dp83630sqx National Semiconductor Corporation, dp83630sqx Datasheet - Page 96

• Manufacturer Part Number: dp83630sqx
• Description: Precision Phyter - Ieee 1588 Precision Time Protocol Transceiver
• Manufacturer: National Semiconductor Corporation

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15:12
Bit
7:0
11
10
14.6.9 PTP Receive Configuration Register 3 (PTP_RXCFG3), Page 5
This register provides extended configuration for IEEE 1588 Receive Timestamp operation.
9
8
PTP_DOMAIN
TS_APPEND
TS_MIN_IFG
TS_INSERT
ACC_CRC
ACC_UDP
Bit Name
TABLE 71. PTP Receive Configuration Register 3 (PTP_RXCFG3), address 0x1C
0000 0000, RW
1100, RW
Default
0, RW
0, RW
0, RW
0, RW
Minimum Inter-frame Gap:
When a Timestamp is appended to a PTP Message, the length of the packet may
get extended. This could reduce the Inter-frame Gap (IFG) between packets by
as much as 8 byte times (640 ns at 100 Mb). This field sets a minimum on the
IFG between packets in number of byte times. If the IFG is set larger than the
actual IFG, preamble bytes of the subsequent packet will get dropped. This value
should be set to the lowest possible value that the attached MAC can support.
Record Timestamp if UDP Checksum Error:
By default, Timestamps will be discarded for packets with UDP Checksum errors.
If this bit is set, then the Timestamp will be made available in the normal manner.
Record Timestamp if CRC Error:
By default, Timestamps will be discarded for packets with CRC errors. If this bit
is set, then the Timestamp will be made available in the normal manner.
Append Timestamp for L2:
For Layer 2 encapsulated PTP messages, if this bit is set, always append the
Timestamp to end of the PTP message rather than inserted in unused message
fields. This bit will be ignored if TS_INSERT is 0.
Enable Timestamp Insertion:
Enables Timestamp insertion into a packet containing a PTP Event Message. If
this bit is set, the Timestamp will not be available through the PTP Receive
Timestamp Register.
PTP Domain:
Value of the PTP Message domainNumber field. If PTP_RXCFG0:DOMAIN_EN
is set to 1, the Receive Timestamp unit will only capture a Timestamp if the
domainNumber in the receive PTP message matches the value in this field. If the
DOMAIN_EN bit is set to 0, the domainNumber field will be ignored.
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Description