ACS8526LC Semtech Corporation, ACS8526LC Datasheet - Page 40

• 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
[7:0]
3C
3D
cnfg_nominal_frequency
[7:0]
Description
cnfg_nominal_frequency_value[7:0].
cnfg_nominal_frequency
[15:8]
Description
cnfg_nominal_frequency_value[15:8]
This register is used in conjunction with Reg. 3C
(cnfg_nominal_frequency_value[7:0].) to be able to
offset the frequency of the crystal oscillator by up to
+514 ppm and –771 ppm. The default value
represents 0 ppm offset from 12.800 MHz.
This value is an unsigned integer.
Bit 6
Bit 6
Bit 5
Bit 5
cnfg_nominal_frequency_value[15:8]
cnfg_nominal_frequency_value[7:0]
Description
Description
Bit 4
Bit 4
FINAL
Page 40
(R/W) Bits [7:0] of the register
used to calibrate the crystal
oscillator used to clock the
device.
(R/W) Bits [15:8] of the register
used to calibrate the crystal
oscillator used to clock the
device.
Bit Value
Bit Value
Bit 3
Bit 3
-
-
Value Description
See register description of Reg. 3D
(cnfg_nominal_frequency_value[15:8]).
Value Description
In order to program the ppm offset of the crystal
oscillator frequency, the value in Reg. 3C and
Reg. 3D need to be concatenated. This value is an
unsigned integer. The value multiplied by
0.0196229 dec. will give the value in ppm. To
calculate the absolute value, the default 39321
(9999 hex) needs to be subtracted.
Bit 2
Bit 2
ACS8526 LC/P LITE
Default Value
Default Value
Bit 1
Bit 1
DATASHEET
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1001 1001
1001 1001
Bit 0
Bit 0