AR# 50826

描述

This example design allocates 4K of block RAM attached to the CPU via M_AXI_GP0. The same block RAM is also accessible by the CDMA. 

The CPU initializes the block RAM. The CDMA in simple mode is transferring data from the block RAM to the OCM via ACP port. The transfer is cache coherent and when the transfer is complete, the CPU sees the updated OCM without invalidating or flushing the cache.

Note: An Example Design is an answer record that provides technical tips to test a specific functionality on Zynq-7000. A tip can be a snippet of code, a snapshot, a diagram or a full design implemented with a specific version of the Xilinx tools. It is up to the user to "update" these tips to future Xilinx tools releases and to "modify" the Example Design to fulfil their needs. Limited support is provided by Xilinx on these Example Designs.

解决方案

Please see the table below:

Implementation Details
Design Type	PS and PL
SW Type	Standalone
CPUs	Single CPU @ 667MHz
PS Features	MMU, OCM
PL Cores	BRAM, CDMA
Boards/Tools	ZC702
Xilinx Tools Version	Vivado 2015.1
Other details	FCLK @ 50MHz
Address Map
Files Provided
cdma_acp_design.zip	Archived Vivado project.
hello_axi_cdma.c	Snippet of code.
Block Diagram

Step-by-Step Instructions

1. Extract and open archived Vivado design, generate bitstream, export hardware with bitstream and launch SDK.
2. In SDK, create an Empty Application example.
3. Import the included snippet of C code.
4. Program the PL using the BITSTREAM generated by XPS.
5. Run the application.
   

Important Notes

1. The HIGH OCM must be accessible through the ACP port.
   In the .MHS, the processing_system7 has the following:
   PARAMETER C_S_AXI_ACP_ENABLE_HIGHOCM = 1.
2. The MMU table has the HIGH OCM shareable:
   
   

          /* S=b1 TEX=b100 AP=b11, Domain=b0, C=b1, B=b1 */
          Xil_SetTlbAttributes(0xFFF00000,0x10C06);

Expected Results

On the Terminal, at the end of the test, the destination memory should match the source memory.

The CPU can see the data transferred by the CDMA without any particular software implemented.

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