From 1546d431054830ce5127ac309507b6661b5bc45e Mon Sep 17 00:00:00 2001
From: Eric Kooistra <kooistra@astron.nl>
Date: Mon, 10 May 2021 17:10:34 +0200
Subject: [PATCH] Added note on circular buffer for bsn aligner v2.
---
.../doc/prestudy/station2_sdp_hdl_components.txt | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/applications/lofar2/doc/prestudy/station2_sdp_hdl_components.txt b/applications/lofar2/doc/prestudy/station2_sdp_hdl_components.txt
index 6dc4dd5999..86d425c609 100755
--- a/applications/lofar2/doc/prestudy/station2_sdp_hdl_components.txt
+++ b/applications/lofar2/doc/prestudy/station2_sdp_hdl_components.txt
@@ -329,7 +329,16 @@ Design options:
==> Design decision:
Do not make or use a dp_sync_aligner, because loosing an entire sync interval is not acceptable.
-
+. Assume circular buffer:
+ - advantage:
+ . direct access to each word in block
+ . no need to flush blocks, status bit per block tells whether it is filled
+ - buffer is filled and read after certain latency, because then all remote packets should have arrived
+ . provide CP for active input streams, is this needed ?
+ - use MM interface to read from head column (with block for all parallel streams)
+ - provide mm to dp component with bsn aligner (= dp_block_from_mm ?)
+ - provide MP for nof lost = nof filler blocks / stream ?
+ . err at eop indicates lost = filler data, sosi_info could have eop at sop like with crosslets_info
. Initial alignment:
- Assume the received packets on the inputs contain one block per packet.
--
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