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

31.2.1. Avalon® -MM Compliant CSR Registers

Each ILC has rows of status registers each being 32 bits in length. The last five rows of CSR registers corresponding to address 0x20 to 0x24 are fixed regardless of the number of IRQ port count configured through the Platform Designer GUI. The Address 0x0 to 0x1F is reserved to store the latency value which depends on the number of IRQ port configured. For example, if you configure the instance to have only five counters, then only addressess 0x0 to 0x4 return a valid value when you try to read from it. When the IP user tries to read from an invalid address, the IP returns binary ‘0’ value.

Table 477.  ILC Register Mapping
Word Address Offset Register/ Queue Name Attribute
0x0 IRQ_0 Latency Data Registers Read access only
0x1 IRQ_1 Latency Data Registers Read access only
... ... ...
0x1F IRQ_31 Latency Data Registers Read access only
0x20 Control Registers Read and Write access on LSB and Read only for the remaining bits
0x21 Frequency Registers Read access only
0x22 Counter Stop Registers Read and Write access
0x23 Read data Valid Registers Read access only
0x24 IRQ Active Registers Read access only