From 37e0981eac7440c640a16a38daf550f74f1948f8 Mon Sep 17 00:00:00 2001
From: Eric Kooistra <kooistra@astron.nl>
Date: Wed, 6 Mar 2024 07:21:40 +0100
Subject: [PATCH] Make code for v.rd_blk_pointer more clear.
---
libraries/base/dp/src/vhdl/dp_bsn_align_v2.vhd | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/libraries/base/dp/src/vhdl/dp_bsn_align_v2.vhd b/libraries/base/dp/src/vhdl/dp_bsn_align_v2.vhd
index 9042f050f7..eae4c4d60f 100644
--- a/libraries/base/dp/src/vhdl/dp_bsn_align_v2.vhd
+++ b/libraries/base/dp/src/vhdl/dp_bsn_align_v2.vhd
@@ -275,12 +275,16 @@ begin
v.bsn_arr(v.wr_blk_pointer) := w.ref_sosi.bsn(g_bsn_w - 1 downto 0);
-- . update read block pointer at g_bsn_latency_max blocks behind the
- -- reference write pointer, dependent on the node_index. For
- -- g_bsn_latency_max = 1 the node_index = 0 fixed. For
- -- g_bsn_latency_max > 1, node_index is the first BSN aligner in a
- -- chain. Each subsequent node in the chain then has to account for
- -- g_bsn_latency_max additional block latency.
- v.rd_blk_pointer := v.wr_blk_pointer - g_bsn_latency_max * (1 + node_index);
+ -- reference write pointer, dependent on the node_index:
+ -- - for g_nof_aligners_max = 1 the node_index = 0 fixed
+ -- - for g_nof_aligners_max > 1, node_index is the first BSN aligner in
+ -- a chain. Each subsequent node in the chain then has to account
+ -- for g_bsn_latency_max additional block latency.
+ if g_nof_aligners_max = 1 then
+ v.rd_blk_pointer := v.wr_blk_pointer - g_bsn_latency_max;
+ else
+ v.rd_blk_pointer := v.wr_blk_pointer - g_bsn_latency_max * (1 + node_index);
+ end if;
if v.rd_blk_pointer < 0 then
v.rd_blk_pointer := v.rd_blk_pointer + c_buffer_nof_blocks;
end if;
--
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