Ptp Signals - Xilinx LogiCORE IP Ethernet AVB Endpoint v2.4 User Manual

Chapter 5: Core Architecture

PTP Signals

Table 5-11
Protocol Blocks."
application. For example, the 1722 Packet Managers, as illustrated in
the following:
•
•
Table 5-11: PTP Signals
56
defines the signals which are output from the core by the
These signals are provided for reference only and may be used by an
clk8k: this marks the class measurement interval to be used for traffic shaping for SR
class A AV traffic.
rtc_nanosec_field and rtc_sec_field: used in the 1722 presentation time
stamp logic.
Signal
rtc_nanosec_field[31:0]
rtc_sec_field[47:0]
clk8k
rtc_nanosec_field_1722[31:0]
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Direction
Output This is the synchronized nanoseconds field
from the "RTC."
Output This is the synchronized seconds field
from the "RTC."
Output This is an 8KHz clock which is derived
from, and synchronized in frequency, to
the "RTC."
Output The IEEE1722 specification contains a
different format for the "RTC,"provided
here as an extra port. This is derived and is
in sync with the IEEE802.1 AS RTC. If
desired, this port can be used as the RTC
reference for 1722 Packet Manager blocks,
as illustrated in
"IEEE1722 Real Time Clock Format,"
page 81.
Ethernet AVB Endpoint User Guide
"Precise Timing
Figure 3-2, require
Description
Figure 3-2
. See also
UG492 September 21, 2010