ACS8520 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'ACS8520' PDF : 150 Pages View PDF
ACS8520 SETS
ADVANCED COMMUNICATIONS
Address (hex): 7A (cont...)
Register Name cnfg_sync_pulses
FINAL
DATASHEET
Description
(R/W) Register to configure the Default Value
Sync outputs available from TO10
and TO11 and select the source
for the 2 kHz and 8 kHz outputs
from T01 - TO7.
0000 0000
Bit 7
2k_8k_from_T4
Bit 6
Bit 5
Bit 4
Bit 3
8k_invert
Bit 2
8k_pulse
Bit 1
2k_invert
Bit 0
2k_pulse
Bit No.
Description
Bit Value Value Description
0
2k_pulse
Register bit to enable the 2 kHz output from TO11
to be either pulsed or 50:50 duty cycle. Output TO3
must be enabled to use “pulsed output” mode on
output TO10, and then the pulse width on TO11 will
be defined by the period of the output programmed
on TO3.
0
2 kHz TO11 output not pulsed.
1
2 kHz TO11 output pulsed.
Address (hex): 7B
Register Name cnfg_sync_phase
Description
(R/W) Register to configure the Default Value
behavior of the synchronization
for the external frame reference.
0000 0000
Bit 7
indep_FrSync/
MFrSync
Bit 6
Sync_OC-N_
rates
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Sync_phase
Bit 0
Bit No.
Description
Bit Value Value Description
7
indep_FrSync/MFrSync
This allows the option of either maintaining
alignment of FrSync and other clock outputs during
synchronization from the SYNC2K input, or whether
to not maintain alignment to all clocks and so not
disturb any of the output clocks
6
Sync_OC-N_rates
This allows the SYNC2K input to synchronize the
OC-3 derived clocks in order to maintain alignment
between the FrSync output and output clocks and
allow a finer sampling precision of the SYNC2K
input of either 19.44 MHz or 38.88 MHz.
[5:2]
Not used.
0
MFrSync & FrSync outputs are always aligned with
other output clocks.
1
MFrSync & FrSync outputs are independent of other
output clocks.
0
The OC-N rate clocks are not affected by the
SYNC2K input. The SYNC2K input is sampled with a
6.48 MHz precision. 6.48MHz should be provided
as the input reference clock.
1
Allows the SYNC2K to operate with a 19.44 MHz or
38.88 MHz input clock reference. Input sampling
and output alignment to 19.44 MHz is used when
the current clock input is 19.44 MHz, otherwise
38.88 MHz sampling precision is used.
Revision 3.02/October 2005 © Semtech Corp.
Page 128
www.semtech.com
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