És un standard desenvolupat per el Joint Test Action Group , per simplificar la verificació de circuits impresos.
<mscgen caption="hola">
msc {
arcgradient = 8;
a [label="Client"],b [label="Server"];
a=>b [label="data1"]; a-xb [label="data2"]; a=>b [label="data3"]; a<=b [label="ack1, nack2"]; a=>b [label="data2", arcskip="1"]; |||; a<=b [label="ack3"]; |||;
}
</mscgen>
| Pinout JTAG | |||
|---|---|---|---|
| Senyal | PIN | PIN | Senyal |
| TCK | 1 | 2 | GND |
| TDO | 3 | 4 | VccInt |
| TMS | 5 | 6 | IO2/OEGI |
| IO3/RTCK | 7 | 8 | VccIO |
| TDI | 9 | 10 | GND |