[SI-LIST] Re: serial loop-back causing clock error
- From: Raymond.Leung@xxxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 9 Apr 2003 16:20:25 +1000
Hi HShi,
If the transmitter is using an internal clock which is derived from the
recovered
clock, then the internal PLL may lock in a very slow clock rate if you connect
the
transmit pin to the input pin of the same chip.
Regards,
Raymond
"Hong Shi" <HShi@xxxxxxxx> on 09/04/2003 12:11:31
Please respond to HShi@xxxxxxxx
To: si-list@xxxxxxxxxxxxx
cc: (bcc: Raymond Leung/sdc)
Subject: [SI-LIST] serial loop-back causing clock error
Hello worldwide experts,
Here is a question. I am using an external wire to loopback the transmitter
to the receiver on the same serdes. Simple! What I found is that both
recovered clock and the transmitting clock changed to a new slower rate when
loopback in place. As a result, the transmitted data rate is slowed down
accordingly. However, if the same receiver receives signals from a separate
Serdes transmitter, or the same transmitter sending signal to a separate
Serdes receiver, they all work correctly, no clock and data rate change
occurs.
What causes this "feedback" when doing the serial loopback?
Thanks much,
HShi
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