ACS8514 Semtech Corporation, ACS8514 Datasheet - Page 55

• Manufacturer Part Number: ACS8514
• Description: Synchronous Equipment Timing Source Partner IC for 2nd T4 Dpll, Accurate Monitoring & Input Extender
• Manufacturer: Semtech Corporation

Revision 3.00 April 2007 © Semtech Corp.
Address(hex): 4B
Address(hex): 4C
Register Name
Register Name
ADVANCED COMMS & SENSING
Bit No.
Bit No.
Bit 7
[7:0]
Bit 7
[7:5]
[3:0]
4
sts_freq_measurement
Description
freq_measurement_value
This represents the value of the frequency
measurement on the channel number selected in
register 4B. This value will represent the offset in
frequency from the external crystal oscillator .
Ensure register 48, bit 7 = 1
Not used.
cnfg_registers_source_select
Description
T4orMon_select
Bit to select between the Monitor DPLL and T4 DPLL
values for: registers 0A, 0B, 0C, 0D, 07, 18 to 1E,
77 and 78
frequency_measurement_channel_select
Register to select which input channel the frequency
measurement result in register 4C is taken from.
Bit 6
Bit 6
Bit 5
Bit 5
Description
Description
T4orMon_select
freq_measurement_value
Bit 4
Bit 4
Page 55
FINAL
(R/W) Register from which the
frequency measurement result
can be read.
(R/W) Register to select the
source of many of the registers.
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
-
-
frequency_measurement_channel_select
Value Description
-
Monitor DPLL registers selected.
T4 DPLL registers selected.
Not used- refers to no input channel.
Frequency measurement taken from input I1.
Frequency measurement taken from input I2.
Frequency measurement taken from input I3.
Frequency measurement taken from input I4.
Frequency measurement taken from input I5.
Frequency measurement taken from input I6.
Frequency measurement taken from input I7.
Frequency measurement taken from input I8.
Frequency measurement taken from input I9.
Frequency measurement taken from input I10.
Frequency measurement taken from input I11.
Frequency measurement taken from input I12.
Frequency measurement taken from input I13.
Frequency measurement taken from input I14.
Not used- refers to no input channel.
Value Description
This is an 8-bit 2's complement signed integer.
To calculate the offset in ppm of the selected
input channel, this value should be multiplied by
3.81 ppm.
ACS8514 SETS Buddy
Bit 2
Bit 2
Default Value
Default Value
Bit 1
Bit 1
DATASHEET
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0000 0000
0000 0000
Bit 0
Bit 0