MICROCHIP Video DMA IP Chip User Guide

In the video applications space, it is required to write a continuous stream of incoming data (frames) from sources such as a video camera to memory. Video Direct Memory Access (VDMA) IP attempts to address the need for writing a continuous burst of data to DDR memory.

There are control registers that need to be configured within the IP. These registers are configured through AXI4 Lite interface.

The following figure shows the VDMA input and output ports.

Figure 1. VDMA Input Output Ports

Summary

The following table provides a summary of the Video DMA IP characteristics.

Table 1. Video DMA IP Characteristics

Features

The Video DMA IP has the following key features:

32-bit addressing for the AXI4 Lite Interface
38-bit addressing for the AXI4 Interface to DDR

Configurable Input Data Bus Width to 8-bit, 16-bit, and 32-bit
Fixed Output Data Bus Width of 64-bit

Supports Interrupt generation
32-bit Programmable Buffer Address to write the frames to DDR

Supports Multiple Resolution (example: 640 × 360, 1280 × 720, 1920 × 1080)
Frame Size for every written frame Available

Installation Instructions

The IP core must be installed to the IP Catalog of Libero® SoC software automatically through the IP Catalog update function in Libero SoC software, or it is manually downloaded from the catalog. Once the IP core is installed in Libero SoC software IP Catalog, it is configured, generated, and instantiated within SmartDesign for inclusion in the Libero project

Description (Ask a Question)

A video source generates a continuous stream of data which needs to be written to the DDR memory as video frames. The memory location for the frame buffers is configured through the control registers. For each processed frame, VDMA presents the frame size in the corresponding control register.

DDR memory requires 38-bit addressing. The processor provides for the 32-bit address to which the video frame has to be written. The VDMA appends all 0s to the lower 6 bits of the required 38-bit address, that is, 38-bit address = “MSB 32-bit address provided by the processor” + “LSB 6 bits are 0”. Multiple buffer addresses are provided and stored in VDMA. Maximum number of pending buffer addresses within VDMA is 32, at any given instance.

The DDR memory write agent is responsible to collect the video data from camera and write these as frame data to the DDR memory. It uses AXI4 interface to access the DDR memory. VDMA has internal buffers which store the incoming data before writing it to DDR through the AXI4 interface. The global interrupt register needs to be set to use the interrupt feature of the VDMA IP. When enabled, the required interrupts are enabled as seen from the control register map. For all the enabled interrupts, processor receives interrupt onto a single line. For example, when the end of frame interrupt is enabled, for every frame written to the DDR memory an interrupt is generated. This interrupt line to the processor is held high till the processor clears it through the interrupt status control register. Hence, the processor is notified whenever the frame is available for processing. An event may take place wherein, while the processor is clearing the interrupt, another interrupt event occurs. In such scenarios, VDMA IP raises the interrupt line high immediately after the processor clears the first interrupt. The processor identifies the source of the interrupt from the interrupt status control register. The same register is used to clear the interrupt as well.

The following figure shows the DMA architecture block diagram.

Figure 1-1. DMA Architecture Block Diagram

Configuration Settings (Ask a Question)

User can select 8, 16, and 32-bit Input Data Width for the Video DMA IP.

Inputs and Output Signals (Ask a Question)

The following table lists the Video DMA IP input and output signals.

Table 3-1. Input and Output Signal Description

Signal name	Direction	Width	Description
ACLK_I	Input	1	AXI4 Lite interface clock
ARESETN_I	Input	1	AXI4 Lite interface reset signal
DDR_CLK_I	Input	1	DDR clock for writing
DDR_CLK_RSTN_I	Input	1	DDR clock reset signal
VIDEO_SOURCE_CLK_I	Input	1	Video clock for data input
VIDEO_SOURCE_CLK_RSTN_I	Input	1	Video clock reset signal
DDR_CTRL_READY_I	Input	1	DDR controller ready signal to indicate that DDR memory is ready to accept commands from the VDMA IP
FRAME_START_I	Input	1	Indicates a start of frame for the camera data input
DATA_VALID_I	Input	1	Indicates that a valid data is available on the data bus
DATA_I	Input	8, 16, and 32	Camera data which has to be written to DDR memory
AXI4L_VDMA	Input	AXI4 Lite interface	AXI4 Lite interface to access control registers of the VDMA IP
INT_DMA_O	Output	1	This signal is held high till an interrupt clear signal is received. It will be generated for every frame data written to the DDR memory.
mAXI4_SLAVE	Output	AXI4 interface	This mirrored AXI4 slave interface is connected to the DDR memory for the frames to be written

Design Specifications (Ask a Question)

The following table lists the design specifications of the VDMA IP.

Table 4-1. Design Specification and Parameter

Sr num	Design parameter	Value
1	Buffer address FIFO	WIDTH: 32 DEPTH: 32
2	Frame size FIFO	WIDTH: 32 DEPTH: 32

Register Summary and Maps (Ask a Question)

Offset	Name	Bit Pos	7	6	5c	4	3	2	1	0
0x00	IP_VER	7:0	IP VERSION[7:0]
		15:8	IP VERSION[15:8]
		23:16	IP VERSION[23:16]
		31:24
0x04	Control_Register	7:0						FIFO RESET	IP RESET	ENABLE/ DISABLE
		15:8
		23:16
		31:24
0x08	GLBL_INT_EN	7:0				FRAME SIZE FIFO EMPTY	FRAME SIZE FIFO FUL	BUFFER ADDRESS FIFO EMPTY	BUFFER ADDRESS FIFO FULL	END OF FRAME INTERRUPT
		15:8
		23:16
		31:24
0x10	Interrupt_Enab e	7:0				FRAME SIZE FIFO EMPTY	FRAME SIZE FIFO FULL	BUFFER ADDRESS FIFO EMPT	BUFFER ADDRESS FIFO FULL	END OF FRAME INTERRUPT
		15:8
		23:16
		31:24
0x14 … 0x1B	Reserved
0x1C	Buffer_Address_FIF O	7:0	BUFFER ADDRESS FIFO[7:0]
		15:8	BUFFER ADDRESS FIFO[15:8]
		23:16	BUFFER ADDRESS FIFO[23:16]
		31:24	BUFFER ADDRESS FIFO[31:24]
0x20 … 0x23	Reserved
0x24	Frame_Size_FIFO	7:0	FRAME SIZE FIFO[7:0]
		15:8	FRAME SIZE FIFO[15:8]
		23:16	FRAME SIZE FIFO[23:16]
		31:24	FRAME SIZE FIFO[31:24]

IP Version (Ask a Question)

Name: IP_VER
Offset: 0x000
Reset: 0x10100
Property: Read-only

Current Video DMA IP version number

Bits 23:0 – IP VERSION[23:0] Current Video DMA IP version number

Control Register (Ask a Question)

Name: Control_Register
Offset: 0x004
Reset: 0x1
Property: Read/Write

Bit 2 – FIFO RESET Writing a value of ‘1’ flushes all the FIFOs within the Video DMA IP core. It does not hold the written value, that is, writes are combinatorial in nature

Bit 1 – IP RESET Writing a value of ‘1’ resets the IP core and flushes all the FIFOs within the Video DMA IP core. It does not hold the written value, that is, writes are combinatorial in nature.

Bit 0 – ENABLE/DISABLE This setting manages the activation and deactivation of the IP. Setting it to ‘1’ will enable the IP, while setting it to ‘0’ will disable it.

Enable Global Interrupt (Ask a Question)

Name: GLBL_INT_EN
Offset: 0x008
Reset: 0x0
Property: Read/Write

Global Interrupt Enable

Bit 0 – GLOBAL INTERRUPT ENABLE Enables the interrupts globally at Video DMA IP level.

Interrupt Status (Ask a Question)

Name: Interrupt_Status
Offset: 0x00C
Reset: 0x0
Property: Read/Write

Interrupt Status Register

Bit 4 – FRAME SIZE FIFO EMPTY When enabled, it indicates to the processor that the frame size FIFO is getting empty. Writing a value of ‘1’ will clear this interrupt.

Bit 3 – FRAME SIZE FIFO FULL When enabled, it indicates to the processor that the frame size FIFO is in full condition. Writing a value of ‘1’ will clear this interrupt.

Bit 2 – BUFFER ADDRESS FIFO EMPTY When enabled, buffer address FIFO empty interrupt will be generated, when the Video DMA IP has processed all the buffer addresses provided by the processor. Writing a value of ‘1’ will clear this interrupt.

Bit 1 – BUFFER ADDRESS FIFO FULL When enabled, buffer address FIFO full interrupt will be generated when the Video DMA IP is unable to accept any more buffer addresses from the processor, indicating that the FIFO is in full condition. Writing a value of ‘1’ will clear this interrupt.

Bit 0 – END OF FRAME INTERRUPT When enabled, End Of Frame interrupt is generated after every frame is written to the memory. This frame is written to the buffer address provided by the processor. Reading a value of ‘1’ in this register indicates that the Frame End interrupt event has occurred. Writing a value of ‘0’ clears the interrupt.

Enable Interrupt (Ask a Question)

Name: Interrupt_Enable
Offset: 0x010
Reset: 0x0
Property: Read/Write

Interrupt Enable Register

Bit 4 – FRAME SIZE FIFO EMPTY Writing a value of ‘1’ enables the interrupt generation for frame size FIFO empty condition.

Bit 3 – FRAME SIZE FIFO FULL Writing a value of ‘1’ enables the interrupt generation for frame size FIFO full condition.

Bit 2 – BUFFER ADDRESS FIFO EMPTY Writing a value of ‘1’ enables the interrupt generation for buffer address FIFO empty condition.

Bit 1 – BUFFER ADDRESS FIFO FULL Writing a value of ‘1’ enables the interrupt generation for buffer address FIFO full condition.

Bit 0 – END OF FRAME INTERRUPT Writing a value of ‘1’ enables the Frame End interrupt. The interrupt will be generated for every frame getting written to the memory.

FIFO Buffer Address (Ask a Question)

Name: Buffer_Address_FIFO
Offset: 0x01C
Reset: 0x0
Property: Write-only

Buffer address provided by the external agent, like processor, should be written to this address register.

Bits 31:0 – BUFFER ADDRESS FIFO[31:0] The buffer address, to which the frame should be written, is programmed by the external agency into this control register. The provided 32-bit address is internally converted to 38-bit address, as shown below. This 38-bit address is used by the FIC interface to access the DDR memory, by the MSS processor.

Value	Description
MSS 37:6 address	32-bit address programmed into the buffer address FIFO
MSS 5:0 address	Lower 6 bits are hard coded to the value of 0

FIFO Frame Size (Ask a Question)

Name: Frame_Size_FIFO
Offset: 0x024
Reset: 0x0
Property: Read-only

Size of the frame which was written to the DDR memory

Bits 31:0 – FRAME SIZE FIFO[31:0] Frame size, which is written to the DDR memory, can be read from this control register. This register should be read after receiving the End Of Frame interrupt, which indicates a valid memory write operation.

Testbench Simulation (Ask a Question)

A sample testbench is provided to simulate the VDMA IP core. To simulate the testbench, perform the following steps:

In Libero SoC tool, click View > Windows > IP Catalog and search for VDMA entry.

To configure the IP, double-click VDMA and click OK.
Navigate to Stimulus Hierarchy and click Build Hierarchy, as shown in the following figure.
Figure 6-1. Stimulus Hierarchy
To run the testbench in interactive mode, navigate to the Stimulus Hierarchy tab, right-click vdma_tb > Simulate Pre-Synth Design > Open Interactively. The IP gets simulated for a single frame with 320 × 240 resolution, as shown in the following figure.
Figure 6-2. Pre-Synth Design Simulation

The testbench runs and the simulator waveforms are added to view the data transfer from the video source to the VDMA IP, as shown in the following figures.

Figure 6-3. Testbench Transcript

Figure 6-4. Model Sim Tool Window

Important: If the simulation is interrupted due to the runtime limit specified in the .do file, use the run-all command to complete the simulation.

Resource Utilization (Ask a Question)

The following table lists the resource utilization of VDMA IP design made for PolarFire® SoC.

Family	Device	Fabric 4LUT	Fabric DFF	Interface 4LUT	Interface DFF	uSRAM	LSRAM	Chip Global
PolarFire® SoC	MPFS250TS	1052	1093	624	321	1	17	3

Revision History (Ask a Question)

The revision history describes the changes that were implemented in the document. The changes are listed by revision, starting with the most current publication.

Table 8-1. Revision History

Revision	Date	Description
B	05/2024	Added Register Maps, see: 5. Register Summary and Maps.
A	02/2024	Initial Release

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Documents / Resources

MICROCHIP Video DMA IP Chip [pdf] User Guide
DS50003651B, Video DMA IP Chip, DMA IP Chip, IP Chip, Chip

References

User Manual

Introduction (Ask a Question)