The LA-2729 and LA-3770 are both IDC20A-to-MIPI converters, but they differ in the signal assignment of the upper 10 pins of the MIPI-20 connector.
Key differences:
LA-2729 uses a MIPI-20T connector with the following pin mapping:
Pin 12 = TRACECLK
Pin 14 = TRACEDATA[0]
Pin 16 = TRACEDATA[1]
Pin 18 = TRACEDATA[2]
Pin 20 = TRACEDATA[3]
LA-3770 uses a MIPI-20D connector with the following pin mapping:
Pin 12 = RTCK
Pin 14 = TRST-PULLDOWN
Pin 16 = TRST-
Pin 18 = EDBGRQ (EMU0)
Pin 20 = DBGACK (EMU1)
Notes
Most evaluation boards use a MIPI-20T pinout.
LA-3770 can be reconfigured (solder bridges) for MIPI-20T.
For further details, refer to the Arm Debug and Trace Interface Specification.
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