Global Settings

Global settings are available from the Options menu in the main window. Auto command You may define the behavior of the Auto command (available from the Target menu in the main window). You can specify if the erasure of sectors during Auto is restricted to required sectors, selected sectors or not restricted at all. In the latter case all sectors are erased during the Auto procedure. Log level In addition to that you may set the default log level of J-Flash. Increasing log levels result in more information logged. Miscellaneous Finally there are some checkboxes that define if J-Flash should disconnect from a connected device when it has finished its operations, if blank sectors should be skipped during read operations, and if sectors should be unlocked during program-ming.

Project Settings

The project settings may be configured by selecting Project settings... from the Options drop-down menu or by using the ALT-F7 keyboard shortcut. General Settings The General tab is used to identify the location of the J-Link. The J-Link can either be connected directly over USB to the host system of J-Flash, or it can be connected through the J-Link Server running on a remote system. Please refer to the J-Link manual for more information regarding the operation of J-Link and J-Link Server.

JTAG settings

Operational Speed The Target Interface tab identifies the operational speed of the JTAG before and after initialization. The radio buttons permit the values to be either automatically determined or defined by the user to a value between 30kHz and 8MHz. Since software version 3.80 J-Flash supports SWD as target interface. To select SWD as target interface, simply select SWD from the dropdown box and define the speed settings. Multiple devices on JTAG bus If the JTAG is to have multiple devices connected to it at once, the JTAG scan chain with multiple devices check box must be selected. In this case, the TCK and TMS lines of all JTAG device are connected, while the TDI and TDO lines form a bus. The location of the first device to be connected is selected from the Position drop-down menu.

Instruction length is defined by the manufacturer of the device. For ARM chips, the Instruction Register (IR) length is four, which is why the value of IRLen is by default set to four times the position indicated. This works fine for ARM only scan chains. However, if any other devices are introduced to the chain and must be traversed to get to the first device, the IRLen must be modified accordingly.

CPU Settings

The ARM tab allows the selection of microcontroller dependent settings. The chip type is selected from the Chip drop-down menu and the other dialog items are set to default values of the chosen chip.

External devices

In order to use J-Flash with an external device, generic ARM7/ARM9 must be selected from the Chip drop-down menu.

Internal devices

To program internal flash devices choose the respective chip type from the Chip drop down menu. If the chip type desired is not found on this list, please contact Segger as new microcontrollers are continuously being added.

Endianness

The endianness of the chip is indicated through the Endian drop-down menu.

Core ID

If the core ID is known for the device to be programmed, it can be used to verify that the device in communication via the J-Link is the intended device.

Target RAM

The "Use target RAM" check box may be selected to make use of the RAM to speed up the communication with the target device. To use the target RAM, a start location in RAM and the amount of RAM to be used must be entered here.

Auto command You may define the behavior of the Auto command (available from the Target menu in the main window). You can specify if the erasure of sectors during Auto is restricted to required sectors, selected sectors or not restricted at all. In the latter case all sectors are erased during the Auto procedure.

Flash Settings

The settings found on the Flash tab are adjusted to match the type and characteristics of the flash chip being programmed.

Base Address The base address and organization of the chip should be entered, followed by the selection of the flash device.

Flash device selection The selection of the flash device is facilitated via the Select flash device button. After invoking this button a table will be presented. The table may be filtered using the manufacturer name. The chip and its attributes (manufacturer name, device name, size, number of sectors, eight bit identifier, sixteen bit identifier, algorithm, bus width) must be selected from this table. If the flash chip is not found please contact Segger, as devices are continuously being added to this list.

ID checking

There are two other check boxes that are of interest in this subsection which are Check manufacturer flash Id and Check product flash Id. These check boxes should be selected to confirm the type of device that is in communication with J-Flash.

Sector selection

The final section of this tab indicates the sectors to be acted upon, whether they are to be cleared, read back, or written. An individual or series of sectors may be selected from the predetermined valid range (determined from the Select flash device table). This ensures proper communication with the chip.