Bottom pads

The bottom pads of Helix128-2.0/2.1 are explained in table 9 on page . The bottom pads of Helix128-2.2/2.3 are explained in table 10 and 11 on page and , respectively.

 

 

Ref. no. Pin name Type Description

133,134 Gnda supply analog ground (0V)

135,136 Vssa supply negative analog supply voltage (-2V)

137,138 Vdda supply positive analog supply voltage (+2V)

139 VssComp supply negative supply voltage for comparator (-2V)

140 VddComp supply positive supply voltage for comparator (+2V)

141 notCompClk input active low comparator dummy clock

142 CompClk input active high comparator clock

$$\Rightarrow$$ 143 CompPol input

$$\langle \rangle$$ 144 720ORed active low output of comparators on channels 127...124

$$\langle \rangle$$ 145 725ORed active low output of comparators on channels 123...120 146-173

$$\langle \rangle$$ 174 731ORed active low output of comparators on channels 7...4

$$\langle \rangle$$ 175 736ORed active low output of comparators on channels 3...0

176 MuxDisable Out of use

177 TransmitEnable -2V disables analog data transmission

178 FifoFull output indicates readout fifo overflow.

179 HelixTokenIn input 746to be connected to pad no. 257 HelixTokenOut of predecessing Helix128-2.0/2.1 if the chip is nonleading in a daisy chain (not to be connected for single chip operation and if the chip is the first in a daisy chain)

180 ReturnTokenOut output 749to be connected to pad no. 256 ReturnToken-In of predecessing Helix128-2.0/2.1 if the chip is nonleading in a daisy chain (not to be connected for single chip operation and if the chip is the first in a daisy chain)

$$\langle \rangle$$ 181

$$\langle \rangle$$ 182 `` 183-185

$$\langle \rangle$$ 186 766 ``

187-197 n. c.

 

 

Ref. no. Pin name Type Description

133,134 Gnda supply analog ground (0V)

135,136 Vssa supply negative analog supply voltage (-2V)

137,138 Vdda supply positive analog supply voltage (+2V)

138a GndComp supply Reference voltage for comparators' AC coupling

139 VssComp supply negative supply voltage for comparator (-2V)

140 VddComp supply positive supply voltage for comparator (+2V)

141 notCompClk LVDS-input active high comparator dummy clock

142 CompClk LVDS-input active low comparator clock

$$\Rightarrow$$ 143 CompPol input

$$\langle \rangle$$ 144 787ORed active low output of comparators on channels 127...124

$$\langle \rangle$$ 145 792ORed active low output of comparators on channels 123...120 146-173

$$\langle \rangle$$ 174 798ORed active low output of comparators on channels 7...4

$$\langle \rangle$$ 175 803ORed active low output of comparators on channels 3...0

$$\langle \rangle$$ 176 VssComp supply

177 TransmitEnable -2V disables analog data transmission

178 FifoFull output indicates readout fifo overflow.

$$\langle \rangle$$ 178a VssComp supply

 

 

Ref. no. Pin name Type Description

179 notHelixTokenOut output Reserved for future use

180 notReturnTokenIn input Reserved for future use

180a ReturnTokenIn input return path token input; must be bonded to pad no. 187 HelixTokenOut if the chip is the last in the daisy chain and for single chip operation (otherwise bonded to pad no. 257a ReturnTokenOut of following chip in the daisy chain)

$$\langle \rangle$$ 181

$$\langle \rangle$$ 182 833 `` 183-185

$$\langle \rangle$$ 186 839 ``

187 HelixTokenOut output must be bonded to pad no. 180a Return-TokenIn if the chip is the last in the daisy chain and for single chip operation (otherwise bonded to pad no. 251 HelixTokenIn of following chip in the daisy chain)

188 notFailsafe- output Reserved for future use HelixTokenOut

189 notFailsafe- input Reserved for future use ReturnTokenIn

190 Failsafe- input Reserved for future use ReturnTokenIn

191 Failsafe- output Reserved for future use HelixTokenOut

192 n. c.

193-197a Removed

 

 

Ref. no. Pin name Type Description

179 n. c. Reserved for future use

180 notReturnTokenIn input Reserved for future use

180a ReturnTokenIn input return path token input; must be bonded to pad no. 187 HelixTokenOut if the chip is the last in the daisy chain and for single chip operation (otherwise bonded to pad no. 257a ReturnTokenOut of following chip in the daisy chain)

$$\langle \rangle$$ 181 input (int. synchronicity monitoring input from

pullup) neighbouring Helix128-2.2/2.3

$$\langle \rangle$$ 182 input (int.

pullup) [-1.5ex] `` 183-185

$$\langle \rangle$$ 186 input (int.

pullup) [-1.5ex] ``

187 HelixTokenOut output must be bonded to pad no. 180a Return-TokenIn if the chip is the last in the daisy chain and for single chip operation (otherwise bonded to pad no. 251 HelixTokenIn of following chip in the daisy chain)

188 n. c. Reserved for future use

189 874notFailsafeReturnTokenIn input 876To be connected to notFailsafeReturnTokenOut of the next but one chip in the chain.

190 878FailsafeReturnTokenIn input 880To be connected to FailsafeReturnTokenOut of the next but one chip in the chain.

191 882FailsafeHelixTokenOut output 884To be connected to FailsafeHelixTokenIn of the next but one chip in the chain.

192 n. c. Reserved for future use

193-197a Removed