Embedded Peripherals IP User Guide

ID 683130
Date 10/18/2021
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A newer version of this document is available.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) 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

44.2.2. Operation— Avalon® -ST Bytes to Packets Converter Core

The Avalon® -ST Bytes to Packets Converter core receives streams of bytes and transforms them into packets. When parsing incoming bytestreams, the core decodes special characters in the following manner, with higher priority operations listed first:
  • Escape (0x7d)—The core drops the byte. The next byte is XOR'ed with 0x20.
  • Start of packet (0x7a)—The core drops the byte and marks the next payload byte as the start of a packet by asserting the startofpacket signal on the Avalon® -ST source interface.
  • End of packet (0x7b)—The core drops the byte and marks the following byte as the end of a packet by asserting the endofpacket signal on the Avalon® -ST source interface. For single beat packets, both the startofpacket and endofpacket signals are asserted in the same clock cycle.

    There are two possible cases if the payload is a special character:

    • The byte sent after end of packet is ESC'ed and XOR'ed with 0x20.
    • The byte sent after end of packet is assumed to be the last byte regardless of whether or not it is a special character.
    Note: The escape character should be used after an end of packet if the next character requires it.
  • Channel number indicator (0x7c)—The core drops the byte and takes the next non-special character as the channel number.
Figure 134. Examples of Bytestreams