Embedded Peripherals IP User Guide

ID 683130
Date 10/18/2021
Public

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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) Core 26. On-Chip Memory II (RAM or ROM) 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

53.3. Feature Description

The Intel FPGA MSI-to-GIC Generator provides storage for the MSI system-specified data value. It also generates level interrupt output when there is an unread entry. The following figure illustrates the connection of the MSI-to-GIC Generator module in a PCIe subsystem.
Figure 157. MSI-to-GIC Generator in PCIe RP system

This module is connected to RP_Master of PCIe RootPort HIP issuing memory map write transaction upon MSI TLP arrival. System-specified data value carried by the MSI TLP is written into the module storage. The same Avalon® MM Data Agent port also connects to the host processor for MSI data retrieval upon interrupt assertion. An Intel FPGA MSI-to-GIC Generator module could contain data storage from one to 32 words of continuous address span. Each data word of storage is associated with a corresponding numbered bit of Status Bits and Mask Bits registers. Each data word address location can store up to 32 entries.

There is an up to 32-bit Status Register that indicates which storage word location has an unread entry. Also, there is a similar bit size of Interrupt Mask Register that is in place to allow control of module behavior by the host processor. The Interrupt Mask register provides flexibility for the host processor to disregard the incoming interrupt.

The base address assigned for Intel FPGA MSI-to-GIC Generator module in the subsystem should cover the system-specified message address of MSI capable functions during device configuration. Multiple Intel FPGA MSI-to-GIC Generator modules could be instantiated in a subsystem to cover different system-specified message addresses.

Avalon® -MM Agent interfaces of this module honors fixed latency of access to ensure the connected host (in this case, the RP_Master) can successfully write into the module without back pressure. This avoids the PCIe upstream traffic from impact because of backpressuring of RP_Master.

Since MSI is multiple messages capable and multiple vectors are supported by each MSI capable function, there is a tendency that a system-specified message address receives more than one MSI message data before the host processor is able to service the MSI request. The Component is configurable to have each data word address to receive up to 32 entries, before any data value is retrieved. When you reach the maximum data value entry of 32, subsequent write transactions are dropped and logged. This ensures every write transaction to the storage has no back pressure which may lead to system lock up.