AR1FS Debugging Guide Critical Components Mitch Newcomer August 8 2004.

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Presentation transcript:

AR1FS Debugging Guide Critical Components Mitch Newcomer August

Introduction Diagnostic test programs often indicate symptoms that are not sufficient to uniquely identify board problems. This guide provides expected measured values at key locations on AR1FS for chip and board control functions. Since all active roof boards use the same ASIC triplet, values will be the same for all boards although topology will be different. It should be a simple matter to identify locations on other boards by using silk screen indicators and measured values from this guide to match up with locations on the board of interest.

AR1FS DTMROC Side UP Data Connector Power Connector DTMROC #1 Vertex Termination area

AR1FS Termination Area Cin +,-.86V, 1.2V BX +,-.99V, 1.02V Reset +,-.88, 1.2V Each Leg of the termination resistors Connects through a 50 ohm resistor to a common node Cout +,- 1.12V, 1.13V Two 60 ohm resistors to independent node. TEST (pwr off) Across +,- connection data cable unplugged 120 ohms, plugged to patch panel = 60 ohms TEST (pwr off) across +,- nodes Without data cable plugged in 100 ohms. Test at far end of Cable for full continuity test Add ~ 20 ohms for cable.

AR1FS (top) DTMROC Control TP Bias 18k, (16k) 1.13V TP Even 10, (7.5k) 2.39V TP Odd 10, (7.5K) 1.30V Lo Th 1 1k, (6.5k) 1.29V Hi Th 1 1k, (6.5k) 1.28V Lo Th 0 1k, (6.5k) 0V ADJ12 1k, (??k) 1.28V Hi Th 0 1k, (6.5k) 1.28V Xenon Select 1k, (11.8K) 0V (location varies side to side of DTMROC) Stuffed, Meas (Res), Voltage to gnd.

AR1FS (top) DTMROC Control TP Bias 18k (16k) TP Even 10 (7.5k) TP Odd 10 (7.5K) Lo Th 1 1k (6.5k) Hi Th 1 1k (6.5k) Lo Th 0 1k (6.5k) ADJ12 1k (??k) Hi Th 0 1k (6.5k) Xenon Select 1k (location varies side to side of DTMROC)

1FS Bottom Side Resistors 4.7 ohm Preamp Filter Green box. Lo gain Thresh. Ramp No test pulse response. 12K ohm Ternary Output reference Red box Outputs always high if missing. Stuffing errors that affect the performance of a whole ASDBLR ASIC.