ST802RT1AFR datasheet(26/58 Pages) STMICROELECTRONICS

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Registers and descriptors description

ST802RT1A, ST802RT1B

26/58

Doc ID 17049 Rev 1

Next page: Indicates whether this is the last next page to be transmitted.

Msg page: Differentiates a message page from an unformatted page.

Ack2: Indicates that a device has the ability to comply with the message.

Toggle: Used by the arbitration function to ensure synchronization with the link partner

during next page exchange.

Message code field: An eleven-bit wide field, encoding 2048 possible messages.

Unformatted code field: An 11-bit wide field, which may contain an arbitrary value.

Table 17.

RN07 [0d07, 0x07]: Auto-negotiation next page transmit register

Bit

Bit name

Description

Default

type

Type

1 -> additional next page(s) will follow

0 -> last page

0RW

RESERVED

Message Page

1 -> Message page transmitting

0 -> Unformatted page transmitting

1RW

Acknowledge 2

1 -> Local device will comply with message received

0 -> Local device cannot comply with message

0RW

Toggle

1 -> Previous transmitted LCW toggle was 0

0 -> Previous transmitted LCW toggle was 1

Updated by auto-negotiation state machines

0RO

10:0

Message /

Unformatted

Code Field

It can be a message code (annex 28C, IEEE 802.3u) or

an unformatted code, according to value set in RN07[13]

00000000

001b

Table 18.

RN08 [0d08, 0x08]: Auto-negotiation link partner received next page register

Bit

Bit name

Description

Default

type

Type

1 -> LP desires next page transfer

0 -> LP has no more Next Pages

0RO

Acknowledge

1 -> LP acknowledges reception of the ability data word

0 -> Not acknowledged

0RO

Message Page

1 -> LP message page transmitting

0 -> LP unformatted page transmitting

0RO

Acknowledge 2

1 -> LP will comply with message received

0 -> LP cannot comply with message

0RO

Toggle

1 -> Previous transmitted LP LCW toggle was 0

0 -> Previous transmitted LP LCW toggle was 1

0RO

10:0

Message /

Unformatted Code

Field

It can be a message code (annex 28C, IEEE 802.3u) or

an unformatted code, according to value set in RN08[13]

0000000

0000b

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