ACS8514T View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
ACS8514T
Synchronous Equipment Timing Source Partner IC for 2nd T4 DPLL, Accurate Monitoring & Input Extender
Semtech Corporation
'ACS8514T' PDF : 86 Pages View PDF
ACS8514 SETS Buddy
ADVANCED COMMS & SENSING FINAL
DATASHEET
Address(hex): 4D
Register Name cnfg_DPLL_soft_limit
Bit 7
Bit 6
Bit 5
Description
Bit 4
(R/W) Register to program the
soft frequency limit of the two
DPLLs. Exceeding this limit will
have no effect beyond triggering
a flag.
Bit 3
Bit 2
Default Value
Bit 1
1000 1110
Bit 0
freq_lim_
ph_loss
Bit No.
Description
DPLL_soft_limit_value
Bit Value Value Description
7
freq_lim_ph_loss
0
Phase lost/locked determined normally.
Bit to enable the phase lost indication when the
DPLL hits its hard frequency limit as programmed in
1
Phase lost force when DPLL tracks to hard limit.
register 41h & 42h (cnfg_DPLL_freq_limit ). This
results in the DPLL entering the phase lost state any
time the DPLL tracks to the extent of its hard limit.
It applies to both the Monitor DPLL and the T4 DPLL
[6:0]
DPLL_soft_limit_value
Register to program to what extent either of the
DPLLs tracks a source before raising its soft
frequency alarm flag (Bits 5 and 4 of register 09h).
This offset is compared to the crystal oscillator
frequency taking into account any programmed
calibration from registers 3C & 3D.
-
To calculate the ppm offset multiply this 7-bit
value by 0.628 ppm. The limit is symmetrical
about zero. A value of 0001110 bin is equivalent
to ±8.79 ppm.
Address(hex): 50
Register Name cnfg_upper_threshold_0
Bit 7
Bit 6
Bit 5
Description
Bit 4
(R/W) Register to program the
activity alarm setting limit for
Leaky Bucket Configuration 0.
Bit 3
Bit 2
Default Value 0000 0110
Bit 1
Bit 0
upper_threshold_0_value
Bit No.
Description
Bit Value Value Description
[7:0]
upper_threshold_0_value
00000001 Value at which the Leaky Bucket will raise an
The Leaky Bucket type activity monitor operates on
to
inactivity alarm.
a 128 ms cycle. If, during a cycle, it detects that an
11111111
input has either failed or has been erratic, then for
each cycle in which this occurs, the accumulator is
incremented by 1, and for each period of 1, 2, 4, or
8 cycles, as programmed in register 53h, in which
this does not occur, the accumulator is
decremented by 1.
When the accumulator count reaches the value
programmed as the upper_threshold_0_value, the
activity monitor raises an input inactivity alarm.
Revision 3.00 April 2007 © Semtech Corp.
Page 56
www.semtech.com
Share Link: 