41.6.6.2 BER Testing Pattern

The BER testing pattern simplifies conformance testing. This pattern tests the RX D-PHY capability to receive the data correctly. The following data patterns are required:

  • X bytes of 0xAA (high-frequency pattern, inverted)
  • X bytes of 0x33 (mid-frequency pattern)
  • X bytes of 0xF0 (low-frequency pattern, inverted)
  • X bytes of 0x7F (lone 0 pattern)
  • X bytes of 0x55 (high-frequency pattern)
  • X bytes of 0xCC (mid-frequency pattern, inverted)
  • X bytes of 0x0F (low-frequency pattern)
  • Y bytes of 0x80 (lone 1 pattern)

In most cases, Y is equal to X. However, depending on line length and the color coding used, Y may be a different value than X. With RGB888 color coding and horizontal resolution in multiples of eight, the following pattern appears on the DSI display:

Figure 41-13. RGB888 BER Testing Pattern

Depending on the orientation, BER mode, and color coding, the smallest resolutions accepted by the video mode pattern generator are:

  • BER mode: 8x8
  • Horizontal color bar mode: 8x8
  • Vertical color bar mode: 8x8