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

22.2.4. Avalon® -ST Sink to Avalon® -MM Read Agent

In this configuration seen in the figure below, the input is an Avalon® -ST sink and the output is an Avalon® -MM read agent with a width of 32 bits. The Avalon® -ST input (sink) data width must also be 32 bits. You can configure input interface parameters, including: bits per symbol, symbols per beat, and the width of the channel and error signals. The FIFO core performs the endian conversion to conform to the output interface protocol.

An Avalon® -MM host reads the data from the FIFO core. The signals are mapped into bits in the Avalon® address space. If Allow backpressure is turned on, the input (sink) interface uses the ready and valid signals to indicate when space is available in the FIFO core and when valid data is available. For the output interface, waitrequest is asserted for read operations when there is no data to be read from the FIFO core. It is deasserted when the FIFO core has data to send. The memory map for this configuration is exactly the same as for the Avalon® -MM to Avalon® -ST FIFO core. See the for Memory Map table for more information.

Figure 76. FIFO with Avalon® -ST Input and Avalon® -MM Output

If Enable packet data is turned off, read data repeatedly at address offset 0 to pop the data from the FIFO core.

If Enable packet data is turned on, the Avalon® -MM read host starts reading from address offset 0. If the read is valid, that is, the FIFO core is not empty, both data and packet status information are popped from the FIFO core. The packet status information is obtained by reading at address offset 1. Reading from address offset 1 does not pop data from the FIFO core. The ERROR, CHANNEL, SOP, EOP and EMPTY fields are available at address offset 1 to determine the status of the packet data read from address offset 0.

The EMPTY field indicates the number of empty symbols in the data field. For example, if the Avalon® -ST interface has symbols-per-beat of 4, and the last packet data only has 1 symbol, the empty field is 3 to indicate that 3 symbols (the 3 least significant symbols in the memory map) are empty.