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Match integrator width to period register width in PTP CDC module

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
This commit is contained in:
Alex Forencich 2023-09-22 01:07:43 -07:00
parent cf441f004d
commit 4a32c86f07
1 changed files with 5 additions and 5 deletions
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10
rtl/ptp_clock_cdc.v
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@ -90,7 +90,7 @@ localparam SAMPLE_ACC_WIDTH = LOG_SAMPLE_SYNC_RATE+2;
localparam DEST_SYNC_LOCK_WIDTH = 7;
localparam PTP_LOCK_WIDTH = 8;
localparam TIME_ERR_INT_WIDTH = NS_WIDTH+FNS_WIDTH+16;
localparam TIME_ERR_INT_WIDTH = NS_WIDTH+FNS_WIDTH;
localparam [30:0] NS_PER_S = 31'd1_000_000_000;
@ -639,9 +639,9 @@ always @* begin
// time integral of error
if (ptp_locked_reg) begin
{ptp_ovf, time_err_int_next} = $signed({1'b0, time_err_int_reg}) + $signed({ts_ns_diff_corr_reg, ts_fns_diff_corr_reg});
{ptp_ovf, time_err_int_next} = $signed({1'b0, time_err_int_reg}) + ($signed({ts_ns_diff_corr_reg, ts_fns_diff_corr_reg}) / 2**16);
end else begin
{ptp_ovf, time_err_int_next} = $signed({1'b0, time_err_int_reg}) + ($signed({ts_ns_diff_corr_reg, ts_fns_diff_corr_reg}) * 2**3);
{ptp_ovf, time_err_int_next} = $signed({1'b0, time_err_int_reg}) + ($signed({ts_ns_diff_corr_reg, ts_fns_diff_corr_reg}) / 2**13);
end
// saturate
@ -655,9 +655,9 @@ always @* begin
// compute output
if (ptp_locked_reg) begin
{ptp_ovf, period_ns_next, period_fns_next} = ($signed({1'b0, time_err_int_reg}) / 2**16) + ($signed({ts_ns_diff_corr_reg, ts_fns_diff_corr_reg}) / 2**10);
{ptp_ovf, period_ns_next, period_fns_next} = $signed({1'b0, time_err_int_reg}) + ($signed({ts_ns_diff_corr_reg, ts_fns_diff_corr_reg}) / 2**10);
end else begin
{ptp_ovf, period_ns_next, period_fns_next} = ($signed({1'b0, time_err_int_reg}) / 2**16) + ($signed({ts_ns_diff_corr_reg, ts_fns_diff_corr_reg}) / 2**7);
{ptp_ovf, period_ns_next, period_fns_next} = $signed({1'b0, time_err_int_reg}) + ($signed({ts_ns_diff_corr_reg, ts_fns_diff_corr_reg}) / 2**7);
end
// saturate