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

28.11.11. alt_msgdma_construct_extended_mm_to_mm_descriptor

Table 381.  alt_msgdma_construct_extended_mm_to_mm_descriptor
Prototype: int alt_msgdma_construct_extended_mm_to_mm_descriptor (alt_msgdma_dev *dev, alt_msgdma_extended_descriptor *descriptor, alt_u32 *read_address, alt_u32 *write_address, alt_u32 length, alt_u32 control, alt_u16 sequence_number, alt_u8 read_burst_count, alt_u8 write_burst_count, alt_u16 read_stride, alt_u16 write_stride)
Include: < modular_sgdma_dispatcher.h >
Parameters:

*dev-a pointer to msgdma instance.

*descriptor – a pointer to an extended descriptor structure.

*read_address – a pointer to the base address of the source memory.

*write_address – a pointer to the base address of the destination memory.

length – is used to specify the number of bytes to transfer per descriptor. The largest possible value can be filled in is “0Xffffffff”.

control – control field.

sequence_number – programmable sequence number to identify which descriptor has been sent to the host block.

read_burst_count – programmable burst count between 1 and 128 and a power of 2. Setting to 0 will cause the host to use the maximum burst count instead.

write_burst_count – programmable burst count between 1 and 128 and a power of 2. Setting to 0 will cause the host to use the maximum burst count instead.

read_stride – programmable transfer stride. The stride value determines by how many words the host will increment the address. For fixed addresses the stride value is 0, sequential it is 1, every other word it is 2, etc…

write_stride – programmable transfer stride. The stride value determines by how many words the host will increment the address. For fixed addresses the stride value is 0, sequential it is 1, every other word it is 2, etc…

Returns:

“0” for success, -EINVAL for invalid argument, could be due to argument which has larger value than hardware setting value.

Description:

Function call helper function “alt_msgdma_construct_extended_descriptor” for constructing mm_to_mm extended descriptors. Unnecessary elements are set to 0 for completeness and will be ignored by the hardware.