ASIX SIGMA / SIGMA2
The ASIX SIGMA is a 16 channel logic analyzer with sample rate support up to 200 MHz and with 256 Mbit on-board memory.
It is supported by sigrok, and the necessary firmware files are generously provided by the vendor for distribution. As a result, the SIGMA works out of the box with sigrok. Trigger support has been implemented in 100 MHz and 200 MHz modes for rising/falling edges. In other modes, users can specify additional trigger values, listed in the table below.
| Samplerate | Number of probes | Trigger support |
|---|---|---|
| 200 kHz | 16 | Edge of two probes, state, boolean expression1 |
| 250 kHz | 16 | Edge of two probes, state, boolean expression1 |
| 500 kHz | 16 | Edge of two probes, state, boolean expression1 |
| 1 MHz | 16 | Edge of two probes, state, boolean expression1 |
| 5 MHz | 16 | Edge of two probes, state, boolean expression1 |
| 10 MHz | 16 | Edge of two probes, state, boolean expression1 |
| 25 MHz | 16 | Edge of two probes, state, boolean expression1 |
| 50 MHz | 16 | Edge of two probes, state, boolean expression1 |
| 100 MHz | 8 | Edge of one probe |
| 200 MHz | 4 | Edge of one probe |
1 Boolean expression feature not implemented in sigrok yet.
See ASIX SIGMA/Info for more detailed information on the device.
Example usage
An example that captures from 4 probes, for 100ms at 10 MHz, with trigger condition 1:high, 2:rising, 3:low, 4:high.
$ sigrok-cli --wait-trigger --triggers 1=1,2=r,3=0,4=1 --samples 5000000 --time 100 -o samplerate=10m -f bits -p 1-4
Firmware
The firmware files (FPGA bitstreams) for the ASIX SIGMA have been provided by the vendor under a license which allows redistribution, and are available from the sigrok-firmwares repository:
$ git clone git://sigrok.git.sourceforge.net/gitroot/sigrok/sigrok-firmwares
In order to use the ASIX SIGMA in sigrok, you need to copy the firmware files to the correct sigrok directory, /usr/local/share/sigrok/firmware per default:
$ cp sigrok-firmwares/asix-sigma/*.fw /usr/local/share/sigrok/firmware
Resources
- Initial support for Asix Sigma in Sigrok
- PING Labs: Sampi – A Logic Analyzer
- flickr: ASIX SIGMA in chlunde's photostream (photos and more information about the device)