
time_adj_08n_32f <= time_adj[39: 0] + {16'd0, time_adj_00n_24f}; // add the delta |
time_adj_00n_24f <= time_adj_08n_32f[23: 0]; // save the delta |
end |
end |
assign time_adj_08n_08f = time_adj_08n_32f[39:24]; // output w/o the delta part |
assign time_adj_08n_08f = time_adj_08n_32f[39:24]; // output w/o the delta |
|
reg [37:0] time_acc_30n_08f; // 37:8 ns , 7:0 ns_fraction |
reg [47:0] time_acc_48s; // 47:0 sec |
reg time_acc_48s_inc; |
// time accumulator (48bit_s + 30bit_ns + 8bit_ns_fraction) |
always @(posedge rst or posedge clk) begin |
if (rst) begin |
time_acc_30n_08f <= 38'd0; |
time_acc_48s <= 48'd0; |
time_acc_48s_inc <= 1'b0; |
end |
else begin |
if (time_ld) begin // direct write |
78,13 → 81,25
time_acc_30n_08f <= time_reg_ns_in; |
time_acc_48s <= time_reg_sec_in; |
end |
else if (time_acc_30n_08f + {22'd0, time_adj_08n_08f} >= time_acc_modulo) begin |
time_acc_30n_08f <= time_acc_30n_08f + {22'd0, time_adj_08n_08f} - time_acc_modulo; |
time_acc_48s <= time_acc_48s + 1; |
end |
else begin |
time_acc_30n_08f <= time_acc_30n_08f + {22'd0, time_adj_08n_08f}; |
time_acc_48s <= time_acc_48s; |
|
if (time_acc_30n_08f + {22'd0, time_adj_08n_08f} >= time_acc_modulo) |
time_acc_30n_08f <= time_acc_30n_08f + {22'd0, time_adj_08n_08f} - time_acc_modulo; |
else |
time_acc_30n_08f <= time_acc_30n_08f + {22'd0, time_adj_08n_08f}; |
|
if (time_acc_48s_inc) |
time_acc_48s_inc <= 1'b0; |
else if (time_acc_30n_08f + {22'd0, time_adj_08n_08f} + {22'd0, time_adj_08n_08f} >= time_acc_modulo) |
time_acc_48s_inc <= 1'b1; |
else |
time_acc_48s_inc <= 1'b0; |
|
if (time_acc_48s_inc) |
time_acc_48s <= time_acc_48s + 1; |
else |
time_acc_48s <= time_acc_48s; |
|
end |
end |
end |