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AD9545 Datasheet(PDF) 113 Page - Analog Devices

Part # AD9545
Description  Quad Input, 10-Output, Dual DPLL/IEEE 1588 1 pps Synchronizer and Jitter Cleaner
PDF  157 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9545 Datasheet(HTML) 113 Page - Analog Devices

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Data Sheet
AD9545
Rev. A | Page 113 of 157
REFERENCE
TDCS
TIME STAMP SOURCES
PING-PONG
TDC
DIGITAL
CROSS
POINT MUX
CLOCK SOURCE
(DERIVED FROM SYSTEM CLOCK)
REFERENCE TIME FOR
USER TIME STAMP
PROCESSOR 0
EVENT x TIME
80 BITS
(40.40, INTEGER.FRACTIONAL)
RELATIVE TO THE CORRESPONDING
REFERENCE TIME OF THE PROCESSOR
USER TIME
STAMP
SOURCE 0
TIME
STAMPS
TIME
STAMPS
TIME
STAMPS
TIME
STAMPS
8
USER TIME STAMP x
MISSED COUNT
REFERENCE TIME FOR
USER TIME STAMP
PROCESSOR 1
80
FEEDBACK
TDCS
AUXILIARY
NCOS
TIME
STAMPS
AUXILIARY
TDCS
USER TIME
STAMP
PROCESSOR 1
TEXT
= BIT(S) IN THE REGISTER MAP
TIMEBASE SOURCE 0
01
TIMEBASE SOURCE 1
01
USER TIME STAMP x
LOW RESOLUTION
USER TIME
STAMP
SOURCE 1
TIME STAMP
SOURCE 0
TIME STAMP
SOURCE 1
ELAPSED
TIME 0
ELAPSED
TIME 1
ELAPSED TIME 1
ELAPSED TIME 0
ELAPSED TIME 1
ELAPSED TIME 0
Figure 88. User Time Stamp Block Diagram
INTERPRETING USER TIME STAMPS
The user time stamps appearing in the Event x time bit fields
comprise 80-bit words with the least significant bit weighted as
2−40. The units associated with a time stamp result depend on
the auxiliary NCO assigned to the user time stamp processor
associated with the particular Event x time bit field. Specifically,
the 80-bit user time stamp consists of a 40-bit integer part (the
40 leftmost bits) and a 40-bit fractional part (the 40 rightmost
bits), as shown in Figure 89. Each count of the integer part
represents one period of the assigned auxiliary NCO. The 40
fractional bits represent the fractional part of one period with a
resolution of 2−40.
0
79
40
39
...
...
80-BIT USER TIME STAMP
2–40
INTEGER PART
FRACTIONAL PART
DECIMAL
POINT
Figure 89. User Time Stamp
Assume the user time stamp value is the 80-bit hexadecimal
number, 0x 0000 0000 B10E 04F0 07C1. Its decimal equivalent
is 194,673,770,497,985. Because the scale of the fractional part
is 2−40, the time stamp value (rounded to 10 decimal places) is
Time stamp value = 194,673,770,497,985 × 2−40
= 177.05476284207634307676926255226
= 177.0547628421
However, the value of the user time stamp is relative to the
programmed period of the auxiliary NCO associated with the
user time stamp processor. That is, the integer part of the user
time stamp constitutes the programmed period of the auxiliary
NCO associated with the user time stamp processor.
Suppose the user programs the frequency of the auxiliary NCO
serving as the reference clock for the user time stamp processor
with 10052.630025 Hz (the corresponding period is
99.476455167760936272992897696939 μs). Multiply the user
time stamp from the previous example by the period of the
auxiliary NCO to obtain a time stamp value of 0.0176127802
sec (rounded to 10 decimal places).
The user time stamp value in this example is approximately
17.6 ms. However, be aware that user time stamps have a
resolution of approximately 1 ps; thus, round user time stamp
results to 1 ps resolution because digits representing
subpicosecond values are not meaningful.
Because the value of a user time stamp reflects time relative to
the most recently completed auxiliary NCO period, it is not
useful as a time clock. Auxiliary NCO rollover events have little
correlation with the timing of external events. The usefulness of
time stamps becomes apparent, however, when they occur in a
series. In a series, the difference between successive time stamps
constitutes the period underlying the source of the time stamps.
For example, if one of the time stamp processors has the REFA
TDC as its time stamp source, the difference between successive
time stamps indicates the period of the signal at the input of the
REFA TDC.



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