zl30407qcc Zarlink Semiconductor, zl30407qcc Datasheet - Page 15

• Manufacturer Part Number: zl30407qcc
• Description: Sonet/sdh Network Element Pll
• Manufacturer: Zarlink Semiconductor

2. For 1.5 Hz filtering applications (FCS = 0, FCS2 = 0)
After initiating a reference realignment the PLL will enter Holdover mode for 200ns while aligning the internal clocks
to remove the static phase error. The PLL will then begin the normal locking procedure. The LOCK pin will go low 5
sec after the reference realignment is initiated and will remain low for 10 sec
3. For 6 Hz and 12 Hz filtering applications (FCS = 1, FCS2 = 1 or FCS = 0, FCS2 = 1)
After initiating a reference realignment the PLL will enter Holdover mode for 200 ns while aligning the internal
clocks to remove the static phase error. The PLL will then begin the normal locking procedure. The LOCK pin will
remain high during the realignment process.
3.2.5.2
If the ZL30407 is locked to an 8 kHz reference, then the output clocks can be brought into phase alignment with the
PLL reference by using the RefAlign control bit/pin according to one of the procedures below:
1. For 0.1 Hz filtering applications (FCS = 1, FCS2 = 0)
After initiating a reference realignment the PLL will enter Holdover mode for 200ns while aligning the internal clocks
to remove the static phase error. The PLL will then begin the normal locking procedure. The LOCK pin will go low 5
sec after the reference realignment is initiated and will remain low for 10 sec.
2. For 1.5 Hz filtering applications (FCS = 0, FCS2 = 0)
After initiating a reference realignment the PLL will enter Holdover mode for 200ns while aligning the internal clocks
to remove the static phase error. The PLL will then begin the normal locking procedure. The LOCK pin will go low 5
sec after the reference realignment is initiated and will remain low for 10 sec.
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Wait until the ZL30407 LOCK indication is high, indicating that it is locked
Pull RefAlign low
Hold RefAlign low for 250 Ps
Pull RefAlign high
Wait until the ZL30407 LOCK indication is high, indicating that it is locked
Pull RefAlign low
Hold RefAlign low for 250 Ps
Pull RefAlign high
Wait until the ZL30407 LOCK indicator is high, indicating that it is locked
Pull FCS low
Pull Ref/Align low
Hold RefAlign low for 10 sec
Pull RefAlign high
Wait until the LOCK indicator goes high
Pull FCS high
Wait until the ZL30407 LOCK indication is high, indicating that it is locked
Pull RefAlign low
Hold RefAlign low for 10 sec
Pull RefAlign high
Using RefAlign with an 8 kHz Reference
Zarlink Semiconductor Inc.
ZL30407
15
Data Sheet