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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
901 of 1441
NXP Semiconductors
UM10503
Chapter 28: LPC43xx/LPC43Sxx Ethernet
The extended status written is as shown in
. The extended status is written only
when there is status related to IPC or timestamp available. The availability of extended
status is indicated by bit-0 of RDES0. This status is available only when Advance
Timestamp or IPC Full Offload feature is selected.
RDES6 and RDES7 contain the snapshot of the time-stamp. The availability of the
snapshot of the time-stamp in RDES6 and RDES7 is indicated by bit-7 in the RDES0
descriptor. The contents of RDES6 and RDES7 are identified in
and
.
Table 664. Receive descriptor fields 4 (RDES4)
Bit
Symbol
Description
2:0
-
Reserved
3
-
Reserved
4
-
Reserved
5
-
-
6
IPV4
IPv4 Packet Received
When set, this bit indicates that the received packet is an IPv4 packet.
7
IPV6
IPv6 Packet Received
When set, this bit indicates that the received packet is an IPv6 packet.
11:8
MT
Message Type These bits are encoded to give the type of the message received.
• 0000: No PTP message received
• 0001: SYNC (all clock types)
• 0010: Follow_Up (all clock types)
• 0011: Delay_Req (all clock types)
• 0100: Delay_Resp (all clock types)
• 0101: Pdelay_Req (in peer-to-peer transparent clock)
• 0110: Pdelay_Resp (in peer-to-peer transparent clock)
• 0111: Pdelay_Resp_Follow_Up (in peer-to-peer transparent clock)
• 1000: Announce
• 1001: Management
• 1010: Signaling
• 1011-1110: Reserved
• 1111: PTP packet with Reserved message type
These bits are used for the Advance Timestamp feature.
12
PTPTYPE
PTP Frame Type
When set, this bit that the PTP message is sent directly over Ethernet. When this bit is not set
and the message type is non-zero, it indicates that the PTP message is sent over UDP-IPv4 or
UDP-IPv6. The information on IPv4 or IPv6 can be obtained from bits 6 and 7.
13
PTPVERSION
PTP Version
When set, indicates that the received PTP message is having the IEEE 1588 version 2 format.
When reset, it has the version 1 format. This is valid only if the message type is non-zero.
31:14
-
Reserved.
Table 665. Receive descriptor fields 6 (RDES6)
Bit
Symbol
Description
31:0
RTSL
Receive Frame Timestamp Low
This field is updated by DMA with the least significant 32 bits of the timestamp
captured for the corresponding receive frame. This field is updated by DMA
only for the last descriptor of the receive frame which is indicated by Last
Descriptor status bit (RDES0[8]).