ACS8526LC Semtech Corporation, ACS8526LC Datasheet - Page 35

• Manufacturer Part Number: ACS8526LC
• Description: Line Card Protection Switch for PDH, Sonet or SDH Systems
• Manufacturer: Semtech Corporation

Address (hex):
Address (hex):
Revision 4.01/June 2006 © Semtech Corp.
ADVANCED COMMUNICATIONS
Register Name
Register Name
Bit No.
Bit No.
Bit 7
[7:0]
Bit 7
[7:6]
[3:2]
5
1
0
0D
11
sts_current_DPLL_frequency
[15:8]
Description
Bits [15:8] of sts_current_DPLL_frequency
The value in this register is combined with the value
in Reg. 0C and Reg. 07 to represent the current
frequency offset of the DPLL.
When Bit 4 (DPLL1_DPLL2_select) of Reg. 4B
(cnfg_registers_source_select) = 0 the frequency
for DPLL1 is reported.
When this Bit 4 = 1 the frequency for DPLL2 is
reported.
sts_reference_sources
SEC1 & SEC2
Description
Not Used
SEC2 Input Activity Alarm
Alarm indication from the activity monitors.
Not Used
SEC1 Input Activity Alarm
Alarm indication from the activity monitors.
Not Used
Bit 6
Bit 6
No Activity
SEC2 Input
Bit 5
Bit 5
Bits [15:8] of sts_current_DPLL_frequency
Description
Description
Bit 4
Bit 4
FINAL
Page 35
(RO) Bits [15:8] of the current
DPLL frequency.
(RO except for test when R/W)
Reports any alarms active on
inputs.
Bit Value
Bit Value
Bit 3
Bit 3
0
1
0
1
-
-
-
-
Value Description
In order to calculate the ppm offset of the DPLL with
respect to the crystal oscillator frequency, the value
in Reg. 07, Reg. 0D and Reg. 0C need to be
concatenated. This value is a 2’s complement
signed integer. The value multiplied by
0.0003068 dec. will give the value in ppm offset
with respect to the XO frequency, allowing for any
crystal calibration that has been performed, via
cnfg_nominal_frequency, Reg. 3C and 3D. The
value is actually the DPLL integral path value so it
can be viewed as an average frequency, where the
rate of change is related to the DPLL bandwidth. If
Bit 3 of Reg. 3B is High then this value will freeze if
the DPLL has been pulled to its min or max
frequency.
Value Description
-
No alarm (input valid).
Input has an active “no activity” alarm.
-
No alarm (input valid).
Input has an active “no activity” alarm.
-
Bit 2
Bit 2
ACS8526 LC/P LITE
Default Value
Default Value
No Activity
SEC1 Input
Bit 1
Bit 1
DATASHEET
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0000 0000
0010 0010
Bit 0
Bit 0