Altera Low Latency Ethernet 10G MAC - Manual (Page 102)

Signal Direction Width Description
tx_egress_timestamp_64b_
fingerprint[]
Out n n = value of the Timestamp
fingerprint width parameter.
The fingerprint of the transmit frame,
which is received on
tx_egress_
timestamp_request_data[]
. This
fingerprint specifies the transmit
frame the egress timestamp on
tx_
egress_timestamp_64b_data[]
signal is for.
tx_time_of_day_96b_10g_data
(for 10 Gbps)
In 96
Carries the time of day (ToD) from
an external ToD module to the MAC
IP core in the following format:
• Bits 48 to 95: 48-bit seconds field
• Bits 16 to 47: 32-bit nanoseconds
field
• Bits 0 to 15: 16-bit fractional
nanoseconds field
This is required for noting the
timestamp ToD which is of 80-bit,
consisting of seconds and nanosec‐
onds, in the respective field of the
PTP packet. The remaining 16-bit
fractional nanoseconds value, if used,
is for updating the CF of the PTP
packet.
tx_time_of_day_96b_1g_data
(for 10 Mbps, 100 Mbps, and 1 Gbps)
tx_time_of_day_64b_10g_data
(for 10 Gbps)
In 64
Carries the ToD from an external
ToD module to the MAC IP core in
the following format:
• Bits 16 to 63: 48-bit nanoseconds
field
• Bits 0 to 15: 16-bit fractional
nanoseconds field
The 64-bit timestamp is required to
update the CF in the PTP header.
Updating the CF is fundamental to
the transparent clock operation.
tx_time_of_day_64b_1g_data
(for 10 Mbps, 100 Mbps, and 1 Gbps)
5-20 IEEE 1588v2 Egress Transmit Signals
UG-01144
2014.12.15
Altera Corporation Interface Signals for LL Ethernet 10G MAC
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