rmbracalente
04-30-09, 01:26 PM
I have a non-vendor specific question regarding the HDMI handshake protocol. I have searched around on avsforum as well as google searches, but haven't been able to come up with the information I'm looking for.
What I'm trying to find out is a relatively detailed description of what goes on during the HDMI handshake protocol between an HDMI source and an HDMI sink. In my particular case, the HDMI source does not ever use HDCP, so while details about that part of the process would be interesting, what I'm really after is information about what happens before the HDCP negotiation occurs.
I'm been using an HT-180 HDMI handshake tester from Quantum Data. A very nice device that you insert between the HDMI source & sink and can provide a Wireshark-like trace of the process.
However, even a tool like Wireshark may not help much if you're not familiar with the protocols you're testing, which is kinda the place I'm at with HDMI.
From what I can tell, the only "significant" action that occurs during the handshake process is that the HDMI source may or may not (depending on how it's configured) request to read the EDID information from the sink, after the source detects a HotPlug from the sink.
Once the EDID is read (assuming the source requests it), that's about all I see in trace from the HT-180. But I'm wondering if there must be other steps/signaling going on that the tester isn't showing me?
What I'm trying to find out is a relatively detailed description of what goes on during the HDMI handshake protocol between an HDMI source and an HDMI sink. In my particular case, the HDMI source does not ever use HDCP, so while details about that part of the process would be interesting, what I'm really after is information about what happens before the HDCP negotiation occurs.
I'm been using an HT-180 HDMI handshake tester from Quantum Data. A very nice device that you insert between the HDMI source & sink and can provide a Wireshark-like trace of the process.
However, even a tool like Wireshark may not help much if you're not familiar with the protocols you're testing, which is kinda the place I'm at with HDMI.
From what I can tell, the only "significant" action that occurs during the handshake process is that the HDMI source may or may not (depending on how it's configured) request to read the EDID information from the sink, after the source detects a HotPlug from the sink.
Once the EDID is read (assuming the source requests it), that's about all I see in trace from the HT-180. But I'm wondering if there must be other steps/signaling going on that the tester isn't showing me?