All results were taken from the J-Link Commander output. Tests started with the flash either empty or erased, as flash erase times depend very much on the selected device. Sector sizes may grow for large devices. Please refer to the chip manual of the appropriate device to get information about erase times.
J-Link supports the programming of memory-mapped QSPI NOR flash via the standard methods described above. In the beginning, SPI NOR flash was usually a custom connection and not standardized, with advanced MCUs and QSPI flash memory-mapped made visible in the MCU address space. However, it eventually became a full replacement and even successor of parallel NOR flash. With J-Link, all features known from internal flash are also available in memory-mapped QSPI flash:
Note: Hardware breakpoints are not usable in QSPI flash on many Cortex-M based devices. This makes J-Link + flash breakpoints the only real option to debug in QSPI flash on these devices.
A customized flash algorithm is needed to program these devices. Customers can do this themselves using J-Link Device Support Kit, or SEGGER can help. Please contact firstname.lastname@example.org to request a quote.
SEGGER engineers have written, validated, and optimized the flash loaders, making sure they work reliably and deliver the best possible performance. SEGGER has hardware in-house for all supported devices and can re-test and give support to users.
All tests were performed by placing a 512 KB program into the flash memory of a blank STM32F417IG microcontroller connected via SWD interface. The SWD speed was selected at the maximum possible for each debug probe.
The J-Link also has the option of further software enhancements with the production flash programming utility (J-Flash). The ability to take full advantage of the development environment using the Unlimited Flash Breakpoint module also means you free your development from the hardware breakpoint restriction. In this test, J-Link is the clear winner.
J-Flash Lite is a free, simple graphical user interface which allows downloading into flash memory of target systems. J-Flash Lite is part of the J-Link Software and Documentation package, available for download here. How to perform downloading into flash via J-Flash Lite:
Flasher is a programming tool for all common devices with internal or external flash memory. For a list of all supported devices click here. Flasher ARM is designed for programming flash targets with the J-Flash software or stand-alone. Flasher can also operate as a normal J-Link.
J-Flash is an application that can program internal and external flash on ARM/Cortex devices. J-Flash can be used as a GUI-based application or in batch mode. It is available for Windows, Linux and macOS.
J-Flash is a PC software running on Windows (Windows 2000 and later) systems, Linux or macOS, which enables you to program the internal and external flash of your microcontroller via J-Link or Flasher.
Information on the performance values can be found in the tables below. Device series, program and program verification are indicated in the tables. They provide an illustration of example values with frequently used devices. This demonstrates the write performance for flash memory of J-Flash and J-Link.
Most modern MCUs have a dedicated QSPI unit on-chip that makes the QSPI flash memory mapped available in the MCU address space so that it can access the QSPI flash like parallel flash and directly execute instructions from it (execute-in-place, XiP). For most of such MCUs, QSPI flash programming is supported out-of-the-box. If it is supported for a specific MCU, please refer to the list of supported devices.
As SPI flash memories are not memory-mapped and can be connected to basically any SPI unit a MCU provides, there are no out-of-the-box algorithms available for that. However, customers can always add a flash bank and algorithm on their own for supporting such flashes by making use of the open flash loader functionality. For more information, please refer to the SEGGER Wiki.
There are no out-of-the-box algorithms available for that. However, customers can always add a flash bank and algorithm on their own for supporting such flashes by making use of the open flash loader functionality. For more information, please refer to the SEGGER Wiki.
As DataFlash memories are not memory-mapped and can be connected to basically any SPI unit a MCU provides, there are no out-of-the-box algorithms available for that. However, customers can always add a flash bank and algorithm on their own for supporting such flashes by making use of the open flash loader functionality. For more information, please refer to the SEGGER Wiki.
As NAND flash memories are not memory-mapped and can be connected in different ways to the MCU (dedicated NAND flash controller, just GPIOs, ...), there are no out-of-the-box algorithms available for that. However, customers can always add a flash bank and algorithm on their own for supporting such flashes by making use of the open flash loader functionality. For more information, please refer to the SEGGER Wiki.
Fortunately [Emil] was able to flash back a version of the firmware which was available on the internet, allowing the J-Link device to work again. This was not the end of the story, however, as after this the SEGGER software was unable to update the firmware on the device, due to a missing bootloader that was not part of the firmware image.
We also try to make our debug probes, in which we obviously put a lot of engineering efforts,available to students and hobbyists.J-Link EDU uses the same hardware and has the same features as a J-Link Base (+ unlimited breakpoints in flash memory), and is available for $63.50 on line.Our J-Link EDU Mini is available for just $18. A somewhat simpler hardware, not quiet as fast, but still really useful. Basically the same features when used on a Cortex-M.
Synology NAS/NVR comes with default licenses1 that allow you to set up and manage surveillance devices. Synology also provides three options for additional purchased licenses: 1, 4 or 8 Surveillance Device License Packs; each comes with a single license key, allowing you to activate 1, 4 or 8 surveillance devices at a time.
In the table above, you can see a detailed example of four different camera types. Certain panoramic cameras (e.g., Axis M3007) supporting on-camera dewarping may provide more than one stream (e.g., Quad View, Double Panorama, and Original View) at a time. Each regular and panoramic camera requires one license only.
There are two types of multi-lens cameras: fixed lens and removable lens. Most fixed lens cameras providing more than one stream at a time require only one license per camera. For fixed lens cameras with independent IP addresses or removable lens cameras, you will need one license per channel. For example, you can add as many as three lenses to Axis Q3709-PVE, which allows you to stream up to three channels. If you want to display all three channels in Surveillance Station, you will need three licenses. Take Axis F44 as another example. Axis F44 (with as many as four lenses) allows you to stream up to five channels, with four of the channels displaying footage from the four lenses, and the fifth channel combining the view of all four cameras. If you wish to display all five channels in Surveillance Station, you will need five licenses accordingly.
Video servers such as Vivotek VS8801 can connect to as many as eight analog cameras. In this case, you will need eight licenses accordingly. This rule also applies to video servers that are compatible with Surveillance Station.
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