Nexys3 learning notes (3) - Add SRAM memory

For an embedded system, the memory is undoubtedly very important. There are 3 memory: SRAM, parallel Flash (non-volatile phase change memory), and serial Flash (non-volatile phase change memory). For the sake of simplicity, first learn how to add SRAM to the system. Nexys3 uses Micron's 128MBITS CELLUAR RAM MT45W8MW16BGX, which can be configured to synchronize and asynchronous modes, and specific reference device manuals, mainly cares about interfaces and time parameters. Or open the previously established system, discover NEXSY3, it automatically generates a custom IP core: MEM_BUS_MUX, which is mainly used as a memory of the address, data, and control signals. FPGA is connected to the memory signal connection Therefore, the main job is to add a memory control IP. Locate external memory to control IP - XPS Multi-Channel External Memory Controller under the IP Catalog bar. First set Note that the memory data width on Nexys3 is 16 bits, which is mainly the time parameters, which must be referred to the SRAM device manual, otherwise it may be accessed correctly. Access mode is set to asynchronous asynchronous Next, you will connect to the added IP core signal. Since only SRAM is added, it is only connected to the connection with the SRAM controller. Finally, set the address range of the SRAM, and the SRAM on Nexys3 has 16MB of space. It is still not completed, the SRAM is formulated as an asynchronous mode. From the circuit diagram, you can see that the FPGA to SRAM has some control signals yet, you need to add ports to the .mhs file. Compile generation stream files and import them into the EDK. Under the EDK software, select File->new->xilinx C Project, select the Memory TEST that comes with the program to generate a basic Memory test program. Download Hardware Platform Xilinx Tools->Program FPGA. Run the Memory_Test_0.elf file, the program starts running. Serial port can be monitored To this SRAM is an embedded system. Select Run->debug under Edk and enter the Debug interface. Add a surveillance window to the following Memory window, address SRAM base address 0x85000000 You can see the content in the memory, the test program fills the data A5A5A5A5 in the memory. summary: Learning to add SRAM memory into the system, you need to pay attention to setting the time parameters of the SRAM chip when setting IP parameters, which is a prerequisite for proper access to the memory. EDK also has a DEBUG function, and debugging software is indispensable. The next step adds all of Nexys3's external memory. Reference link: http://www.xilinx.com/support/documentation/spartan-6.htm http://www.digilentinc.com/products/detail.cfm?navpath=2,400,897&prod=Nexys3 Http://www.microchip.com/wwwproducts/devices.aspx?ddoccname=en531074

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