HTM supports both 64-bit data buses and 32-bit data buses. An input signal, BUSWIDTH, indicates the bus width for current transfers. You can change this signal so that HTM can be shared between a 32-bit bus and a 64-bit bus. However, the change must only be performed when HTM trace is disabled.

When HTM64 is connected to a 32-bit bus, the higher 32 bits of the data inputs must be tied LOW. The BUSWIDTH input signal and the higher 32 bits of data bus are not available on HTM32.

See Bus select output for a description of the signals BUSENDIAN and BUSWIDTH. See HTM64 and HTM32 features summary for bus width information about HTM64 and HTM32 versions of HTM.