PCB Review Notes 20-01-2012
Assistants: Erik van der Bij, Matthieu Cattin, Tomasz Wlostowski, Carlos Gil Soriano.
Schematics
- All ICs must have the inputs in a known state: IC2b IC10c, IC11E/F.
Check others.
- DONE: now every IC has known inputs.
- Unused inputs should be directly connected to GND or power.
- DONE: now every IC has known inputs.
- Some pins are connected to GND or Power through pulls
- DONE: in IC1A, IC1B inputs
- REJECTED: in IC1A, IC1B, IC2A outputs (antiglitch feature).
- Change 470K pullup resistor in TPS3808G01DBVT for something stronger
- REJECTED: in the datasheet they specify that the pullup shouldn't be less than 10K and in the circuit example they are using 1M. Not changed.
- Manual control over Blocking Power Source
- DONE: it doesn't need external pullup due to internal one in TPS3808G01DBVT
- Change 100 Ohm pull-ups for something less strong: IC3, IC1,...
- DONE
- 50 Ohm input termination must be mounted in front board, not in rear
board.
- DONE
- Ground IN- of FOD060L.
- DONE
- Change FOD060L from another pin-to-pin compatible.
- DONE: changed to HCPL-0601
- J12 should be changed for a header. Nets should directly connect
with FPGA.
- DONE
- Add glitch-free controll from FPGA to MR_N pin of Blocking PS
enable IC.
- DONE
- Add inverted to the output of TPS3808G01DBVT to connect it to TPS40210DGQ
- Recheck antiglitch
Layout
- P3V3_VME more poly on Top Layer.
- Missmatching in names.
- Remove CERN logo.
- Add project URL + license.
- P5V_VME and VME P2_5V not used: to remove.
- Silk for J12
- Gather all clocking together
- Possibly rotate 24V and do bigger some power net (1V2,MGBT) thanks to the two power planes.
- FPGA_MGTAVCC to L4PWR. Put at least 5x100nF to MGTAVCC
- Move inside MGBT capacitors.
- FPGA_CLK can be pin swapped.
- Test point should not be mounted by default.
- Add extra GND test points all around the board.
- BLO_24V can be bigger under the converter
- SFP rx/tx can be routed on top layer.
- Silkscreen for switches.
- Remove copper islands.
- IMPORTANT: remove plugged in holes.