ACS8509 Semtech Corporation, ACS8509 Datasheet - Page 26

• 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
13
15
16
1B
1D
1E
Addr.
(Hex)
sts_reference_sources
cnfg_ref_selection_
priority
Register Name
This is a 3-byte register which holds the status of each of the 4 input reference
sources. The status of each reference source is shown in a 4-bit field. Each bit is
active high. To aid status checking, a copy of each status bit 3 is provided in the
sts_sources_valid register. The status is reported as follows: (Each bit may be cleared
individually.)
Status bit 3 = Source valid (no alarms) (bit 3 is combination of bits (2:0)) (default 0)
Status bit 2 = out-of-band alarm (default 1)
Status bit 1 = no activity alarm (default 1)
Status bit 0 = phase lock alarm (default 0)
Bits (7:4) Status of input reference source <SEC2>.
Bits (3:0) Status of input reference source <SEC1>.
Bits (7:4) Unused.
Bits (3:0) Status of input reference source <SEC3>.
Bits (7:4) Unused.
Bits (3:0) Status of input reference source <SEC4>.
This register holds the priority of each of the 4 input reference sources. The priority
values are all relative to each other, with lower-valued numbers taking higher
priorities. Only the values “1” to “15” (dec) are valid - “0” disables the reference
source. Each reference source should be given a unique number, however two
sources given the same priority number will be assigned on a first in first out basis.
It is recommended to reserve the priority value “1” as this is used when forcing
reference selection via the cnfg_ref_selection register. If the User does not intend to
use the cnfg_ref_selection register then the priority value “1” need not be reserved.
Bits (7:4) Programmed priority of input reference source <SEC2>.
Bits (3:0) Programmed priority of input reference source <SEC1>.
Bits (7:4) Unused.
Bits (3:0) Programmed priority of input reference source <SEC3>.
Bits (7:4) Unused.
Bits (3:0) Programmed priority of input reference source <SEC4>.
FINAL
Page 26
Description
ACS8509 SETS
Default Value (Bin)
DATASHEET
www.semtech.com
(MSTSLVB=0)
(MSTSLVB=1)
01100110
01100110
01100110
10011000
11010001
11011100
11111110