Transcript 1_Francois_Kapp

All things DBE…
Francois Kapp
Sub-system Manager: DBE
[email protected]
On behalf of the DBE team present and past...
S Rajan, E Bauermeister, A Rust, L Sofeya, P Gibbs, S Malan, W New, R van Rooyen, A Barta, A Martens, J
Manley, P Prozesky, V Moss, D George
What we do…
Outline
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Context
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CASPER
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HW Tools
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SW Tools
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Community
KAT-7
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KAT-7 DBE
MeerKAT
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MeerKAT Requirements
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MeerKAT System Architecture Aspects
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MeerKAT Cost
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MeerKAT Schedule
Context
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We are engineers…
Context
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We use acronyms like:
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PCB, FPGA, ROACH, MSSGE, PFB, ADC, DBE…
Context
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We typically add them together…
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+
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Context
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and we keep doing this…
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Context
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And sometimes we use multiplication…
16 x
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CASPER
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CASPER – Collaboration for Astronomy Signal
Processing and Electronics Research
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Started at U.C. Berkeley
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Trying to create the “PC” of RA
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Re-configurable computing
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Use low cost commodity hardware (common to
many observatories)
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Develop few platforms quickly
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Upgrade often
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Accelerate the application development
CASPER Generic Architecture
ROACH
CASPER and ROACH
CASPER, ROACH and MIC?
ROACH in the future
CASPER SW/FW/GW Tools ..1
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MSSGE Toolflow
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Matlab/Simulink/System Generator/Embedded Development Kit
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But…
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Current Matlab/Simulink tool-flow is becoming unstable and is not scaling
well with FPGA size -> we need a new solution
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MyHDL: Python based tool to simulate python code and convert it to Verilog
or VHDL
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Designing a set of DSP libraries using combination of Verilog and MyHDL
(Python)
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Implementing a Python framework to manage design simulation and
synthesis of Radio Astronomy Instruments on FPGA hardware
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Wesley New - poster
CASPER SW/FW/GW Tools ..2
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SPEAD
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Streaming Protocol for Exchange of Astronomical Data
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High “speed” data protocol
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https://casper.berkeley.edu/wiki/SPEAD
KATCP
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A text based language for devices on the KAT network
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Now: ?request, !reply, #inform
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Future: would like to describe complex tasks in KATCP fashion
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Need:
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A way to describe tasks (statemachines)
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An Interpreter
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Sets of modules containing operations and conditions
Meet ?sm – Adam Barta to handle a proper introduction – poster
CASPER SW/FW/GW Tools ..3
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BORPH
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Berkeley Operating system for ReProgrammable Hardware
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http://www.eee.hku.hk/~hso/borph.html
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Corr – Python library for CASPER packetised Correlators
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Linux Driver work
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Automated Gateware Discovery Using Open Firmware
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Research framework to describe FPGA designs, facilitate detection by
OS, interaction using conventional device drivers.
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Specific to KAT digital backends
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Provides an alternative approach to reduce time and effort spent on
writing software for each piece of gateware generated
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Shanly Rajan – talk
CASPER Community
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https://casper.berkeley.edu/
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Workshops, mini workshops, mailing lists and friendly ghosts
KAT-7 ASC
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Inside KAT-7 ASC
GPS Rubidium Clock
Network Switch
RFE Stage 7
DBE ROACH Board
Fibre Patch Panels
CSS Sun Servers
KAT-7 DBE
MeerKAT
MeerKAT – Phases
Phase 1
(current planning)
Phase 2
Estimated completion date
2016
2018
Frequency bands (GHz)
1-1.75
0.58 – 1.015
8-14.5
RF bandwidth (MHz)
850
6500
Sampling frequency (GSPS)
~2
~15?
Processed bandwidth (MHz)
850
6500?
8
50?
Max baseline (km)
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All current planning for phase1 – funded, well defined
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Subsequent phases not finalized, but considered in design
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Phase 2
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Added Receivers (frequency upgrade)
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Added antennae (baseline upgrade)
MeerKAT Subsystems on antenna
Antenna structures
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Move the Digitisation up the signal chain
and onto the Antenna (close to the feed)
Receivers
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Feed selector
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Sub-arrays mean that different feeds can
be selected on different antennae
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Signals transported to the KAPB digitally
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Time and Frequency References to be
distributed
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Digitiser
MeerKAT DBE
MeerKAT Digitiser
MeerKAT TFR
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Time and Frequency Reference Sub-system
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Distributes a Reference Clock and Synchronisation Pulse
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For phase 2:
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Must compensate for thermal and mechanical effects in fibre
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Buried 1m deep, but exposed at antenna
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Cable wrap effects
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Measure round-trip phase
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Compensate by controlling clock phase or in correlator
MeerKAT DBE Cost
MeerKAT DBE Cost ..2
MeerKAT Schedule
MeerKAT Schedule
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2013 – Dish 1
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Start with ROACH2 based test system, prototype Digitiser
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Build up to:
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5 (end 2014, ROACH2)
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20 (end 2015, ROACH2)
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Full 64 (2016, ROACH3)
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ROACH3 into production – 2013
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Final Digitiser Qualification 2013
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System acceptance end 2016
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And then there’s phase 2...
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And SKA?