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PMC-Sierra, Inc.
PM73121AAL1gator II
L
PMC-980620
,VVXH
AAL1 SAR Processor
Data Sheet
35235,(7$5<$1'&21),'(17,$/7230&6,(55$,1&$1')25,76&86720(56,17(51$/86(
6.2
Figure 59, Figure 60,
Figure 61 on page 96
, and
Figure 62 on page 96
show the receiver transmits
data to the lines for low-speed applications. These lines typically interface with the transmit input
portion of the corresponding framer. The AAL1gator II drives the same signaling data onto TL_
SIG during each frame of a multiframe. Data is output off the rising edge of TL_CLK, and TL_
FSYNC and TL_MSYNC are sampled using the falling edge of TL_CLK. The timing parameters
are explained in the tables following the figures.
Receive Side Line Interface Timing
The format of signaling data on the TL_SIG output is dependent on the framer operating mode.
When operating in T1 mode, the AAL1gator II drives signaling only on the lower four bits of each
timeslot as shown in
Table 15 on page 93
and Figure 60. In all cases, signaling data is driven on
the TL_SIG pin for all frames of each multiframe.
The rising edge of TL_FSYNC should occur only during the frame (F) bit of the T1 data stream.
The rising edge of TL_MSYNC should occur only during the F bit that starts each 12-frame (SF)
or 24-frame (ESF) multiframe. If a sync input occurs when it is not expected, the AAL1gator II
will resync to the new structure. The sync pulses do not have to be driven every frame or multi-
frame.
Figure 59.
Receive Side Low-Speed Interface Bit Timing
Symbol
Parameter
Signals
Min
Max
Unit
Fc
Clock frequency
TL_CLK
15
MHz
Tcp
Clock pulse width
TL_CLK
10
ns
Tsu
Clock setup
TL_MSYNC, TL_FSYNC
5
ns
Th
Clock hold
TL_MSYNC, TL_FSYNC
1
ns
Tq
Clock-to-output delay
TL_SIG, TL_SER
2
14
ns
Tsu
Tcp
Tcp
Fc
Th
Tq
TL_CLK(i)
TL_FSYNC(i)
TL_MSYNC(i)
TL_SIG(o)
TL_SER(o)