JTAG connection is incomplete

Problem environment

Chip programming occurs over SWD or JTAG interfaces which may support various serial debugging features such as daisy chaining.

Steps to reproduce

1. Refer to the schematic
2. Locate programming connectors
3. Examine for supported interfaces

Expected result

JTAG communication using TDI, TDO, TMS, TCK signals is supported.

Actual result

Only SWD communication using SWDCLK and SWDIO is supported.

Consequences

Because a full JTAG interface is required for daisy chaining, multiple hardware debuggers are needed to properly design a test jig.

Workaround

Integrate multiple hardware debuggers and connect them with USB interfaces.

Severity level

This is low priority because project requirements do not mandate a debugging interface.

There is little chance of routing traces to the extra JTAG contacts within current resource levels.