Known Problems

The front end chips (GTFE) and controller chips (GTRC) have to be configured before sensible data are read out. The purpose to configure the tracker is to ensure that all layers are read out, there is a valid fastOr signal for every layer and that noisy channels are masked from the trigger (or data if required).

The following list summarizes known problems for the eight read out cables.

Cable 0

: No problems.

Cable 1

: R1 controller type.

1. GTRC4: The fastOr is stuck high between GTFE 3 and 4. If these chips are read to cable 1 the fastOr will always be high. If only GTFE 5 - 24 are read to the controller the fastOr is good.
2. GTRC1: If read out there are always about 63 hits, mostly from GTFE 24. This means that data of this layer can't be read from this side but should be read from cable 0.

Cable 2

: No problems.

Cable 3

: No problems.

Cable 4

: R1 controller type.

1. GTRC2: The fastOr is stuck high between GTFE 23 and 24. In order to obtain a valid fastOr only GTFE 24 is allowed to be read.

Cable 5

: R0 controller type.

1. GTRC3: The fastOr is stuck high between GTFE 0 and GTRC. No valid fastOr is possible.

Cable 6

: No problems.

Cable 7

: No problems.