| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a memory chip of which the general purpose port can be used as JTAG(Joint Test Action Group). SOLUTION: A memory chip, which uses a multi pin port as a JTAG port, is provided with a JTAG controller 16, at least, one internal block 32, and a composition unit, and one four-pins of the multi pin port of the chip is selectively composed by the composition unit, and the JTAG data is transmitted to the JTAG controller 16 or non-JTAG data is transmitted to at least one internal block. The composition unit can permanently or changeably be composed in general. For example, a composition unit, which can be changed, is a volatile memory(VM) composition unit 42 or it can be a product term output part of programmable logic device(PLD).</p> |
