Parallel Port JTAG Tester

Hardware

This page documents a rudimentary hardware/software package which may be used to test the JTAG on an MDT chamber using a PC with a small parallel port adapter card.

The hardware is a small PC board which plugs directly on to the parallel port of a PC. It requires an external 3.3V supply (two alkaline batteries work nicely).

IMPORTANT: The ground (negative) side of the 3.3V supply should be connected to MDT chamber ground.

Connect an RJ-45 cable from the connector marked "JTAG OUT" to JTAG IN on the mini-adapter (connector closest to the corner of the board).
Connect another cable from JTAG IN on the parallel port board to JTAG OUT on the mini-adapter.

Software

At the moment only a simple command-line program exists, ported from unix.

Installation

Download mezz_test.zip and porttalk22.zip and unzip in an otherwise empty directory.
Copy porttalk.sys to your C:\WINNT\system32\drivers directory.
(you should only actually need mezz_test.exe and porttalk.sys, but the other files are required for compiling and documentation)

The porttalk.sys driver comes from HERE (beyondlogic.org). The supplied executable was compiled using the MinGW compiler as follows:

gcc -I. jtag_fun.c mezz_test.c -o mezz_test

This should work with other compilers, but YMMV. Execution mezz_test -n 9 Run a test on a chain with 9 mezzanine boards mezz_test -n 9 -r Same test, but repeat forever and print error summary mezz_test -n 9 -s Run with JTAG single step (not typically useful) Here is what the output from mezz_test -n 9 looks like when everything works: Starting mezz_test. 9 mezz cards. repeat=0 IR path length = 45...ok Bypass length is 9...ok Config length is 1620...ok ASD control length is 1440...ok [ 0] GOT AMT ID [ 1] GOT AMT ID [ 2] GOT AMT ID [ 3] GOT AMT ID [ 4] GOT AMT ID [ 5] GOT AMT ID [ 6] GOT AMT ID [ 7] GOT AMT ID [ 8] GOT AMT ID