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Next: Appendix: List of Known Up: Appendix: Pad Description Previous: Top side pads

Core pads

Some pads have been located in the chip's core. Most of them are for diagnostic purposes, but on Helix128-2.x pad no. 267 SufixTokenOut and no. 268 HelixTokenIn play an important role in the daisy chain token scheme; in Helix128-2.2/2.3 SufixTokenOut can also be obtained from the top side (pad no. 246). The pads for Helix128-2.0 and Helix128-2.1 are explained in table 19 on page [*], the pads for Helix128-2.2/2.3 in table 20 on page [*].


 
Table 19:  Description of the Helix128-2.0 and Helix128-2.1 core pads. The first pad in the table corresponds to the lowest right hand side core pad (with the frontside left).
Ref. no. Pin name Type Description
267 SufixTokenOut output initial token out of first chip in daisy chain; to be bonded to pad no. 268 HelixTokenIn for the first chip in a daisy chain and for single chip operation (otherwise not to be connected)
268 HelixTokenIn input internally connected to the adjacent pad no. 182; to be bonded to pad no. 267 SufixTokenOut for the first chip in a daisy chain and for single chip operation (otherwise not to be connected)
269 TrigMon test outp. test pad to probe the TrigMon signal (no connection needed for normal operation)
270 WriteMon test outp. WriteMon signal
271 Trigger test outp. Trigger signal
272 notTrigger test outp. notTrigger signal
273 notReset test outp. notReset signal
274 notTReset test outp. notTReset signal
275 Voffset test outp. buffer Voffset voltage
276 Vdcl test outp. pipeamp Vdcl voltage
277 Vd test outp. pipeamp Vd voltage
278 VcompRef test outp. comparator VcompRef voltage
279 Vfs test outp. shaper Vfs voltage
280 Vfp test outp. preamplifier Vfp voltage



 
Table 20:  Description of the Helix128-2.2/2.3 core pads. The first pad in the table corresponds to the lowest right hand side core pad (with the frontside left).
Ref. no. Pin name Type Description
267 SufixTokenOut output initial token out of first chip in daisy chain; to be bonded to pad no. 268 HelixTokenIn for the first chip in a daisy chain and for single chip operation (otherwise not to be connected)
268 HelixTokenIn input internally connected to the adjacent pad no. 182; to be bonded to pad no. 267 SufixTokenOut for the first chip in a daisy chain and for single chip operation (otherwise not to be connected)
269 TrigMon test outp. test pad to probe the TrigMon signal (no connection needed for normal operation)
270 WriteMon test outp. WriteMon signal
271 Trigger test outp. Trigger signal
272 notTrigger test outp. notTrigger signal
273 notReset test outp. notReset signal
274 notTReset test outp. notTReset signal
275 Voffset test outp. buffer Voffset voltage
276 Vdcl test outp. pipeamp Vdcl voltage
277 Vd test outp. pipeamp Vd voltage
278 VcompRef test outp. comparator VcompRef voltage
279 Vfs test outp. shaper Vfs voltage
280 Vfp test outp. preamplifier Vfp voltage



  
Figure 18: Schematic drawing of the Helix128-2.0 pad locations. The overall chip dimension is 14,385$\mu$m x 6,146 $\mu$m; the frontside (facing the detector) is the bottom side in this view; in the descriptions we will refer to this side as the left side in regard of the ``normal'' signal flow from left to right
\begin{figure} \centerline{ \epsfig {file=Helix128S-2Pads.eps,height=20cm} }\end{figure}


  
Figure 19: Schematic drawing of the Helix128-2.1 pad locations. The Sclk and Rclk pads are now differential CMOS inputs.
\begin{figure} \centerline{ \epsfig {file=Helix128-2.1Pads.eps,height=20cm} }\end{figure}


  
Figure 20: Schematic drawing of the Helix128-2.2/2.3 pad locations. Token pads and power supply pads for the comparator outputs have been added.
\begin{figure} \centerline{ \epsfig {file=Helix128-2.2Pads.eps,height=20cm} }\end{figure}


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Figure 21: Schematic drawing of the Helix128-3.0 pad locations.
\begin{figure} \centerline{ \epsfig {file=Helix128-3.0Pads.eps,height=20cm} }\end{figure}


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next up previous contents
Next: Appendix: List of Known Up: Appendix: Pad Description Previous: Top side pads

Martin Feuerstack
2/3/1999