ata_snap

This repository contains SNAP firmware and associated control software originally designed for use at the Allen Telescope Array.

The current firmware model is snap_adc5g_feng[_rpi].slx.

It has the following features:

• Dual-polarization input
• Up to 2500 MSamples/s 8-bit sampling using CASPER's adc5g ADC card
• 4096 Frequency Channels (8-tap FIR + FFT architecture)

Spectrometer output mode

• XX, YY, XY output products
• Slow-speed polled output @ ~1 second time resolution
• 10 Gb Ethernet output @ ~100 microsecond time resolution

Voltage "F-Engine" mode

• 4+4 bit complex channelized voltages (4096 channels over the Nyquist band)
• 10 Gb Ethernet output (only available when not using the spectrometer 10 GbE output)
• Output up to 2048 of 4096 channels
• 8192 Byte (+ 64 byte header) UDP jumbo packets
• Spread 2048 channels over up to 8 different destination IP addresses

Compiling the firmware

Software versions

• Ubuntu 18.04
• MATLAB/Simulink 2019a
• Xilinx Vivado System Edition 2019.1.3

To open/modify/compile:

1. Clone this repository
2. Clone submodules:

   git submodule init
   git submodule update

3. Create a local environment specification file startsg.local.
4. From the top level of this repository, run startsg (if your environment file is called startsg.local) or startsg <my_local_environment_file.local>.

Source Files

• snap_adc5g_feng.slx -- Simulink firmware model supporting Microblaze 10GbE control interface
• snap_adc5g_feng_rpi.slx -- Simulink firmware model supporting a Raspberry Pi (katcp / 1GbE) interface
• sw/ata_snap -- Python control software & supporting libraries