Boundary scanning element and communication equipment using the same
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United States of America Patent
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Mar 2, 2004
Grant Date -
N/A
app pub date -
Nov 23, 1999
filing date -
Jun 2, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A boundary scan element includes a plurality of input terminal side boundary cells connected in series; a plurality of output terminal side boundary cells connected in series; a TAP circuit for controlling input/output of data to/from the boundary cells on the input/output terminal sides; a TDI terminal for receiving serial data to be supplied to the boundary cells; a TDO terminal for outputting the data from the boundary cells as serial data; a TCK terminal for receiving clock signals; and a TMS terminal for receiving a mode signal to switch an operation mode of the TAP circuit, wherein the boundary cells on the input/output terminal sides are connected in parallel between the TDI and TDO terminals, respectively, and wherein two sets of combinations composed of the input terminal side boundary cells, the output terminal boundary cells, the TDI terminal, the TDO terminal and the TAP circuit are provided.
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