ACS8509 Semtech Corporation, ACS8509 Datasheet - Page 26
ACS8509
Manufacturer Part Number
ACS8509
Description
Synchronous Equipment Timing Source for Sonet or SDH Network Elements
Manufacturer
Semtech Corporation
Datasheet
1.ACS8509.pdf
(68 pages)
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