Introduction

Timestamp?

Table of Contents

1. Todo
2. Problems identified
3. CROC proto 3 : Fabrication status
   1. CROC v3 prototypes : present fabrication
   2. Final Number of CROC to be produced
   3. Output MCM on CROCv3 board
4. Compte-Rendus

Todo

• Implement the strobing of the bits [ 2 : 7 ] of the TTCrq channel broadcast
  
• Test the Fault lines
  

Problems identified

• Inversion of the SDA and SCL signal between the LV010 (near RJ45 of the front face of the CROC) and the SPECS Mezzanine connector
  
• Adaptation of the SPECS Signal in the case when the SPECS Mezzanine is simply a repeater
  
• Polarisation of the 2 drivers going to the backplane for specs sda- signals. the sda- is not well polarised and the V divider on the +sda simply changes the common mode. This leads to a bad pulse when the command to the driver is released. The sda- pin has to be polarised to GND with for example a 5k resistor. Then the sda+/- signals are well polarised.
  
• Correct Delatcher oscillation problem
  
• add screws to fix properly the TTCrq board
  
• Use an isolated bar to tighten the board
  
• Use small head screws to attach the isolated bar to the PCB (bottom of the board)
  
• Front face : IN/OUT vertical line should be interrupted and Ext Event should be replaced with NICOMATIC IN/OUT
  
• Modify serigraphy on the PCB of the board (SDA_LD_IN and OUT have to replaced, via should be separated to permit to plug several probes altogether)
  
• OutTrigSeqL0 must be connected to the Trigger AFTER the selection multiplexer
  
• Do we have to implement a swith to put on/off the NIM drivers (heat problems) ?
  
• Add a pole Zero compensation on the Specs Interface
  
• Add a capa on the clock line of the Specs Bus of the CROC
  
• Modification of the TTCrq connector
  
• Do we have to add a temperature probe
  
• Regis task Force : remove Ext Event from the front face of the croc

CROC proto 3 : Fabrication status

CROC v3 prototypes : present fabrication

CROC	Status	Download version(date)	Comment
1	Quick test
2	-

Final Number of CROC to be produced

Number of CROC (v3) :

Crate	Croc
ECAL	14 = 2x7
HCAL	4 = 2x2
PRS	8 = 2x4
Spare	26
Total	33

• Vérifier liste des signaux TTCrq. Voir emprunt TTCvx (Atlas) au LAL

Output MCM on CROCv3 board

FEB	FE_PGA on CROC	Chanel_MCM Optical Transmitter
FEB_0
FEB_1
FEB_2
FEB_3
FEB_4

Compte-Rendus

• Compte-Rendu Meeting 23 Nov. 05 : CROC fabrication test