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Split out and pipeline relative timestamp LSB increment in PTP TD leaf clock

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
This commit is contained in:
Alex Forencich 2024-02-05 16:22:02 -08:00
parent eb0f01f276
commit 0ac15c6872
1 changed files with 20 additions and 7 deletions
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27
rtl/ptp_td_leaf.v
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@ -284,15 +284,17 @@ reg [PERIOD_NS_W+FNS_W-1:0] period_ns_reg = 0, period_ns_next = 0;
reg [9+CMP_FNS_W-1:0] dst_ns_capt_reg = 0;
reg [9+CMP_FNS_W-1:0] src_ns_sync_reg = 0;
reg [FNS_W-1:0] ts_fns_lsb_reg = 0, ts_fns_lsb_next = 0;
reg [FNS_W-1:0] ts_fns_reg = 0, ts_fns_next = 0;
reg [8:0] ts_rel_ns_lsb_reg = 0, ts_rel_ns_lsb_next = 0;
reg [TS_NS_W-1:0] ts_rel_ns_reg = 0, ts_rel_ns_next = 0;
reg ts_tod_step_reg = 1'b0, ts_tod_step_next;
reg ts_rel_step_reg = 1'b0, ts_rel_step_next;
reg [TS_TOD_S_W-1:0] ts_tod_s_reg = 0, ts_tod_s_next = 0;
reg [TS_TOD_NS_W-1:0] ts_tod_ns_reg = 0, ts_tod_ns_next = 0;
reg [8:0] ts_tod_offset_ns_reg = 0, ts_tod_offset_ns_next = 0;
reg ts_rel_step_reg = 1'b0, ts_rel_step_next;
reg ts_tod_step_reg = 1'b0, ts_tod_step_next;
reg pps_reg = 1'b0, pps_next;
reg pps_str_reg = 1'b0, pps_str_next;
@ -641,8 +643,10 @@ assign locked = ptp_locked_reg && freq_locked_reg && dst_sync_locked_reg;
always @* begin
period_ns_next = period_ns_reg;
ts_fns_lsb_next = ts_fns_lsb_reg;
ts_fns_next = ts_fns_reg;
ts_rel_ns_lsb_next = ts_rel_ns_lsb_reg;
ts_rel_ns_next = ts_rel_ns_reg;
ts_rel_step_next = 1'b0;
@ -738,13 +742,18 @@ always @* begin
// PTP clock
// shared fractional ns
ts_fns_next = ts_fns_reg + period_ns_reg;
// shared fractional ns and relative timestamp least significant bits
{ts_rel_ns_lsb_next, ts_fns_lsb_next} = ({ts_rel_ns_lsb_reg, ts_fns_lsb_reg} + period_ns_reg);
ts_fns_next = ts_fns_lsb_reg;
// relative timestamp
ts_rel_ns_next = ({ts_rel_ns_reg, ts_fns_reg} + period_ns_reg) >> FNS_W;
ts_rel_ns_next[8:0] = ts_rel_ns_lsb_reg;
if (TS_REL_EN) begin
if (!ts_rel_ns_next[8] && ts_rel_ns_reg[8]) begin
ts_rel_ns_next[TS_REL_NS_W-1:9] = ts_rel_ns_reg[TS_REL_NS_W-1:9] + 1;
end
if (dst_update_reg && !dst_sync_reg && dst_rel_shadow_valid_reg && (dst_load_cnt_reg == 0)) begin
// check timestamp MSBs
if (dst_rel_step_shadow_reg || ts_rel_load_ts_reg) begin
@ -774,9 +783,9 @@ always @* begin
end
end
// absolute time-of-day timestamp
if (TS_TOD_EN) begin
// absolute time-of-day timestamp
ts_tod_ns_next[8:0] = ts_rel_ns_next[8:0] + ts_tod_offset_ns_reg;
ts_tod_ns_next[8:0] = ts_rel_ns_lsb_reg + ts_tod_offset_ns_reg;
if (ts_tod_ns_reg[TS_TOD_NS_W-1]) begin
pps_str_next = 1'b0;
@ -929,8 +938,10 @@ end
always @(posedge clk) begin
period_ns_reg <= period_ns_next;
ts_fns_lsb_reg <= ts_fns_lsb_next;
ts_fns_reg <= ts_fns_next;
ts_rel_ns_lsb_reg <= ts_rel_ns_lsb_next;
ts_rel_ns_reg <= ts_rel_ns_next;
ts_rel_step_reg <= ts_rel_step_next;
@ -975,7 +986,9 @@ always @(posedge clk) begin
if (rst) begin
period_ns_reg <= 0;
ts_fns_lsb_reg <= 0;
ts_fns_reg <= 0;
ts_rel_ns_lsb_reg <= 0;
ts_rel_ns_reg <= 0;
ts_rel_step_reg <= 1'b0;
ts_tod_s_reg <= 0;