ACS8520T Semtech, ACS8520T Datasheet - Page 77

• Manufacturer Part Number: ACS8520T
• Description: Synchronous Equipment Timing Source (SETS) for Stratum 3/4E/4 and SMC Systems
• Manufacturer: Semtech

Address (hex):
Address (hex):
Use <n> = 3
Revision 3.02/October 2005 © Semtech Corp.
ADVANCED COMMUNICATIONS
Register Name
Register Name
divn_<n>
Bit No.
Bit No.
Bit 7
[7:6]
[5:4]
[3:0]
Bit 7
7
6
Set to zero
21
22
cnfg_ref_source_frequency
_2
Description
Set to zero
bucket_id_2
Every input has its own Leaky Bucket used for
activity monitoring. There are four possible
configurations for each Leaky Bucket- see Reg. 50
to Reg. 5F. This 2-bit field selects the configuration
used for input I2.
Set to zero
cnfg_ref_source_frequency
_<n>, where for Reg 22, n =
3
lock8k_<n>
Description
divn_<n>
This bit selects whether or not input I<n> is divided
in the programmable pre-divider prior to being input
to the DPLL and frequency monitor- see Reg. 46
and Reg. 47 (cnfg_freq_divn).
lock8k_<n>
This bit selects whether or not input I<n> is divided
in the preset pre-divider prior to being input to the
DPLL. This results in the DPLL locking to the
reference after it has been divided to 8 kHz. This bit
is ignored when divn_<n> is set (bit =1).
Bit 6
Bit 6
Bit 5
Bit 5
bucket_id_<n>
bucket_id_2
Description
Description
Bit 4
Bit 4
FINAL
Page 77
(R/W) Configuration of the
frequency and input monitoring
for input I2.
(R/W) Configuration of the
frequency and input monitoring
for input I<n>.
Bit Value
Bit Value
0000
Bit 3
Bit 3
00
00
01
10
11
0
1
0
1
Value Description
Set to zero
Input I2 activity monitor uses Leaky Bucket
Configuration 0.
Input I2 activity monitor uses Leaky Bucket
Configuration 1.
Input I2 activity monitor uses Leaky Bucket
Configuration 2.
Input I2 activity monitor uses Leaky Bucket
Configuration 3.
8 kHz only
reference_source_frequency_<n>
Value Description
Input I<n> fed directly to DPLL and monitor.
Input I<n> fed to DPLL and monitor via pre-divider.
Input I<n> fed directly to DPLL.
Input I<n> fed to DPLL via preset pre-divider.
Bit 2
Bit 2
Set to zero
Default Value
Default Value
ACS8520 SETS
Bit 1
Bit 1
DATASHEET
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0000 0000
0000 0000
Bit 0
Bit 0