RM0090: Reference manual - STMicroelectronics

Ethernet (ETH): media access control (MAC) with DMA controller RM0090
Bits 31:19 Reserved, must be kept at reset value.
Bit 18 TSPFFMAE: Time stamp PTP frame filtering MAC address enable
When set, this bit uses the MAC address (except for MAC address 0) to filter the PTP frames
when PTP is sent directly over Ethernet.
Bits 17:16 TSCNT: Time stamp clock node type
The following are the available types of clock node:
00: Ordinary clock
01: Boundary clock
10: End-to-end transparent clock
11: Peer-to-peer transparent clock
Bit 15 TSSMRME: Time stamp snapshot for message relevant to master enable
When this bit is set, the snapshot is taken for messages relevant to the master node only.
When this bit is cleared the snapshot is taken for messages relevant to the slave node only.
This is valid only for the ordinary clock and boundary clock nodes.
Bit 14 TSSEME: Time stamp snapshot for event message enable
When this bit is set, the time stamp snapshot is taken for event messages only (SYNC,
Delay_Req, Pdelay_Req or Pdelay_Resp). When this bit is cleared the snapshot is taken for
all other messages except for Announce, Management and Signaling.
Bit 13 TSSIPV4FE: Time stamp snapshot for IPv4 frames enable
When this bit is set, the time stamp snapshot is taken for IPv4 frames.
Bit 12 TSSIPV6FE: Time stamp snapshot for IPv6 frames enable
When this bit is set, the time stamp snapshot is taken for IPv6 frames.
Bit 11 TSSPTPOEFE: Time stamp snapshot for PTP over ethernet frames enable
When this bit is set, the time stamp snapshot is taken for frames which have PTP messages
in Ethernet frames (PTP over Ethernet) also. By default snapshots are taken for UDP-
IPEthernet PTP packets.
Bit 10 TSPTPPSV2E: Time stamp PTP packet snooping for version2 format enable
When this bit is set, the PTP packets are snooped using the version 2 format. When the bit is
cleared, the PTP packets are snooped using the version 1 format.
Note: IEEE 1588 Version 1 and Version 2 formats as indicated in IEEE standard 1588-2008
(Revision of IEEE STD. 1588-2002).
Bit 9 TSSSR: Time stamp subsecond rollover: digital or binary rollover control
When this bit is set, the Time stamp low register rolls over when the subsecond counter
reaches the value 0x3B9A C9FF (999 999 999 in decimal), and increments the Time Stamp
(high) seconds.
When this bit is cleared, the rollover value of the subsecond register reaches 0x7FFF FFFF.
The subsecond increment has to be programmed correctly depending on the PTP’s
reference clock frequency and this bit value.
Bit 8 TSSARFE: Time stamp snapshot for all received frames enable
When this bit is set, the time stamp snapshot is enabled for all frames received by the core.
Bits 7:6 Reserved, must be kept at reset value.
Bit 5 TSARU: Time stamp addend register update
When this bit is set, the Time stamp addend register’s contents are updated to the PTP block
for fine correction. This bit is cleared when the update is complete. This register bit must be
read as zero before you can set it.
993/1416 Doc ID 018909 Rev 3