Difference between revisions of "Saleae Logic16"

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(Some notes on the firmware)
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File:Saleae Logic16 PCB bottom.jpg|<small>PCB, bottom</small>
File:Saleae Logic16 PCB bottom.jpg|<small>PCB, bottom</small>
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== Firmware ==
The firmware for the FX2LP is embedded in the vendor application as a set of Intel HEX lines.  Each line is uploaded individually with a separate control transfer.  The firmware currently occupies the address range [0x0000-0x145d], but is uploaded out of order.  <span style="color: red">TODO</span>: Make a tool to extract the firmware from the application binary.


== Protocol ==
== Protocol ==

Revision as of 11:51, 21 July 2013

Saleae Logic16, front

The Saleae Logic16 is a USB-based, 16-channel logic analyzer with 100/50/25/12.5MHz sampling rate (at 2/4/8/16 enabled channels).

The case requires a Torx T5 screwdriver to open.

See Saleae Logic16/Info for more details (such as lsusb -vvv output) about the device.

See Saleae Logic for the predecessor product of the Saleae Logic16.

Hardware

  • Xilinx XC3S200A 200K gate FPGA
  • Cypress CY7C68013A-56PVXC (FX2LP) USB interface chip

Photos

Firmware

The firmware for the FX2LP is embedded in the vendor application as a set of Intel HEX lines. Each line is uploaded individually with a separate control transfer. The firmware currently occupies the address range [0x0000-0x145d], but is uploaded out of order. TODO: Make a tool to extract the firmware from the application binary.

Protocol

Sample format:

The samples (as received via USB) for the enabled probes (3, 6, 9, or 16) are organized as follows:

0xLL 0xLL  0xMM 0xMM  0xNN 0xNN   0xPP 0xPP  0xQQ 0xQQ  0xRR 0xRR ...

In the above example, 3 probes are enabled. For each probe there are 2 bytes / 16 bits (e.g. 0xLL 0xLL for probe 0), then the next probe's data is received (0xMM 0xMM for probe 1), then 0xNN 0xNN for probe 2. When 2 bytes have been received for all enabled probes, the process restarts with probe 0 again.

The 16 bits of data per probe seem to contain the pin state of the respective probe (1: high, 0: low) at 16 different sampling points/times (which ones depends on the samplerate).

Resources