GS9076 查看數據表（PDF） - Semtech Corporation
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GS9076 Datasheet PDF : 25 Pages
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GS9076 Data Sheet
4.8 Bypass Mode
In Bypass mode, the GS9076 passes the data at the inputs directly to the outputs.
There are two pins that control the bypass function: BYPASS and AUTOBYPASS.
When BYPASS is set HIGH, the GS9076 will be in Bypass mode.
When AUTOBYPASS is set HIGH, the GS9076 will be configured to enter Bypass
mode only when the PLL has not locked to a data rate. When BYPASS is set HIGH,
AUTOBYPASS will be ignored.
When the PLL is not locked, and both BYPASS and AUTOBYPASS are set LOW,
the serial digital output DDO0/DDO0 or DDO1/DDO1 will produce invalid data.
4.9 Lock and LOS
The LOCKED signal is an active high output which indicates when the PLL is
locked.
The internal lock logic of the GS9076 includes a system which monitors the
Frequency Acquisition Loop and the Phase Acquisition Loop as well as a monitor
to detect harmonic lock.
The LOS (Loss of Signal) output is an active HIGH output which indicates the
absence of data transitions at the DDIx input. In order for this output to be asserted,
transitions must not be present for a period of tLA = 5 - 10 us. After this output has
been asserted, LOS will deassert within tLD = 0 - 5 us after the appearance of a
transition at the DDIx input.
t LA
t LD
DATA
LOS
Figure 4-3: LOS signal timing
NOTE: LOS is sensitive to transitions appearing at the input, and does not
distinguish between transitions caused by input data, and transitions due to noise.
44617 - 1 January 2008
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