From 9998df2191f168f21b82f028472fd41955c6443b Mon Sep 17 00:00:00 2001
From: Daniel van der Schuur <schuur@astron.nl>
Date: Wed, 8 Apr 2015 08:48:23 +0000
Subject: [PATCH] -Fixed FIFO readout as it did not work properly with gapped
data.
---
libraries/dsp/correlator/src/vhdl/corr_accumulator.vhd | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libraries/dsp/correlator/src/vhdl/corr_accumulator.vhd b/libraries/dsp/correlator/src/vhdl/corr_accumulator.vhd
index 96fa226426..4b8bbe55d4 100644
--- a/libraries/dsp/correlator/src/vhdl/corr_accumulator.vhd
+++ b/libraries/dsp/correlator/src/vhdl/corr_accumulator.vhd
@@ -53,7 +53,7 @@ ARCHITECTURE str OF corr_accumulator IS
-- Complex accumulator data width: wide enough to support g_integration_period accumulations
CONSTANT c_acc_data_w : NATURAL := g_data_w + ceil_log2(g_integration_period);
- CONSTANT c_adder_latency : NATURAL := 3;
+ CONSTANT c_adder_latency : NATURAL := 2;
CONSTANT c_fifo_latency : NATURAL := 1;
SIGNAL reg_snk_in_arr :t_dp_sosi_arr(g_nof_inputs-1 DOWNTO 0);
@@ -148,7 +148,7 @@ BEGIN
-- Shift out the first accumulated value when it aligns with the corresponding current value at the adder input
-- . this produces the dp_fifo_sc_src_out_arr data in sync with reg_snk_in_arr data
- dp_fifo_sc_src_in_arr(i).ready <= snk_in_arr(i).valid WHEN TO_UINT(dp_fifo_sc_usedw_arr(i))=g_nof_accumulators-c_adder_latency-c_fifo_latency ELSE '0';
+ dp_fifo_sc_src_in_arr(i).ready <= snk_in_arr(i).valid WHEN TO_UINT(dp_fifo_sc_usedw_arr(i))>=g_nof_accumulators-1-c_adder_latency-c_fifo_latency-1 ELSE '0';
END GENERATE;
--
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