ACS8520T Semtech, ACS8520T Datasheet - Page 85

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

Address (hex):
Address (hex):
Revision 3.02/October 2005 © Semtech Corp.
ADVANCED COMMUNICATIONS
Register Name
lock_T4_to_T0
Register Name
Bit No.
Bit No.
Bit 7
[3:0]
Bit 7
[7:2]
1
0
35 (cont...)
36
cnfg_T4_path
T4_dig_feed-
back
Description
T4_forced_reference_source
This field can be used to force the T4 DPLL to select
a particular input. A value of zero in this field allows
the T4 input to be selected automatically via the
priority and input monitoring functions.
cnfg_differential_inputs
Description
Not used.
I6_PECL
Configures the I6 input to be compatible with either
3 V LVDS or 3 V PECL electrical levels.
I5_LVDS
Configures the I5 input to be compatible with either
3 V LVDS or 3 V PECL electrical levels.
Bit 6
Bit 6
Bit 5
Bit 5
Description
T4_op_from_T0
Description
Bit 4
Bit 4
FINAL
Page 85
Register to configure the inputs
and other features in the T4 path.
(R/W) Configures the differential
inputs to be PECL or LVDS type
inputs.
Bit Value
Bit Value
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Bit 3
Bit 3
0
1
0
1
-
Value Description
T4 DPLL automatic source selection.
T4 DPLL forced to select input I1.
T4 DPLL forced to select input I2.
T4 DPLL forced to select input I3.
T4 DPLL forced to select input I4.
T4 DPLL forced to select input I5.
T4 DPLL forced to select input I6.
T4 DPLL forced to select input I7.
T4 DPLL forced to select input I8.
T4 DPLL forced to select input I9.
T4 DPLL forced to select input I10.
T4 DPLL forced to select input I11.
T4 DPLL forced to select input I12.
T4 DPLL forced to select input I13.
T4 DPLL forced to select input I14.
Not used.
Value Description
-
I6 input LVDS compatible.
I6 input PECL compatible (Default).
I5 input LVDS compatible (Default).
I5 input PECL compatible.
T4_forced_reference_source
Bit 2
Bit 2
Default Value
Default Value
I6_PECL
ACS8520 SETS
Bit 1
Bit 1
DATASHEET
www.semtech.com
0100 0000
0000 0010
I5_LVDS
Bit 0
Bit 0