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USB 0 hardware setup

smvo555

Hi,

What is the proper way to connect bank 501 USB MIO pins to my design?
I want to set up communication between PC and Microzed.
Is it as easy to use as the USB UART which connects to the micro USB?

I'm not able to synchronize the read port of my dual port BRAM with the default USB UART connecting to the micro USB as there are no synchronization signals that I am aware of.

Thanks, advice is much appreciated

Sam

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  • 0

    I think I may have caused some of the confusion by inadvertently typing 'UART' after the SMSC 3320 device in my comment above. The SMSC USB interface and the Silicon Labs USB UART are separate interfaces. The micro USB connector J2 is connected to the Silicon Labs CP2104 USB UART device which drives the Zynq ps_uart1 via MIO signals 48 and 49. By default the BSP generated by the SDK will set this port as the stdin/stdout port. You do need to load a driver for the Silicon Labs USB-UART device on your PC.

     

    The SMSC USB3320 USB device is connected to the USB Type A connector on the combination Ethernet RJ45/USB Type A connector J1 on the MicroZed. The default mode for the USB port on the MicroZed is Host mode. In this mode the MicroZed provides the Vbus supply but the amount of power available is very limited if the MicroZed is powered by the USB-UART port alone. You can configure the USB port to Device Mode. See Section 2.3 of the MicroZed HW Users Guide and the MicroZed Schematic for details. They can be downloaded here: http://zedboard.org/support/documentation/1519

     

    You do not need the axi usb device. What drivers you need depend on which mode you are using and if you are 'bare metal' or running under an OS like Linux.

     

    -Gary

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  • 0

    I think I may have caused some of the confusion by inadvertently typing 'UART' after the SMSC 3320 device in my comment above. The SMSC USB interface and the Silicon Labs USB UART are separate interfaces. The micro USB connector J2 is connected to the Silicon Labs CP2104 USB UART device which drives the Zynq ps_uart1 via MIO signals 48 and 49. By default the BSP generated by the SDK will set this port as the stdin/stdout port. You do need to load a driver for the Silicon Labs USB-UART device on your PC.

     

    The SMSC USB3320 USB device is connected to the USB Type A connector on the combination Ethernet RJ45/USB Type A connector J1 on the MicroZed. The default mode for the USB port on the MicroZed is Host mode. In this mode the MicroZed provides the Vbus supply but the amount of power available is very limited if the MicroZed is powered by the USB-UART port alone. You can configure the USB port to Device Mode. See Section 2.3 of the MicroZed HW Users Guide and the MicroZed Schematic for details. They can be downloaded here: http://zedboard.org/support/documentation/1519

     

    You do not need the axi usb device. What drivers you need depend on which mode you are using and if you are 'bare metal' or running under an OS like Linux.

     

    -Gary

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  • 0 in reply to Former Member

    Thanks Gary,
    I think I have a lot of ground to cover in my understanding of embedded systems.
    I found some drivers and API in my install directory listed below.
    C:XilinxSDK2014.1dataembeddedswXilinxProcessorIPLibdriversusb_v5_0dochtmlapi

    Please check my understanding, corrections can save me a lot of time.
    -The hardware for USB0 is already set up, so I only need to enable USB0 and make the MIO pins external in my block design for the usb etc..
    -I want to read data from PL, so I will make the data available on the EMIO
    -I will use the drivers and api in SDK to output the data on USB0 from EMIO.

    Besides the 8 data bits on USB0 , I see also the signals
    dir , stp ,nxt ,clk
    Is nxt a signal I can use to enable my read address to increment synchronously with clk?
    This is what I am mostly concerned with, I'm wondering if I am thinking about the issue of synchronization wrong. Is it possible to memory map my BRAM and send bursts of data to the processor for USB output? Would this be the correct way?

    Thanks
    Sam

  • 0 in reply to smvo555

    The hardware for USB0 is already set up if you select it and the MIO connections are as well if you used the board preset when you created your block design in Vivado. You do not need to make anything more external or add any EMIO connections.


    If you memory map your BRAM then you can use the SDK drivers to transfer the data using DMA or any other means. You do not need to deal with any of the signals directly.


    You will want to use the usbps_v2_1 drivers, not the usb_v5 drivers. Once you export your design to the SDK and generate a BSP you should be able to open the system.mss file under your BSP in the Project Explorer pane on the left in the SDK. Then, in the system.mss file, under the 'Peripheral Driver' section you can click on the 'Documentation' and 'Examples' links next to your peripheral, ps7_usb_0 in this case, to see example code for your peripheral.


    -Gary