Layer and Treq Names

The lowest and top most layer of the prototype tower (btem) are y-layer, i.e.: they measure the y coordinate (the strips run parralel to x). In the documention Tracker Tower Stack Addressing the lowest and top most layers where assumed to be x-layers.

One word to the usage of left and right. We use left and right only for the kapton cable. Looking at a side of the btem, the cable to your left is the left cable(L) and the cable to your right is the right cable(R). :)
Early versions used left and right for the controller chips, but is not used any more. The two controller chips on a hybrid are controller R0 and R1. Each cable is connected to a specific type of a controller chip.


cable cable type controller type read during beamtest
0 L R0 yes
1 R R1 no
2 L R1 no
3 R R0 yes
4 L R1 no
5 R R0 yes
6 L R0 yes
7 R R1 no

The following table shows the naming convention for the tracker layers and the assosiated treq signals of the TEM VME board.

Y-layers
layer cable gtrc Adrs. treq pin
y0 0 0 xL0 P9, 17
y1 5 0 xR1 P8, 3
y2 0 1 xL2 P4, 15
y3 5 1 xR3 P3, 5
y4 0 2 xL4 P18, 15
y5 5 2 xR5 P5, 5
y6 0 3 xL6 P5, 1
y7 5 3 xR7 P9, 16
y8 0 4 xL8 P9, 11
y9 5 4 xR9 P18, 10
y10 0 5 xL10 P6, 14
y11 5 5 xR11 P7, 14
y12 0 6 xL12 P6, 20
y13 5 6 xR13 P5, 13
y14 0 7 xL14 P7, 11
y15 5 7 xR15 P5, 9
X-layers
layer cable gtrc Adrs. treq pin
x0 3 0 yR0 P18, 12
x1 6 0 yL1 P4, 13
x2 3 1 yR2 P7, 10
x3 6 1 yL3 P8, 1
x4 3 2 yR4 P3, 3
x5 6 2 yL5 P4, 20
x6 3 3 yR6 P9, 7
x7 6 3 yL7 P18, 11
x8 3 4 yR8 P7, 9
x9 6 4 yL9 P18, 16
x10 3 5 yR10 P8, 14
x11 6 5 yL11 P7, 15
x12 3 6 yR12 P6, 11
x13 6 6 yL13 P6, 2
x14 3 7 yR14 P6, 9
x15 6 7 yL15 P9, 6
Last modified: Mon Oct 9 08:26:59 PDT 2000