Project description
This project aims at distributing periodic (mainly clock) signals of arbitrary frequencies over a White Rabbit network. A clock is encoded at a master node and unidirectionally broadcast to any number of receiver nodes, which recover an in-phase copy of the original signal. Number of distributed clocks depends only on network bandwidth, required latency and acceptable accuracy level.
Possible applications in the accelerators are:
- Beam-synchronous timing
- RF clock distribution
- RF or beam-synchronous signal acquisition
Requirements
Note*: this is just a preliminary specification for the proof-of-concept demo project, it may be modified.
- Frequency range: 0 - 250 MHz (to be able to distribute 40.079 MHz LHC bunch crossing frequency and 200 MHz SPS RF clocks)
- System must accept clocks with abrupt frequency changes (i.e. FSK modulation), such as the SPS-RF-clock-for-ions.
- Required jitter: < 10 ps rms (10 Hz - 10 MHz). More jitter allowed for rapidly changing input clocks (e.g. SPS Ions).
- Accuracy: < 1ns
- Precision: < 100 ps
- Hardware platform: FMC DDS on a SPEC carrier or SVEC carrier
Project repositories:
- Hardware (schematics/PCB design): FMC DDS Mezzanine project
- Gateware (VHDL) is currently hosted in the Mock Turtle (a.k.a. WR
Node Core) HDL repository:
* VHDL DDS Core
* Top level for the SPEC carrier
* Top level for the SVEC carrier - Embedded software
© is currently hosted in the Mock Turtle (a.k.a. WR Node Core) software repository
Please keep in mind that the Git repo linked to this project contains a 2013 demo firmware & software that will be no longer developed.*
Contacts
Commercial producers
General questions about project
- Tomasz Włostowski - CERN
Status
Date | Event |
01-04-2013 | Project started. |
03-04-2013 | Specification ready. |
10-04-2013 | V0 schematics created & reviewed. |
15-04-2013 | FMC hardware order sent to company. |
20-04-2013 | Started VHDL/software development. |
24-04-2013 | Received & powered up 2 DDS mezzanines. |
08-05-2013 | First working demo design. |
15-05-2013 | 2013 Demo presented on PH-ESE seminar. |
20-10-2015 | Mock Turtle-based RF distribution system presented on ICALEPCS' 2015. |
01-12-2015 | Project specification extended to include SPS ion RF clock. |
20-01-2016 | Successful simulation of distributing SPS ion RF clock using undersampling ADC. |
Tomasz Wlostowski - 21 January 2016