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ad_pnmon: Allow patterns with zero as valid data 

Allow monitoring of non-PN patterns which have zeros in it.
e.g. nible-ramp, full range ramp.

Singular zeros got ignored if not out of sync, while OOS_THRESHOLD
consecutive zeros or non-matching data asserts the out of sync line.
main
Laszlo Nagy 2020-06-23 11:47:28 +01:00 committed by Laszlo Nagy
parent bf06a5c08f
commit 05167e2c2b
1 changed files with 21 additions and 7 deletions
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28
library/common/ad_pnmon.v
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@ -38,7 +38,9 @@
module ad_pnmon #( module ad_pnmon #(
parameter DATA_WIDTH = 16) ( parameter DATA_WIDTH = 16,
parameter OOS_THRESHOLD = 16,
parameter ALLOW_ZERO_MASKING = 0) (
// adc interface // adc interface
@ -47,10 +49,15 @@ module ad_pnmon #(
input [(DATA_WIDTH-1):0] adc_data_in, input [(DATA_WIDTH-1):0] adc_data_in,
input [(DATA_WIDTH-1):0] adc_data_pn, input [(DATA_WIDTH-1):0] adc_data_pn,
input adc_pattern_has_zero,
// pn out of sync and error // pn out of sync and error
output adc_pn_oos, output adc_pn_oos,
output adc_pn_err); output adc_pn_err
);
localparam CNT_W = $clog2(OOS_THRESHOLD);
// internal registers // internal registers
@ -59,7 +66,7 @@ module ad_pnmon #(
reg adc_pn_match_z = 'd0; reg adc_pn_match_z = 'd0;
reg adc_pn_oos_int = 'd0; reg adc_pn_oos_int = 'd0;
reg adc_pn_err_int = 'd0; reg adc_pn_err_int = 'd0;
reg [ 3:0] adc_pn_oos_count = 'd0; reg [CNT_W-1:0] adc_pn_oos_count = 'd0;
// internal signals // internal signals
@ -68,14 +75,21 @@ module ad_pnmon #(
wire adc_pn_match_s; wire adc_pn_match_s;
wire adc_pn_update_s; wire adc_pn_update_s;
wire adc_pn_err_s; wire adc_pn_err_s;
wire adc_valid_zero;
// make sure data is not 0, sequence will fail. // make sure data is not 0, sequence will fail.
assign adc_pn_match_d_s = (adc_data_in == adc_data_pn) ? 1'b1 : 1'b0; assign adc_pn_match_d_s = (adc_data_in == adc_data_pn) ? 1'b1 : 1'b0;
assign adc_pn_match_z_s = (adc_data_in == 'd0) ? 1'b0 : 1'b1; assign adc_pn_match_z_s = (adc_data_in == 'd0) ? 1'b1 : 1'b0;
assign adc_pn_match_s = adc_pn_match_d & adc_pn_match_z; assign adc_pn_match_s = adc_pn_match_d & ~adc_pn_match_z;
assign adc_pn_update_s = ~(adc_pn_oos_int ^ adc_pn_match_s); assign adc_pn_update_s = ~(adc_pn_oos_int ^ adc_pn_match_s);
assign adc_pn_err_s = ~(adc_pn_oos_int | adc_pn_match_s);
// Ignore sporadic zeros in middle of pattern if not out of sync
// but OOS_THRESHOLD consecutive zeros would assert out of sync.
assign adc_valid_zero = ALLOW_ZERO_MASKING & adc_pattern_has_zero &
~adc_pn_oos_int & adc_pn_match_z_s;
assign adc_pn_err_s = ~(adc_pn_oos_int | adc_pn_match_s | adc_valid_zero);
// pn oos and counters (16 to clear and set). // pn oos and counters (16 to clear and set).
@ -88,7 +102,7 @@ module ad_pnmon #(
adc_pn_match_z <= adc_pn_match_z_s; adc_pn_match_z <= adc_pn_match_z_s;
if (adc_valid_d == 1'b1) begin if (adc_valid_d == 1'b1) begin
adc_pn_err_int <= adc_pn_err_s; adc_pn_err_int <= adc_pn_err_s;
if ((adc_pn_update_s == 1'b1) && (adc_pn_oos_count >= 15)) begin if ((adc_pn_update_s == 1'b1) && (adc_pn_oos_count >= OOS_THRESHOLD-1)) begin
adc_pn_oos_int <= ~adc_pn_oos_int; adc_pn_oos_int <= ~adc_pn_oos_int;
end end
if (adc_pn_update_s == 1'b1) begin if (adc_pn_update_s == 1'b1) begin