ACS8582 Semtech Corporation, ACS8582 Datasheet - Page 58

• Manufacturer Part Number: ACS8582
• Manufacturer: Semtech Corporation

Address (hex):
Address (hex):
Revision 1.00/March 2008 ©Semtech Corp.
ADVANCED COMMS & SENSING
Register Name
Register Name
Bit No.
Bit No.
Bit 7
[7:3]
[2:0]
Bit 7
[7:4]
[3:0]
32
33
cnfg_operating_mode
Description
Not used.
T0_DPLL_operating_mode
This field is used to control the state of the internal
finite state machine controlling the T0 DPLL. A value
of zero is used to allow the finite state machine to
control itself. Any other value will force the state
machine to jump into that state. Care should be
taken when forcing the state machine. While it is
forced, the internal monitoring functions cannot
affect the internal state machine; therefore, the
user is responsible for all monitoring and control
functions required to achieve the desired
functionality.
force_select_reference_source
Description
Not used.
forced_reference_source
Value representing the source to be selected by the
T0 DPLL. A value of zero will leave the selection to
the automatic control mechanism within the device.
Using this mechanism will bypass all the monitoring
functions assuming the selected input to be valid. If
the device is not in state “Locked” then it will
progress to state locked in the usual manner. If the
input fails, the device will not change state to
“Holdover”, as it is not allowed to disqualify the
source.
The effect of this register is simply to raise the
priority of the selected input reference to “1”
(highest). To ensure selection of the programmed
input reference under all circumstances, Revertive
mode should be enabled (Reg. 34 Bit 0 set to “1”).
Bit 6
Bit 6
Bit 5
Bit 5
Description
Description
CONFIDENTIAL
Bit 4
Bit 4
FINAL
Page 58
(R/W) Register to force the state
of the TO DPLL controlling state
machine.
(R/W) Register used to force the
selection of a particular reference
source for the T0 DPLL.
All other values
Bit Value
Bit Value
0000
0011
0100
1111
Bit 3
Bit 3
000
001
010
011
100
101
110
111
-
-
Value Description
-
Automatic (internal state machine controlled).
Free Run.
Holdover.
Not used.
Locked.
Pre-locked2.
Pre-locked.
Phase Lost.
Value Description
-
Automatic state machine source selection
T0 DPLL forced to select input SEC1.
T0 DPLL forced to select input SEC2.
Automatic.
Not used.
forced_reference_source
Bit 2
Bit 2
T0_DPLL_operating_mode
Default Value
Default Value
Bit 1
Bit 1
ACS8582
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0000 0000
0000 1111
Bit 0
Bit 0