A reusable, low-cost, and flexible multidrop system JTAG' architecture has been developed at Brocade as an alternative to more expensive commercial solutions. This architecture allows JTAG operations to be driven by a local on-board processor or an external host. An adddrop network design allows all on-board JTAG devices to be grouped into several smaller chains and enables the chains to be combined flexibly for various JTAG operations. By implementing this architecture in a lowcost Complex Programmable Logic Device (CPLD), it has been used in stand-alone single-board systems as well as complex multiboard chassis systems at Brocade.
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