Difference between revisions of "JTAG explorer toy"
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− | [[Image: | + | [[Image:Batman.jpg|thumb|'''Fig.1: batman.''' Holy mackerel, Batman! JTAG really is <tt>the shit</tt>!]] |
− | [[Image: | + | [[Image:michai_015_schem.jpg|thumb|'''Fig.2: schematics.''' The only slightly interesting bits are the 4 TAP-lines going between the MCU's, and the fact they share mutually-exclusive use of the serial Tx-line (the Rx-line is always shared).]] |
− | [[Image: | + | [[Image:michai_015_bscan.jpg|thumb|'''Fig.3: JTAG boundary-scan chain.''' A host talks to the TAP (''Test Access Port'') controller using 4 lines, shifting data in and out.]] |
− | [[Image: | + | [[Image:michai_015_bsc.jpg|thumb|'''Fig.4: 2 JTAG boundary-scan cells.''' One cell sits between core logic and an input pin, and the other sits between core logic and an output pin.]] |
− | [[Image:michai_015_board.jpg|thumb|'''Fig. | + | [[Image:michai_015_components.jpg|thumb|'''Fig.5: 'before'.''' The big MCU there (ATmega32) is horribly oversized both in size and ability for this application, but ok, was all I had.]] |
+ | |||
+ | [[Image:michai_015_board.jpg|thumb|'''Fig.6: 'after'.''' Finished toy-board. The funny thing is that when it's finished and toying has been done, it'll totally useless.]] | ||
== LALALA == | == LALALA == | ||
la. | la. |