Interface Debug - 5.4 English

MIPI CSI-2 Receiver Subsystem LogiCORE IP Product Guide (PG232)

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5.4 English

AXI4-Lite Interfaces

Read from a register that does not have all 0s as a default to verify that the interface is functional. See the folloeing figure for a read timing diagram. Output s_axi_arready asserts when the read address is valid, and output s_axi_rvalid asserts when the read data/response is valid. If the interface is unresponsive, ensure that the following conditions are met:

  • The lite_aclk inputs are connected and toggling.
  • The interface is not being held in reset, and lite_aresetn is an active-Low reset.
  • The main subsystem clocks are toggling and that the enables are also asserted.
  • If the simulation has been run, verify in simulation and/or a debug feature capture that the waveform is correct for accessing the AXI4-Lite interface.
Figure 1. AXI4-Lite Timing

AXI4-Stream Interfaces

If data is not being transmitted or received, check the following conditions:

  • If transmit <interface_name>_tready is stuck Low following the <interface_name>_tvalid input being asserted, the subsystem cannot send data.
  • If the receive <interface_name>_tvalid is stuck Low, the subsystem is not receiving data.
  • Check that the video_aclk and dphy_clk_200M inputs are connected and toggling.
  • Check subsystem configuration.
  • Ensure “Stream line buffer full” condition not getting reported in subsystem Interrupt Status register.
  • Sideband Information on AXI4-Stream Interfaces.
  • Sideband information such as frame and line number appear on the TUSER signal of the AXI4-Stream interface.
  • Start of fame, frame number, line number, word count, and data type need to be sampled by you on the first beat of the transfer.
  • Frame Number and Line number is an optional information set by the TX. According to the MIPI CSI-2 specification, TX can send a fixed "0" if these information is not used.
  • Packet Error, ECC, and CRC need to be sampled by you on the last beat of the transfer.
  • The side band information are optionally sent by the sensor. Refer to the Low Level Protocol section of MIPI CSI-2 standard v2.0 for more details.
Figure 2. Sideband Information (TUSER) Timing Diagram