PDP83TG720SWCSTQ1 datasheet(172/199 Pages) TI

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7.6.2.114 OAM_TRANSMIT Register (Address = 0x3904) [reset = 0x0]

OAM_TRANSMIT is shown in Table 7-137.

Return to the Summary Table.

Table 7-137. OAM_TRANSMIT Register Field Descriptions

Bit

Field

Type

Reset

Description

mr_tx_valid

R/WMC,0

1b0

This bit is used to indicate message data in registers 3.2308.11:8,

3.2309, 3.2310, 3.2311, and 3.2312 are valid and ready to be loaded.

This bit shall self-clear when registers are loaded by the state

machine. 1 = Message data in registers are valid 0 = Message data

in registers are not valid Note - 0x3 added in [15:12] to differentiate

1b0 = Message data in registers are not valid

1b1 = Message data in registers are valid

mr_tx_toggle

1b0

Toggle value to be transmitted with message. This bit is set by the

state machine and cannot be overridden by the user. Note - 0x3

added in [15:12] to differentiate

mr_tx_received

1b0

This bit shall self clear on read. 1 = 1000BASE-T1 OAM message

received by link partner 0 = 1000BASE-T1 OAM message not

received by link partner Note - 0x3 added in [15:12] to differentiate

1b0 = 1000BASE-T1 OAM message not received by link partner

1b1 = 1000BASE-T1 OAM message received by link partner

mr_tx_received_toggle

1b0

Toggle value of message that was received by link partner Note - 0x3

added in [15:12] to differentiate

11-8

mr_tx_message_num

R/W

4b0000

User-defined message number to send Note - 0x3 added in [15:12]

to differentiate

7-4

RESERVED

4b0000

Reserved

mr_rx_ping

1b0

Received PingTx value from latest good 1000BASE-T1 OAM frame

received Note - 0x3 added in [15:12] to differentiate

mr_tx_ping

R/W

1b0

Ping value to send to link partner Note - 0x3 added in [15:12] to

differentiate

1-0

mr_tx_snr

2b00

00 = PHY link is failing and will drop link and relink within 2 ms to 4

ms after the end of the current 1000BASE-T1 OAM frame. 01 = LPI

refresh is insufficient to maintain PHY SNR. Request link partner to

exit LPI and send idles (used only when EEE is enabled). 10 = PHY

SNR is marginal. 11 = PHY SNR is good. Note - 0x3 added in [15:12]

to differentiate

2b00 = PHY link is failing and will drop link and relink within 2 ms to 4

ms after the end of the current 1000BASE-T1 OAM frame.

2b01 = LPI refresh is insufficient to maintain PHY SNR. Request link

partner to exit LPI and send idles (used only when EEE is enabled).

2b10 = PHY SNR is marginal.

2b11 = PHY SNR is good.

DP83TG720S-Q1

SNLS604 – SEPTEMBER 2020

www.ti.com

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