Hierarchical testing using the IEEE Std 1149.5 module test and maintenance slave interface module

An IEEE Std 1149.5 MTM-Bus Slave interface module is presented, which is used for direct access to 1149.1 chip-level buses and hierarchical test. All the standard 1149.1 functions, such as SAMPLE/PRELOAD, EXTEST, BYPASS, and even RUNBIST, can be performed within three 1149.5 Read/Write-Data message cycles. The messages are transmitted between the MTM-bus Master module (M-module) and the Slave module (S-module). We adopt the Full TAP Control (FTC) method to activate the 1149.1 Boundary-Scan paths via the 1149.5 MTM-Bus. A personal computer is used as the M-module