GS9064A Data Sheet
37325 - 0 December 2005 13 of 16
4.4 Mute and Carrier Detect
In addition to the programmable mute output and cable length indicator, the
GS9064A includes a multi-function CD
/MUTE bidirectional pin that provides the
following functions:
INPUT (MUTE)
Applying a HIGH INPUT to the CD
/MUTE pin forces the GS9064A outputs to a
muted condition. The minimum voltage required to force the outputs to a muted
condition is listed in the DC electrical characteristics table. In this condition the
outputs will be latched to the last logic level present at the output to avoid signal
crosstalk.
Applying a LOW INPUT to the CD
/MUTE pin will force the GS9064A outputs to
remain active regardless of the length of input cable and the voltage applied to the
MCLADJ pin. See the DC electrical characteristics table for voltage levels.
OUTPUT (CD
)
When used as an OUTPUT, the CD
/MUTE pin will indicate the presence of a valid
input signal. When CD
/MUTE is LOW, a valid input signal has been detected at the
input of the device. When CD
/MUTE is HIGH, the input signal is invalid. This pin
will indicate loss of carrier for data rates greater than 19Mb/s.
NOTE: The CD
/MUTE pin is not functional in BYPASS mode..
