Embedded Peripherals IP User Guide

ID 683130
Date 12/13/2021
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) 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

30.3.1. DMA Parameters (Basic)

The DMA Parameters page includes the following parameters.

Transfer Size

The parameter Width of the DMA Length Register specifies the minimum width of the DMA’s transaction length register, which can be between 1 and 32. The length register determines the maximum number of transfers possible in a single DMA transaction.

By default, the length register is wide enough to span any of the agent peripherals hosted by the read or write ports. Overriding the length register may be necessary if the DMA host port (read or write) hosts only data peripherals, such as a UART. In this case, the address span of each agent is small, but a larger number of transfers may be desired per DMA transaction. A smaller transfer width usually results in a faster FPGA frequency for the DMA Controller Core.

Burst Transactions

When Enable Burst Transfers is turned on, the DMA controller performs burst transactions on its host read and write ports. The parameter Maximum Burst Size determines the maximum burst size allowed in a transaction.

In burst mode, the length of a transaction must not be longer than the configured maximum burst size. Otherwise, the transaction must be performed as multiple transactions.

FIFO Depth

The parameter Data Transfer FIFO Depth specifies the depth of the FIFO buffer used for data transfers. Intel recommends that you set the depth of the FIFO buffer to at least twice the maximum read latency of the agent interface connected to the read host port. A depth that is too low reduces transfer throughput.

FIFO Implementation

This option determines the implementation of the FIFO buffer between the host read and write ports. Select Construct FIFO from Registers to implement the FIFO using one register per storage bit. This option has a strong impact on logic utilization when the DMA controller’s data width is large. See the Advanced Options section.

By default, the FIFO implementation uses the embedded memory blocks.