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High-speed voltage D+ and D- in high-speed current mode in USB 2.0

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nguyenvanthien

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Hi all,
I'm studying high-speed mode in USB 2.0.
This mode has the control pin: HS_current_source_enabled (HCSE). When HCSE is asserted, transmit signals must comply eye patterns. Moreover, it must be true with the first symbol of a packet. I haven't understanded that: what is first symbol? Is it synchronous bit (K,J,...) or data after synchronous bits?
Thank you very much!
 

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