THCV231-Q_THCV236-Q_Rev.2.60_E
Hot-Plug Function
HTPDN signal indicates connecting condition between the Transmitter and the Receiver. HTPDN of the
transmitter side is high when the Receiver is not active or not connected. Then the Transmitter can enter into the
power down mode. HTPDN is set to low by the Receiver when the Receiver is active and connects to the
Transmitter, and then the Transmitter must start up and transmit CDR training pattern for link training.
HTPDN is transferred to the Transmitter via Sub-Link line. HOST MPU can confirm HTPDN state by reading
Sub-Link Master register (0x00 bit0 HTPDN).
Lock Detect Function
LOCKN indicates whether the receiver CDR PLL is in the lock state or not. LOCKN at the Transmitter input is
set to High when the Receiver is not active or at the CDR PLL training state. LOCKN is set to low by the Receiver
when CDR lock is done. Then the CDR training mode finishes and the Transmitter shifts to the normal operation.
LOCKN is transferred via Sub-Link line. HOST MPU can confirm LOCKN state by reading Sub-Link Master
register (0x00 bit1 LOCKN).
Figure 4. HTPDN, LOCKN transmission route
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