Can I connect the FX3 to the JTAG IEEE 1149.1 chain with other chips?

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SeZa_724116
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Can I connect the FX3 to the JTAG IEEE 1149.1 chain with other chips?
How many bits are in the Instruction Register?
Does FX3 support the BYPASS command?

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1 Solution
JayakrishnaT_76
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First question asked 1000 replies posted 750 replies posted

Hello,

Please find my comments for your questions below:

Can I connect the FX3 to the JTAG IEEE 1149.1 chain with other chips?

>> You can connect FX3 to the JTAG IEEE 1149.1 chain with other chips but FX3 does not support boundary scan.

The JTAG pins of FX3 are directly connected to the ARM CPU and they do not support boundary scan. This is mentioned in the following KBA also.

BSDL File for FX3 - KBA86727

The JTAG interface on FX3 is used to debug the firmware through the CPU core's on-chip-debug circuitry. 

How many bits are in the Instruction Register?

>>The JTAG instruction register's length is 4 bits.

Does FX3 support the BYPASS command?

>> No, BYPASS command is not supported by FX3.

Best Regards,

Jayakrishna

Best Regards,
Jayakrishna

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3 Replies
JayakrishnaT_76
Moderator
Moderator
Moderator
First question asked 1000 replies posted 750 replies posted

Hello,

Please find my comments for your questions below:

Can I connect the FX3 to the JTAG IEEE 1149.1 chain with other chips?

>> You can connect FX3 to the JTAG IEEE 1149.1 chain with other chips but FX3 does not support boundary scan.

The JTAG pins of FX3 are directly connected to the ARM CPU and they do not support boundary scan. This is mentioned in the following KBA also.

BSDL File for FX3 - KBA86727

The JTAG interface on FX3 is used to debug the firmware through the CPU core's on-chip-debug circuitry. 

How many bits are in the Instruction Register?

>>The JTAG instruction register's length is 4 bits.

Does FX3 support the BYPASS command?

>> No, BYPASS command is not supported by FX3.

Best Regards,

Jayakrishna

Best Regards,
Jayakrishna
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Hello,

Thanks for your reply.

Where can I get a description of the JTAG instructions supported by the FX3?

Best Regards,

Sergey

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Hello,

As mentioned in my previous response, the JTAG pins of FX3 are directly connected to the ARM CPU (ARM926EJ-S) but does not support boundary scan. So, whatever JTAG instructions are supported by the ARM CPU will be supported by FX3 also.

Best Regards,

Jayakrishna

Best Regards,
Jayakrishna
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