CCONT Serial interface Troubleshooting

If there are problems in CCONT's serial control interface, self tests fail and there is "Contact service" shown on the display. Wintesla shows this fail as "CCONT Interface".

NOTE: Low level means 0V, high level means approximately 2.8V.

Figure 33.

(Note: Measurement should show 2.17MHz square wave. This interface is connected to CMT display also, so there is other activity too. The 3.1MHz clock is targeted for CMT display, do not worry about that. The clock signal is low when inactive.)

1. Measure all the three lines simultaneously (Figure 34).

Set the trigger to CCONTCSX line falling edge.

You should see the two cases, Figure 34 and Figure 35 .

(Channel 1-GENSClk,

Channel 2-CCONTCSX,

Channel 3-GENSDIO). High level is about 2.8V

Tek LiMiH 50.QMS/s 30 Acqs

Tek LiMiH 50.QMS/s 30 Acqs

Will 2. 00 V Ch2 2. 00 V M l .'otitis' Ch2 V i .24 V g \ov 1999

Figure 34.

Will 2. 00 V Ch2 2. 00 V M l .'otitis' Ch2 V i .24 V g \ov 1999

Figure 34.

Technical Documentation 8. Troubleshooting

MADLinda writes to CCONT. The data at sixth bit is '0' as marked with the cursors. The data after the read/write bit varies, just like the address before the bit. If you can see this kind of traffic, MADLinda side of the interface is functioning correctly.

Tek LiMiH 50.0MS/S 7 Acqs

Tek LiMiH 50.0MS/S 7 Acqs

[«<¡11 2. 00 V Ch2 2. 00 V M l .OOus Ch2 "V 1.24 V 9 \ov 1999

Figure 35.

[«<¡11 2. 00 V Ch2 2. 00 V M l .OOus Ch2 "V 1.24 V 9 \ov 1999

Figure 35.

MADLinda reads from CCONT. The data at sixth bit is '1', marked with the cursors. There should be data seen after the 'read' bit. All zero values may be read, but there should be other data seen, too. CCONT read cycles are fairly rare compared to write cycles. If there is not any non-zero reads from CCONT, the CCONT (N100) may be faulty.

8. Troubleshooting

Technical Documentation

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