Introduction:
The Optoboard System is the data aggregation and signal conversion stage of the ATLAS ITk Pixel data transmission chain. The basic working principle is:
- DATA: 6x 1.28 Gbps electrical links from the front-end modules are serialized into 1x 10.24 Gbps optical link and transmitted to the backend (FELIX).
- CMD: 1x 2.56 Gbps optical link with trigger and command are deserialized into 8x 160 Mbps electrical links and transmitted to the front-end (ITkPix). Also the Optoboard gets controlled through the optical link.
One Optoboard consists of:
- 4 lpGBTv1: one as a master available through IC, three as slaves controlled through I2C controller of the master. Manual/description here.
- 4 GBCR2: all controlled through lpGBT master I2C controller. Manual here.
- 1 VTRx+: controlled through lpGBT master I2C controller. Description here.
- 1 bPOL2V5 carrier board: houses the bPOL2V5 ASIC that converts 2.5 V to 1.2V. Datasheets here
Mechanics:
- Up to 8x Optoboards are housed in one Optobox. One Optobox consists also of:
- 1 Powerboard: hosts 5 bPOL12V ASICs (conversion 9 V to 2.5 V) and 1 MOPS chip
- 1 Connectorboard: handles power distribution form the 5 bPOL12V to the 8 Optoboards according the SP chain powering/detector layout.
- Up to 28x Optoboxes (14x normal, 14x mirrored) are housed in one Optopanel.
- Each side of the ITk has 4 Optopanels.
Currently specific for SLAC IS demonstrator:
4x Optoboards are housed in one Optobox. This Optobox is housed in a Test-Optopanel.
Interfaces:
Please refer to our Interface Document here. All the connectors of the Optoboard System is explained there.
Schematics:
All schematics for all of Berns designed PCBs can be found here.
Optoboard sytem support:
We collect support requests and general questions on our Mattermost channel Bern-Optoboard (invite link)