Saleae Logic16

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Saleae Logic16
Saleae Logic16 bottom.png
Status supported
Source code saleae-logic16
Channels 3/6/9/16
Samplerate 100/50/32/16MHz
Samplerate (state)
Triggers none (SW-only)
Min/max voltage -0.9V — 6V
Threshold voltage configurable:
for 1.8V to 3.6V systems: VIH=1.4V, VIL=0.7V
for 5V systems: VIH=3.6V, VIL=1.4V
Memory none
Compression yes

The Saleae Logic16 is a USB-based, 16-channel logic analyzer with 100/50/32/16MHz sampling rate (at 3/6/9/16 enabled channels).

The case requires a Torx T5 screwdriver to open.

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

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


Pinouts and connections:

JTAG header (FPGA):

The J3 pin header is a JTAG connector wired to the FPGA. The pins are (from left to right, the right-most pin, pin number 1, is square):

5 4 3 2 1


T1 T2 T3
1.2V 3.3V GND (FX2)

Cypress FX2:

(FPGA 15, IO_L05P_3) PD5 1-   O -56 PD4 (FPGA 12, IO_L04P_3)
(FPGA 13, IO_L04N_3) PD6 2- -55 PD3 (FPGA 44, IO_L09N_2)
(FPGA 10, IO_L03N_3) PD7 3- -54 PD2 (FPGA 5, IO_L02P_3)
GND 4- -53 PD1 (FPGA 4, IO_L01N_3)
(FPGA 90, IO_0) CLKOUT 5- -52 PD0 (FPGA 6, IO_L02N_3)
VCC 6- -51 *WAKEUP (3.3V)
GND 7- -50 VCC
(FPGA 3, IO_L01P_3) RDY0/*SLRD 8- -49 RESET# (3.3V via D2 (diode?))
(FPGA 16, IO_L05N_3) RDY1/*SLWR 9- -48 GND
AVCC 10- -47 PA7 (FPGA 9, IO_L03P_3)
(24MHz crystal) XTALOUT 11- -46 PA6 (FPGA 30, IO_L04P_2)
(24MHz crystal) XTALIN 12- -45 PA5 (FPGA 85, IO_L03P_0)
AGND 13- -44 PA4 (FPGA 98, IO_L06P_0)
AVCC 14- -43 PA3 (FPGA 51, MISO)
(USB D+) DPLUS 15- -42 PA2 (FPGA 53, CCLK)
(USB D-) DMINUS 16- -41 PA1 (FPGA 48, INIT_B)
AGND 17- -40 PA0 (FPGA 54, DONE)
VCC 18- -39 VCC
GND 19- -38 CTL2 (FPGA 100, PROG_B)
(FPGA 84, IO_L02N_0) *IFCLK 20- -37 CTL1 (FPGA 97, IP_0)
RESERVED 21- -36 CTL0 (FPGA 94, IO_L05N_0)
VCC 24- -33 GND
(FPGA 40, IO_L08P_2) PB0 25- -32 PB7 (FPGA 93, IO_L05P_0)
(FPGA 78, IO_L01N_0) PB1 26- -31 PB6 (FPGA 37, IO_L07N_2)
(FPGA 77, IO_L01P_0) PB2 27- -30 PB5 (FPGA 41, IO_L08N_2)
(FPGA 49, IO_L10N_2) PB3 28- -29 PB4 (FPGA 46, MOSI)

Other FPGA connections:

28 CH0 52 CH8
29 CH1 56 CH9
32 CH2 57 CH10
33 CH3 60 CH11
34 CH4 61 CH12
36 CH5 62 CH13
43 CH6 64 CH14
50 CH7 65 CH15
73 LED (active low)



Firmware and FPGA bitstream usage

To use the Saleae Logic16 (or its clones) with sigrok, you must first use a Python script to extract the FX2 firmware and the FPGA bitstreams from version 1.2.10 of Saleae's Logic software.

First download the Saleae vendor software. This version has been tested to work, but more recent versions are not supported currently (see bug #989). Old Saleae vendor software versions can be downloaded from (32-bit vs 64-bit download doesn't matter; both produce the same output.)

Then extract the Logic Linux binary from the zip file and use the sigrok-fwextract-saleae-logic16 tool to extract the files from it. On Windows, this Python script can be run from python.exe. On Linux, it can be executed directly:

$ sigrok-fwextract-saleae-logic16 Logic
saved 5214 bytes to saleae-logic16-fx2.fw
saved 149516 bytes to saleae-logic16-fpga-18.bitstream
saved 149516 bytes to saleae-logic16-fpga-33.bitstream

Copy these files to the directory where your libsigrok installation expects them and they will be found and used automatically by the libsigrok saleae-logic16 driver.

On Linux, this is usually /usr/local/share/sigrok-firmware or /usr/share/sigrok-firmware. The latter is correct on Ubuntu (and where files are created by the unrelated sigrok-firmware-fx2lafw package).

On Windows, they should be placed in C:\Program Files\sigrok\PulseView\share\sigrok-firmware\.

On macOS, they should be placed in /[…]/

Technical firmware details

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.

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


In Windows, the USB driver must also be installed using Zadig, similar to other devices, or you will get sr: saleae-logic16: Failed to init device.


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).


Endpoint 1 is used for configuration of the analyzer. The transfers are "encrypted" using a simple series of additions and XORs. Two kinds of transfers are used; a 3 byte out transfer starting with 0x81 followed by a 1 byte in transfer, and a 4 byte out transfer starting with 0x80. It's quite plausible that these provide raw read/write access to memory locations.

Channel number configuration
3 channels 0x80 0x01 0x02 0x07 0x80 0x01 0x03 0x00
6 channels 0x80 0x01 0x02 0x3f 0x80 0x01 0x03 0x00
9 channels 0x80 0x01 0x02 0xff 0x80 0x01 0x03 0x01
16 channels 0x80 0x01 0x02 0xff 0x80 0x01 0x03 0xff
Sampling frequency
500kHz 0x80 0x01 0x0a 0x00 0x80 0x01 0x04 0xc7
1MHz 0x80 0x01 0x0a 0x00 0x80 0x01 0x04 0x63
2MHz 0x80 0x01 0x0a 0x00 0x80 0x01 0x04 0x31
4MHz 0x80 0x01 0x0a 0x00 0x80 0x01 0x04 0x18
5MHz 0x80 0x01 0x0a 0x00 0x80 0x01 0x04 0x13
8MHz 0x80 0x01 0x0a 0x01 0x80 0x01 0x04 0x13
10MHz 0x80 0x01 0x0a 0x00 0x80 0x01 0x04 0x09
12.5MHz 0x80 0x01 0x0a 0x00 0x80 0x01 0x04 0x07
16MHz 0x80 0x01 0x0a 0x01 0x80 0x01 0x04 0x09
25MHz 0x80 0x01 0x0a 0x00 0x80 0x01 0x04 0x03
32MHz 0x80 0x01 0x0a 0x01 0x80 0x01 0x04 0x04
40MHz 0x80 0x01 0x0a 0x01 0x80 0x01 0x04 0x03
50MHz 0x80 0x01 0x0a 0x00 0x80 0x01 0x04 0x01
80MHz 0x80 0x01 0x0a 0x01 0x80 0x01 0x04 0x01
100MHz 0x80 0x01 0x0a 0x00 0x80 0x01 0x04 0x00