Saleae Logic16

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

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  Device, front

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  Device, bottom

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  PCB, top

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  PCB, bottom

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.

See Saleae Logic16/Firmware for more details on the vendor firmware.

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).

Configuration:

Endpoint 1 is used for configuration of the analyzer. Two kinds of transfers are used; a 3 byte out transfer starting with 0x55 followed by a 1 byte in transfer, and a 4 byte out transfer starting with 0x5a. It's quite plausible that these provide raw read/write access to memory locations.

Channel number configuration
3 channels	0x5a 0x32 0xf4 0x38 0x5a 0x32 0xef 0x1b
6 channels	0x5a 0x32 0xf4 0xc0 0x5a 0x32 0xef 0x1b
9 channels	0x5a 0x32 0xf4 0x80 0x5a 0x32 0xef 0xc8

Sampling frequency
500 kHz	0x5a 0x32 0x4c 0x61 0x5a 0x32 0x82 0xb0
8 MHz	0x5a 0x32 0x4c 0x5e 0x5a 0x32 0x82 0x0c

Resources

• Manual
• Vendor software
• SDKs