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SCANSTA112 - 7-port Multidrop IEEE 1149.1 (JTAG) Multiplexer

Description

The SCANSTA112 extends the IEEE Std.

1149.1 test bus into a multidrop test bus environment.

The advantage of a multidrop approach over a single serial scan chain is improved test throughput and the ability to remove a board from the system and retain test access to the remaining modules.

Features

  • n True IEEE 1149.1 hierarchical and multidrop addressable capability n The 8 address inputs support up to 249 unique slot addresses, an Interrogation Address, Broadcast Address, and 4 Multi-cast Group Addresses (address 000000 is reserved) 20051250 FIGURE 1. Typical use of SCANSTA112 for board-level management of multiple scan chains. © 2004 National Semiconductor Corporation DS200512 www. national. com SCANSTA112 20051251 FIGURE 2. Example of SCANSTA112 in a multidrop addressable backplan.

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Full PDF Text Transcription (Reference)

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SCANSTA112 7-port Multidrop IEEE 1149.1 (JTAG) Multiplexer May 2004 SCANSTA112 7-port Multidrop IEEE 1149.1 (JTAG) Multiplexer General Description The SCANSTA112 extends the IEEE Std. 1149.1 test bus into a multidrop test bus environment. The advantage of a multidrop approach over a single serial scan chain is improved test throughput and the ability to remove a board from the system and retain test access to the remaining modules. Each SCANSTA112 supports up to 7 local IEEE1149.1 scan chains which can be accessed individually or combined serially. Addressing is accomplished by loading the instruction register with a value matching that of the Slot inputs.
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