Embedded Peripherals IP User Guide

ID 683130
Date 3/28/2022
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents
1. Introduction 2. Avalon® -ST Multi-Channel Shared Memory FIFO Core 3. Avalon® -ST Single-Clock and Dual-Clock FIFO Cores 4. Avalon® -ST Serial Peripheral Interface Core 5. SPI Core 6. SPI Agent/JTAG to Avalon® Host Bridge Cores 7. Intel eSPI Agent Core 8. eSPI to LPC Bridge Core 9. Ethernet MDIO Core 10. Intel FPGA 16550 Compatible UART Core 11. UART Core 12. JTAG UART Core 13. Intel FPGA Avalon® Mailbox Core 14. Intel FPGA Avalon® Mutex Core 15. Intel FPGA Avalon® I2C (Host) Core 16. Intel FPGA I2C Agent to Avalon® -MM Host Bridge Core 17. Intel FPGA Avalon® Compact Flash Core 18. EPCS/EPCQA Serial Flash Controller Core 19. Intel FPGA Serial Flash Controller Core 20. Intel FPGA Serial Flash Controller II Core 21. Intel FPGA Generic QUAD SPI Controller Core 22. Intel FPGA Generic QUAD SPI Controller II Core 23. Interval Timer Core 24. Intel FPGA Avalon FIFO Memory Core 25. On-Chip Memory (RAM and ROM) Intel FPGA IP 26. On-Chip Memory II (RAM or ROM) Intel FPGA IP 27. Optrex 16207 LCD Controller Core 28. PIO Core 29. PLL Cores 30. DMA Controller Core 31. Modular Scatter-Gather DMA Core 32. Scatter-Gather DMA Controller Core 33. SDRAM Controller Core 34. Tri-State SDRAM Core 35. Video Sync Generator and Pixel Converter Cores 36. Intel FPGA Interrupt Latency Counter Core 37. Performance Counter Unit Core 38. Vectored Interrupt Controller Core 39. Avalon® -ST Data Pattern Generator and Checker Cores 40. Avalon® -ST Test Pattern Generator and Checker Cores 41. System ID Peripheral Core 42. Avalon® Packets to Transactions Converter Core 43. Avalon® -ST Multiplexer and Demultiplexer Cores 44. Avalon® -ST Bytes to Packets and Packets to Bytes Converter Cores 45. Avalon® -ST Delay Core 46. Avalon® -ST Round Robin Scheduler Core 47. Avalon® -ST Splitter Core 48. Avalon® -MM DDR Memory Half Rate Bridge Core 49. Intel FPGA GMII to RGMII Converter Core 50. Intel FPGA MII to RMII Converter Core 51. Intel FPGA HPS GMII to TSE 1000BASE-X/SGMII PCS Bridge Core 52. Intel FPGA HPS EMAC to Multi-rate PHY GMII Adapter Core 53. Intel FPGA MSI to GIC Generator Core 54. Cache Coherency Translator Intel® FPGA IP

23.4.1. HAL System Library Support

The Intel-provided drivers integrate into the HAL system library for Nios® II and Nios® V processors systems. When possible, HAL users should access the core via the HAL API, rather than accessing the core's registers directly.

Intel provides a driver for both the HAL timer device models: system clock timer, and timestamp timer.

System Clock Driver

When configured as the system clock, the interval timer core runs continuously in periodic mode, using the default period set. The system clock services are then run as a part of the interrupt service routine for this timer. The driver is interrupt-driven, and therefore must have its interrupt signal connected in the system hardware.

The Nios® II integrated development environment (IDE) allows you to specify system library properties that determine which timer device will be used as the system clock timer.

Timestamp Driver

The interval timer core may be used as a timestamp device if it meets the following conditions:

  • The timer has a writeable period register, as configured in Platform Designer.
  • The timer is not selected as the system clock.

    The Nios® II IDE allows you to specify system library properties that determine which timer device will be used as the timestamp timer.

    If the timer hardware is not configured with writeable period registers, calls to the alt_timestamp_start() API function will not reset the timestamp counter. All other HAL API calls will perform as expected.

    For more information about using the system clock and timestamp features that use these drivers, refer to the Nios® II Software Developer’s Handbook. The Nios® II Embedded Design Suite (EDS) also provides several example designs that use the interval timer core.

Limitations

The HAL driver for the interval timer core does not support the watchdog reset feature of the core.