Embedded Peripherals IP User Guide

ID 683130
Date 10/24/2025
Public
Document Table of Contents
1. Introduction 2. Avalon® -ST Serial Peripheral Interface Core 3. SPI Core 4. SPI Agent/JTAG to Avalon® Host Bridge Cores 5. Intel eSPI Agent Core 6. eSPI to LPC Bridge Core 7. Ethernet MDIO Core 8. Intel FPGA 16550 Compatible UART Core 9. UART Core 10. Lightweight UART Core 11. JTAG UART Core 12. Intel FPGA Avalon® Mailbox Core 13. Intel FPGA Avalon® Mutex Core 14. Intel FPGA Avalon® I2C (Host) Core 15. Intel FPGA I2C Agent to Avalon® -MM Host Bridge Core 16. EPCS/EPCQA Serial Flash Controller Core 17. Intel FPGA Serial Flash Controller Core 18. Intel FPGA Serial Flash Controller II Core 19. Intel FPGA Generic QUAD SPI Controller Core 20. Intel FPGA Generic QUAD SPI Controller II Core 21. Interval Timer Core 22. Intel FPGA Avalon FIFO Memory Core 23. On-Chip Memory (RAM and ROM) Intel FPGA IP 24. On-Chip Memory II (RAM or ROM) Intel FPGA IP 25. PIO Core 26. PLL Cores 27. DMA Controller Core 28. Modular Scatter-Gather DMA Core 29. Scatter-Gather DMA Controller Core 30. Video Sync Generator and Pixel Converter Cores 31. Intel FPGA Interrupt Latency Counter Core 32. Performance Counter Unit Core 33. Vectored Interrupt Controller Core 34. System ID Peripheral Core 35. Intel FPGA GMII to RGMII Converter Core 36. HPS GMII to RGMII Adapter IP 37. Intel FPGA MII to RMII Converter Core 38. HPS GMII to TSE 1000BASE-X/SGMII PCS Bridge Core IP 39. Intel FPGA HPS EMAC to Multi-rate PHY GMII Adapter Core 40. Intel FPGA MSI to GIC Generator Core 41. Cache Coherency Translator IP 42. Altera ACE5-Lite Cache Coherency Translator

21.3. IP Parameters

Figure 72. Interval Timer IP Parameters
Table 265.  Interval Timer IP Parameters
Name Type Default Range Description
Timeout Period
Period String 1 - The actual period depends on the frequency of the system clock associated with the timer.
Units String ms μs, ms, s, clocks Timeout Period setting can be specified in units of μs, ms, seconds, or clocks.
Timer counter size
Counter Size Integer 32 32,64 Determines the timer's width, which can be set to either 32 or 64 bits.
Registers
No Start/Stop control bits Boolean False True, False When this option is disabled, a host peripheral can start and stop the timer by writing the START and STOP bits in the control register. When enabled, the timer runs continuously. When the System reset on timeout (watchdog) option is enabled, the START bit is also present, regardless of the Start/Stop control bits option.
Fixed period Boolean False True, False When this option is disabled, a host peripheral can change the count-down period by writing to the period registers. When enabled, the count-down period is fixed at the specified Timeout Period, and the period registers do not exist in hardware.
Readable snapshot Boolean true True, False When this option is enabled, a master peripheral can read a snapshot of the current countdown. When disabled, the status of the counter is detectable only via other indicators, such as the status register or the IRQ signal.
Output signals
System reset on timeout (Watchdog) Boolean False True, False

When this option is on, the core’s Avalon® -MM agent port includes the resetrequest signal. This signal pulses high for one clock cycle whenever the timer reaches zero resulting in a system-wide reset. The internal timer is stopped at reset. Explicitly writing the START bit of the control register starts the timer.

When this option is off, the resetrequest signal does not exist.

Refer to the Chapter Configuring the Timer as a Watchdog Timer for information.

Watchdog Timer Pulse Length Integer 2 2–16 The number of clock cycles the resetrequest signal will pulse high. If the System reset on timeout option is disabled, this option is hidden.
Timeout pulse (1 clock wide) Boolean False True, False When this option is on, the core outputs a signal timeout_pulse. This signal pulses high for one clock cycle whenever the timer reaches zero. When this option is off, the timeout_pulse signal does not exist.