X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/67ac4bf75c6953cae546159acd3e887d757bd0c3..5b95953d4227d9af4b5a5f20156b668bba55aac8:/fpga/hi_read_rx_xcorr.v

diff --git a/fpga/hi_read_rx_xcorr.v b/fpga/hi_read_rx_xcorr.v
index dece2db3..ec6583b2 100644
--- a/fpga/hi_read_rx_xcorr.v
+++ b/fpga/hi_read_rx_xcorr.v
@@ -99,8 +99,10 @@ end
 reg [5:0] corr_i_cnt;
 reg [5:0] corr_q_cnt;
 // And a couple of registers in which to accumulate the correlations.
-reg signed [15:0] corr_i_accum;
-reg signed [15:0] corr_q_accum;
+// we would add at most 32 times adc_d, the result can be held in 13 bits. 
+// Need one additional bit because it can be negative as well
+reg signed [13:0] corr_i_accum;
+reg signed [13:0] corr_q_accum;
 reg signed [7:0] corr_i_out;
 reg signed [7:0] corr_q_out;
 
@@ -114,12 +116,13 @@ begin
     begin
         if(snoop)
         begin
-            corr_i_out <= {corr_i_accum[12:6], after_hysteresis_prev};
-            corr_q_out <= {corr_q_accum[12:6], after_hysteresis};
+			// highest 7 significant bits of tag signal (signed), 1 bit reader signal:
+            corr_i_out <= {corr_i_accum[13:7], after_hysteresis_prev};
+            corr_q_out <= {corr_q_accum[13:7], after_hysteresis};
         end
         else
         begin
-            // Only correlations need to be delivered.
+            // highest 8 significant bits of tag signal
             corr_i_out <= corr_i_accum[13:6];
             corr_q_out <= corr_q_accum[13:6];
         end