Artesyn MVME2502 Installation and Use (April 2015) User Manual Page 107

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Functional Description
MVME2502 Installation and Use (6806800R96E)
107
4.20.2 JTAG Chain and Board
The MVME2502 is designed to work with separate JTAG board rather than with an on-board
JTAG multiplexer. The chip supports up to a 6-scan port and the board’s boundary scan requires
the following to function: ASSET hardware, JTAG board, and JTAG cable. The MVME2502
provides a 60-pin header that connects to the JTAG board via customize cable.
The JTAG bypass will connect when no XMC or PMC is connected to its corresponding locations.
Once an external XMC or PMC is un-mounted its corresponding JTAG bypass will close, to
complete the JTAG chain.
The JTAG board provides three different connectors for the ASSET hardware, flash
programming and the MVME2502 JTAG connector. The board is equipped with TTL buffers to
help improve the signal quality as it traverses over the wires.
Figure 4-4 JTAG Chain Diagram
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