The Adjustable Clock from NetTimeLogic is an adjustable counter clock with nanosecond resolution (second and nanosecond format). It is used by all other cores from NetTimeLogic but can also be used as standalone core. It contains a hardware implemented PI servo loop (which also can be bypassed) for smooth adjustment of drift and offset. Drift and Offset correction are adjusted in parallel and individual. It can take any input frequency, even with non-integer clock periods (e.g. 66MHz) which is handled with fractional subcounters. It has multiple adjustment inputs which are multiplexed to define the source of synchronization.
All calculations and corrections are implemented completely in HW.
The IP core comes with a Linux Driver
Adjustable Counter Clock core
Overview
Key Features
- 32 bit second and 32 bit nanosecond counter clock with fractional extention
- 1 millisecond pulse generator aligned with the counter clock
- Allows non-integer clock periods
- Multiplexing of multiple adjustment inputs
- AXI4 Light register set or static configuration
- Evenly spread offset and drift correction (offset might be set hard in case of large offsets)
- Hard setting of time possible
- Individual hardware only PI servo loops for offset and drift correction (PI parameters individually configurable)
- Runtime changeable PI servo parameters
- Offset correction: min 1 ns / s, max 0.5 s/s
- Drift correction: min 1 ns / s, max 0.05 s/s
- Conversion of fractional adjustments into even spread clock adjustments
- Provides time for all other cores
- Logging of correction values
- Linux Driver (PHC)
Benefits
- Coprocessor handling adjustments of frequency and phase completely standalone in the core.
- No Software Stack required
Block Diagram
Applications
- Distributed data acquisition
- Ethernet based automation networks
- Automation
- Robotic
- Automotive
- Test and measurement
Deliverables
- Source Code (not encrypted, not obfuscated)
- Reference Designs
- Testbench with Stimulifiles
- Configuration Tool
- Linux Driver
- Documentation
Technical Specifications
Availability
Now