Datasheet

DP83630
SNLS335B –OCTOBER 2010–REVISED APRIL 2013 www.ti.com
Table 10-54. PTP Transmit Configuration Register 0 (PTP_TXCFG0), address 0x16 (continued)
Bit Bit Name Default Description
9 CHK_1STEP 0, RW Enable UDP Checksum correction for One-Step Operation:
Enables correction of the UDP checksum for messages which include insertion of
the timestamp. The checksum is corrected by modifying the last two bytes of the
UDP data. The last two bytes must be transmitted by the MAC as 0’s. This control
must be set for proper IPv6/UDP One-Step operation. This control will have no
effect for Layer2 Ethernet messages.
8 IP1588_EN 0, RW Enable IEEE 1588 defined IP address filter:
Enable filtering of UDP/IP Event messages using the IANA assigned IP Destination
addresses. If this bit is set to 1, packets with IP Destination addresses which do not
match the IANA assigned addresses will not be timestamped. This field affects
operation for both IPv4 and IPv6. If this field is set to 0, IP destination addresses will
be ignored.
7 TX_L2_EN 0, RW Layer2 Timestamp Enable:
Enables detection of IEEE 802.3/Ethernet encapsulated PTP event messages.
6 TX_IPV6_EN 0, RW IPv6 Timestamp Enable:
Enables detection of UDP/IPv6 encapsulated PTP event messages.
5 TX_IPV4_EN 0, RW IPv4 Timestamp Enable:
Enables detection of UDP/IPv4 encapsulated PTP event messages.
4:1 TX_PTP_VER 0 000, RW PTP Version:
Enable Timestamp capture for a specific version of the IEEE 1588 specification. This
field may be programmed to any value between 1 and 15 and allows support for
future versions of the IEEE 1588 specification. A value of 0 will disable version
checking (not recommended).
0 TX_TS_EN 0, RW Transmit Timestamp Enable:
Enable Timestamp capture for Transmit.
10.6.4 PTP Transmit Configuration Register 1 (PTP_TXCFG1), Page 5
This register provides data and mask fields to filter the first byte in a PTP Message. This function will be
disabled if all the mask bits are set to 0.
Table 10-55. PTP Transmit Configuration Register 1 (PTP_TXCFG1), address 0x17
Bit Bit Name Default Description
15:8 BYTE0_MASK 0000 0000, RW Byte0 Data:
Bit mask to be used for matching Byte0 of the PTP Message. A one in any bit
enables matching for the associated data bit. If no matching is required, all bits of
the mask should be set to 0.
7:0 BYTE0_DATA 0000 0000, RW Byte0 Mask:
Data to be used for matching Byte0 of the PTP Message.
120 Register Block Copyright © 2010–2013, Texas Instruments Incorporated
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