JTAG Interface
8
JTAG Interface
The MV78100 JTAG interface is used for chip boundary scan as well as for CPU cores debugger.
TAP controllers implementation is described in the diagram below.
Figure 5: MV78100 TAP Controller
J_TDI
J_TCLK
J_TRST
J_TMS_CPU
CPU TAP Controller
CPU TDO
J_TDO
MV78100
TAP Controller
J_TMS_CORE
Boundary Scan TDO
The MV78100 supports the following test modes:
Boundary scan: In this mode, keep J_TMS_CPU high; this will reset the CPUs TAP controllers
and mux the boundary scan TDO signal on the J_TDO pin.
CPU debugger: In this mode, keep J_TMS_CORE high; this will reset the MV78100 TAP
controller and mux the CPU TDO signal on the J_TDO pin.
Copyright © 2008 Marvell
MV-S104552-U0 Rev. D
December 6, 2008, Preliminary
Document Classification: Proprietary Information
Page 59
MARVELL [ MARVELL TECHNOLOGY GROUP LTD. ]
