I came across the term Symbol Clock Frequency in this Intel programmer reference manual (P131). I could not find what the symbol clock frequency actually is in the manual or online and thought it might be worth asking here.

  • \$\begingroup\$ The term "symbol clock" appears 11 times in that document. Are you sure you couldn't piece this together yourself? \$\endgroup\$ – Andy aka Jun 22 at 21:15

It's the clock at which bytes encoded to 8b10b TMDS symbols are sent over HDMI. For 24-bit resolutions, pixel clock rate matches the symbol clock rate.

Edit: Quote from the linked programmer reference manual:

The PLL output frequencies are 5x the symbol/TMDS rate, which is 1/2 the bit rate.The PLL output is divided by 5 to become the symbol/TMDS clock frequency used in the display engine.

That makes it apparent that symbol rate means the TMDS character rate, and that symbol/TMDS rate is 10x the bit rate.

| improve this answer | |
  • \$\begingroup\$ You should back up your statements with quoted sources. \$\endgroup\$ – user105652 Jun 23 at 4:20

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