SPI Clock & Timing Margin Checker
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From slave setup/hold times and round-trip delay, check whether the current SCLK still keeps timing margin and derive the highest usable clock.
Key points
SPI Clock & Timing Margin Checker: From slave setup/hold times and round-trip delay, check whether the current SCLK still keeps timing margin and derive the highest usable clock. Formula: T_SCLK ≥ t_SU + t_H + t_PD (round trip). Enter parameters on the DD-CAT IDE online tool page to get results instantly, with a calculation-model diagram that updates with the inputs. SPI has no acknowledgement; insufficient margin shows up as an occasional wrong bit, first at high temperature or low supply.
Inputs
T_SCLK ≥ t_SU + t_H + t_PD (round trip)Calculation model (updates with parameters)
| SCLK period | 100.00 ns | |
| Minimum half period | 48.00 ns | Duty distortion already deducted |
| Setup margin | 39.00 ns | |
| Hold margin | 41.00 ns | |
| Theoretical max SCLK | 45.45 MHz | Estimated over two half periods, duty distortion included |
| Recommended production frequency | 36.36 MHz | 20% margin included |
Engineering notes
- SPI has no acknowledgement; insufficient margin shows up as an occasional wrong bit, first at high temperature or low supply.
FAQ
- What is SPI Clock & Timing Margin Checker for?
- From slave setup/hold times and round-trip delay, check whether the current SCLK still keeps timing margin and derive the highest usable clock.
- What is the formula for SPI Clock & Timing Margin Checker?
- Core formula: T_SCLK ≥ t_SU + t_H + t_PD (round trip). The tool returns results instantly using this formula and the selected parameters.
- What engineering notes should I keep in mind when using SPI Clock & Timing Margin Checker?
- SPI has no acknowledgement; insufficient margin shows up as an occasional wrong bit, first at high temperature or low supply.