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RTSD
HDL
Commits
add9bbc9
Commit
add9bbc9
authored
2 years ago
by
Eric Kooistra
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Add notes from meeting.
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applications/lofar2/doc/prestudy/station2_sdp_transient_buffer.txt
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add9bbc9
Detailed design: Transient Buffer function (LIFT)
References:
[1] https://plm.astron.nl/polarion/#/project/LOFAR2System/workitem?id=LOFAR2-12060 Transient buffer data
[1] LIFT requirements: https://plm.astron.nl/polarion/#/project/LOFAR2System/wiki/Overview%20pages/LIFT%20Reference
[2] https://support.astron.nl/confluence/display/L2M/2022-10-24+LIFT+meeting+notes
[3] L1 LOFAR2 Decision: Transport of buffer data from Station to CEP, https://support.astron.nl/confluence/pages/viewpage.action?pageId=94766339
[4] LOFAR1 TBB: https://support.astron.nl/confluence/display/L2M/Temporary+storage+of+documents+and+papers
1) DDR4 memory per receiver input
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@@ -17,7 +20,12 @@ Assume 4 % storage overhead for packet header information
==> Per recveiver input T_tbuf = 1.33 GByte = 10.6 Gbit, so at full 10GbE rate it takes about 1 s to read all samples from 1 receiver input
==> 192 * 1.33 = 256 GByte / LB for T_tbuf = 3.2 s
In [1] time series data en pulse data, wat is pulse data ?
In LOFAR12060 [1] time series data en pulse data, wat is pulse data :
De Transient Buffer Time-Series Data Product zijn de ruwe samples, zoals we daar net ook over spraken
De Transient Buffer Pulse Data Product is dat wat er uit de Transient Detect moet komen
Voor beide geldt dan natuurlijk dat CEP er een data product van moet maken
Hoe streng is de 3.33 s, mag 3.2 s ook ?
Gebruik een 16 GByte module per FPGA, zodat uitbreiding naar 6.66 s mopgelijkl is door beide slots the gebruiken
Uitlezen per receiver input, zodat uitlezen van een deel vd receiver inputs mogelijk is (bijv 12 vd 192 in [1])
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@@ -25,3 +33,24 @@ Defineer TB functie per receiver input:
. zodat de TB functie makkelijk uitbreidbaar is naar meer inputs en naar meer DDR4 modules.
. data capture en uitlezen van een receiver input onafhankelijk kan van de andere receiver inputs
2) Meeting EK-BH 24 okt 2022 [2]
Design decision 16GByte DDR4 na L2SDP-854, 850
. uitbreidbaar door andere slot ook te vullen
. 1 slot met 16GB kost minder FPGA resources dan 2 slots met 8GB
- Uitgaan van 14 bit ingepakt
- < 14 bit --> select reg voor welke 8 bit als veld in header
- ICD SC-SDP CP, MP
. unfreeze, freeze, read out range from buffer
- ICD SDP-CEP
. packet header and payload data format 3.1.2 in TBB1 doc
. applied coarse delay (compenseert voor cable delay)
. receiver configuration (LB, HB, frequency band, attenuation)
. read out flow control
- One dual polarion
- Ring
- Buffer lengte versus nof antennes
- Self trigger
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