diff options
Diffstat (limited to 'timing')
| -rw-r--r-- | timing/time_sync.v | 43 |
1 files changed, 31 insertions, 12 deletions
diff --git a/timing/time_sync.v b/timing/time_sync.v index 990674c61..04999190b 100644 --- a/timing/time_sync.v +++ b/timing/time_sync.v @@ -18,6 +18,7 @@ module time_sync wire tick_free_run; reg tick_int_enable, tick_source, external_sync; reg [31:0] tick_interval; + reg sync_on_next_pps; // Generate master time always @(posedge sys_clk_i) @@ -25,6 +26,8 @@ module time_sync master_time <= 0; else if(external_sync & sync_rcvd) master_time <= master_time_rcvd + delta_time; + else if(pps_ext & sync_on_next_pps) + master_time <= 0; else master_time <= master_time + 1; assign master_time_o = master_time; @@ -42,7 +45,10 @@ module time_sync .exp_pps_in(exp_pps_in) ); assign ack_o = stb_i; - + wire wb_write = cyc_i & stb_i & we_i; + wire wb_read = cyc_i & stb_i & ~we_i; + wire wb_acc = cyc_i & stb_i; + always @(posedge wb_clk_i) if(rst_i) begin @@ -52,17 +58,30 @@ module time_sync tick_interval <= 100000-1; // default to 1K times per second delta_time <= 0; end - else if(stb_i & we_i) - if(adr_i[2:0] == 2) - delta_time <= dat_i; - else if(adr_i[2:0] == 1) - tick_interval <= dat_i; - else - begin - tick_source <= dat_i[0]; - tick_int_enable <= dat_i[1]; - external_sync <= dat_i[2]; - end + else if(wb_write) + case(adr_i[2:0]) + 3'd0 : + begin + tick_source <= dat_i[0]; + tick_int_enable <= dat_i[1]; + external_sync <= dat_i[2]; + end + 3'd1 : + tick_interval <= dat_i; + 3'd2 : + delta_time <= dat_i; + 3'd3 : + ; + // Do nothing here, this is to arm the sync_on_next + endcase // case(adr_i[2:0]) + + always @(posedge sys_clk_i) + if(rst_i) + sync_on_next_pps <= 0; + else if(pps_ext) + sync_on_next_pps <= 0; + else if(wb_write & (adr_i[2:0] == 3)) + sync_on_next_pps <= 0; always @(posedge sys_clk_i) if(internal_tick) |