From ecdf010628fd428bc09e74b4ea0710ed5cdfb153 Mon Sep 17 00:00:00 2001
From: Erik Kooistra <kooistra@astron.nl>
Date: Thu, 19 Jul 2018 13:30:29 +0000
Subject: [PATCH] #1860 : use beamlet output clipping instead of wrapping.
---
.../src/vhdl/node_apertif_unb1_fn_beamformer.vhd | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/applications/apertif/designs/apertif_unb1_fn_beamformer/src/vhdl/node_apertif_unb1_fn_beamformer.vhd b/applications/apertif/designs/apertif_unb1_fn_beamformer/src/vhdl/node_apertif_unb1_fn_beamformer.vhd
index 8ac8d31ade..9f43254865 100644
--- a/applications/apertif/designs/apertif_unb1_fn_beamformer/src/vhdl/node_apertif_unb1_fn_beamformer.vhd
+++ b/applications/apertif/designs/apertif_unb1_fn_beamformer/src/vhdl/node_apertif_unb1_fn_beamformer.vhd
@@ -129,6 +129,7 @@ ARCHITECTURE str OF node_apertif_unb1_fn_beamformer IS
CONSTANT c_nof_clk_per_sync : NATURAL := c_nof_blocks_per_sync * c_block_period; -- = 800000 * 256
CONSTANT c_bsn_sync_timeout : NATURAL := (c_nof_clk_per_sync * 10)/8; -- *10/8 as margin
+ CONSTANT c_use_output_clipping : BOOLEAN := TRUE; -- TRUE = beamlet clipping, FALSE = beamlet wrap (see #1860)
CONSTANT c_use_force : BOOLEAN := TRUE; -- TRUE to instantiate dp_force module
CONSTANT c_ram_fringe_stop_addr_w : POSITIVE := ceil_log2(g_bf.nof_weights);
CONSTANT c_fs_offset_w : POSITIVE := 10;
@@ -286,8 +287,8 @@ BEGIN
g_lsb_w => c_fs_quant_lsb_w,
g_lsb_round => TRUE,
g_lsb_round_clip => FALSE,
- g_msb_clip => FALSE, -- default BF should not clip
- g_msb_clip_symmetric => FALSE,
+ g_msb_clip => c_use_output_clipping,
+ g_msb_clip_symmetric => c_use_output_clipping,
g_gain_w => 0,
g_pipeline_remove_lsb => 1,
g_pipeline_remove_msb => 0,
--
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