ACS8530 Semtech Corporation, ACS8530 Datasheet - Page 89

• Manufacturer Part Number: ACS8530
• Description: Synchronous Equipment Timing Source For Stratum 2/3E/3 Systems
• Manufacturer: Semtech Corporation

Address (hex):
Address (hex):
Revision 3.01/October 2003 © Semtech Corp.
ADVANCED COMMUNICATIONS
Register Name
Register Name
Bit No.
Bit No.
Bit 7
[7:0]
Bit 7
[7:0]
3D
3E
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 0ppm offset from 12.800 MHz.
This value is an unsigned integer.
cnfg_holdover_frequency
[7:0]
Description
holdover_frequency_value[7:0]
Bit 6
Bit 6
Bit 5
Bit 5
cnfg_nominal_frequency_value[15:8]
Description
Description
holdover_frequency_value[7:0]
Bit 4
Bit 4
FINAL
Page 89
(R/W) Bits [15:8] of the register
used to calibrate the crystal
oscillator used to clock the
device.
(R/W) Bits [7:0] of the manual
Holdover frequency register.
Bit Value
Bit Value
Bit 3
Bit 3
-
-
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.
Value Description
See Reg. 3F (cnfg_holdover_frequency) for details.
Bit 2
Bit 2
Default Value
Default Value
ACS8530 SETS
Bit 1
Bit 1
DATASHEET
www.semtech.com
1001 1001
0000 0000
Bit 0
Bit 0