Watchdog Timer (WDT)

Dolphin Technology provides Watchdog Timer (WDT) IP which is used to prevent system lockup if software becomes trapped in a deadlock by generating a system reset, an interrupt, or an external signal. The IP is programmable by a standard APB Slave peripheral which is used periodically by Software to control the watchdog by writing to it to reset its timeout counters.

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Features Design Status
Compliant with the following specifications:

  • AMBA, Advanced Peripheral Bus (APB) Specification Version 2.0
  • AMBA, Advanced High-performance Bus (AHB) Specification Version 2.0
  • AMBA, Advanced eXtensibale Bus (AXI) Specification Version 4.0
  • AMBA, Advanced eXtensibale Lite Bus (AXI-Lite) Specification Version 4.0

DTI WDT Controller supports:

  • 32 bit APB bus width.
  • WDT can perform two types of operations when timeout occurs:
    • Generate a system reset.
    • First generate an interrupt and even if it is cleared (or not cleared) by the service routine by the time a second timeout occurs then generate a system reset.
  • Pause mode for debugging
  • Programmable reset pulse length
  • Prevention of accidental restart of the watchdog counter
  • Prevention of accidental disabling of the watchdog counter
  • 32 bits WDT counter width
  • Counter counts down from a preset value to 0 to indicate the occurrence of a timeout
  • Optional external clock signal to control the rate at which the counter counts
  • Optional support for asynchronous external timer clock. With this feature enabled, the timer interrupt and system reset can be generated, even when the APB bus clock is switched off
  • Software interface consistent with AMBA Advanced Peripheral Bus (APB), Advanced High-performance bus (AHB) or Advanced eXtensible Interface (AXI)

Data Sheets are available under NDA



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