How To Fix Error Jtag 9?

 

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If you are facing jtag error 9, this guide may help you.

 

 

The debugger tries to iterate over the jtag for related devices. Usually, almost all devicesYou in the chain create their own IDCODEs so that the debugger can identify these types of devices. In your case, TDO is by default high for the country, so the purchased device is not found. Please check the Jtag connection, on-board cable switch settings, etc. Executing the ‘jtag Targets’ command may provide a little more information

Various schema failures can cause the JTAG chain to fail. This Application Note describes the most common errors and how you can use the JTAG String Debugger to find the cause of this issue.

1. Count the number of devices in any chain.
2. Read the identification code of each device and search the Internet for the corresponding BSDL files in the current library.
3. Measure the total length of in-chain instruction messages and examine them while struggling with the generic append data expected in BSDL files.
4. For each Kindle in the chain, measure the length of the template and compare it to the advantage given in its BSDL file.

This confirms the correct functioning and functioning of the JT chainAG, and it is recommended that you run this test as part of your project creation. It can be run by clicking the Test Chain button at the bottom of the JTAG Chain Debugger screen:

• One of the handheld signals (TDI, TMS, TCK or TDO) is usually open or shorted like errors 1 and 4 in Figure 2
• One of the common signals (TMS or TCK) has always been an open circuit for one device, such as error 2 shown below.
• One of the types of connections between lost devices – error 3.
• One of the devices happened during the reset, such as error 5. This is probably the most commonly observed problem.

If a single failure occurs, all devices will continue to function, and therefore their ID codes will be successfully read during supply chain validation. However, the test also numbers the number of devices on the line, putting them all in BYPASS mode, synchronizing the known data model throughout the chain and waiting for that model to emerge from the final TDO. Error 1 prevents this, and therefore the web interfaces report that it was not possible to count The number of devices with a string, although they or even ID codes are displayed.

If there is a 2 error on one (i.e. IC One has significant missing TCK and / or TMS signal), no number can be synchronized from its TDO pin. If the error usually occurs on the terminal, the data in the string will not be found. If this happens in conjunction with the previous device in the chain, the web data will be read from the last TDO so that the next device ID of the affected device is always captured correctly; The affected device ID and the oldest ID are missing on the line. Since the data in your TDI cannot be synchronized across a perfect chain, the control test chain thinks it cannot count the device group.

In the event of error 3, all data is transferred between devices, although all device ID codes are read correctly after an interrupt. Therefore, the number of readable codes may not correspond to the number of cars on the card. As the data flows through the chain, the supply chain test will determine if Whether she can count the number of devices.

If error 4 occurs, the special effect will be the same as if the last device in the chain could not have a TMS or TCK signal, was detected during a reset, or needs to check the reset sequence, but it was wrong. applicable. Checking the supply chain shows that absolutely reliable data was available.

If the device has error 5, i.e. H. it may be reset (or the meaningful test reset sequence has not been applied effectively), this may not motivate its TDO conclusion. If, in addition to the fault, the device is the last one on another channel, it means that data is probably not being read from the channel. If the affected device is at a higher level in the chain, the test can check the device ID codes after the particular device is held in a reset state. In both examples, the data cannot be synced across the entire system, which means the daisy chain test also reports an error when counting the number of devices.

Examples

These errors are detected by performing a validation of the entire supply chain. The possible test results and their relationship to these various errors are described below using a chain with two JTAG devices as an example.

Example 1. All Identification Codes Are Read, But The Number Of Devices Is Not Counted

Since the identification codes of both devices were read very correctly, the following conclusions can be drawn:

• TCK and TMS are working correctly (i.e. no error 2) for both devices. Link
• communication with devices is not broken (i.e. not only error 3).
• The latest version of TDO is installed correctly (i.e. no error 4). Device
• nobody gets reset too often (i.e. not error 5).

The number of devices is counted by inserting the best known sequence into the TDI pin of the first specific device. Since XJTAG was unable to count the number of devices, it can be concluded that the TDI signal has not yet reached the first device in the entire chain.

Example 2: Some Identification Codes Also Lack The Quantity your Unreported Devices

Since some identification codes have been read, how the target device should work correctly:

• TCK and TMS work fine on the edge device (i.e. not error 2 on a new device).
• The last TDO is synonymous (i.e. not error 4).
• The last device in the entire chain is undefined (i.e. not error 5 on the last device).

Therefore, the error must come from 1 device or connection between multiple devices and can certainly be caused by one of the following problems:

• Although TMS and tck work fine on the second device, one or both of these signals are only open on the first device.
• Two additional devices are not connected to each other (error 3).
• Incredibly the first device in the chain is present during a reset, or requires a reset of a test sequence that was not running correctly (error 5) .3:

Example No Valid Data Returned

In this example, no valid data is being sent from the TDO. This may be due to a few problems:

• TMS and / or TCK for absolute value, the device is not working correctly (error 2).
• Last TDO is invalid (connection error 4)
• The last device in the chain is probably resetting (error 5) or requires an incorrect test reset sequence.

Manual Debugging

To determine the root cause of the problem, you can perform a continuous JTAG reset cycle and then verify the ID code by clicking Scan ID Codes from the Test Chain drop-down menu. When the JTAG Chain Debugger is set to this mode, resources continuously flow through the chain, providing an oscilloscope that can be used to determine the cause of a specific problem.

 

 

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