ACS8520T Semtech, ACS8520T Datasheet - Page 86

• 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
Register Name
Bit No.
Bit No.
Bit 7
[7:3]
[2:0]
Bit 7
[4:0]
7
6
5
37
38
cnfg_uPsel_pins
Description
Not used.
upsel_pins_value
This register always reflects the value present on
the UPSEL pins of the device. At reset this is used to
set the mode of the microprocessor interface.
Following power-up, these pins have no further
effect on the microprocessor interface, hence it is
possible to use the pins and register combination as
a general purpose input for software.
*The default of this register is entirely dependent
on the value of the pins at reset.
cnfg_dig_outputs_sonsdh
dig2_sonsdh
Description
Not used.
dig2_sonsdh
Selects whether the frequencies generated by the
Digital2 frequency generator are SONET derived or
SDH.
*Default value of this bit is set by the SONSDHB pin
at power-up.
dig1_sonsdh
Selects whether the frequencies generated by the
Digital1 frequency generator are SONET derived or
SDH.
*Default value of this bit is set by the SONSDHB pin
at power-up.
Not used.
Bit 6
Bit 6
dig1_sonsdh
Bit 5
Bit 5
Description
Description
Bit 4
Bit 4
FINAL
Page 86
(RO) Register reflecting the value
on the UPSEL device pins.
Configures Digital1 and Digital2
output frequencies to be SONET
or SDH compatible frequencies.
(value at reset)
Bit Value
Bit Value
Bit 3
Bit 3
000
001
010
011
100
101
110
111
1
0
1
0
-
-
-
Value Description
-
Not used.
Interface in EPROM boot mode.
Interface in Multiplexed mode.
Interface in Intel mode.
Interface in Motorola mode.
Interface in Serial mode.
Not used.
Not used.
Value Description
-
Digital2 can be selected from 1544/3088/6176/
12352 kHz.
Digital2 can be selected from 2048/4096/8192/
16384 kHz.
Digital1 can be selected from 1544/3088/6176/
12352 kHz.
Digital1 can be selected from 2048/4096/8192/
16384 kHz.
-
Bit 2
Bit 2
upsel_pins_value
Default Value
Default Value
ACS8520 SETS
Bit 1
Bit 1
DATASHEET
www.semtech.com
0000 0010*
0001 1111*
Bit 0
Bit 0