ACS8509 Semtech Corporation, ACS8509 Datasheet - Page 32

• Manufacturer Part Number: ACS8509
• Description: Synchronous Equipment Timing Source for Sonet or SDH Network Elements
• Manufacturer: Semtech Corporation

Table 14 Register Description (cont...)
Revision 2.00/January 2006 © Semtech Corp.
ADVANCED COMMUNICATIONS
3A
3B
3C
3D
Addr.
(Hex)
cnfg_differential_
outputs
cnfg_bandwidth
cnfg_nominal_frequency
Register Name
This register holds the frequency selections and the port-technology type for the
differential output O1 as detailed below.
Bits (7:6) Output O1:
00
01
10
11
Bits (3:2) Output O1:
00
01
10
11
This register contains information used to control the operation of the digital PLL.
When bandwidth selection is set to automatic, the DPLL will use the acquisition
bandwidth setting when out of lock, and the normal/locked bandwidth setting when
in lock. When set to manual, the DPLL will always use the normal/locked bandwidth
setting.
Bit 7
=1
=0
Bits (6:4) Acquisition bandwidth:Bit (2:0)
000
001
010
011
100
101
110
111
Bit 3
This register holds a 16 bit unsigned integer allowing compensation for offset of the
crystal oscillator from the nominal 12.8 MHz. See “Crystal Frequency Calibration” on
page 8. Default results in 0 ppm adjustment.
Bits (7:0) cnfg_nominal_frequency bits (7:0).
Bits (7:0) cnfg_nominal_frequency bits (15:8).
155.52 MHz,
51.84 MHz,
77.76 MHz,
19.44 MHz (default).
Port disabled,
PECL-compatible (default),
LVDS-compatible,
Unused.
Automatic operation,
Manual operation (default).
0.1 Hz,
0.3 Hz,
0.5 Hz,
1.0 Hz,
2.0 Hz,
4.0 Hz,
8.0 Hz,
17 Hz (default).
Unused.
FINAL
Page 32
000
001
010
011
100
101
110
111
Description
Bits (5:4) Unused
Bits (1:0) Unused
Loop bandwidth:
0.1 Hz,
0.3 Hz,
0.5 Hz,
1.0 Hz,
2.0 Hz,
4.0 Hz (default),
8.0 Hz,
17 Hz.
ACS8509 SETS
Default Value (Bin)
DATASHEET
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11000110
10011001
10011001
0111X101