ST802RT1AFR datasheet(31/58 Pages) STMICROELECTRONICS

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ST802RT1A, ST802RT1B

Registers and descriptors description

Doc ID 17049 Rev 1

31/58

Jabber disable: 10BASE-T operation only. Bit 15 of the auxiliary control register allows the

user to disable the jabber detect function, defined in the IEEE standard. This function shuts

off the transmitter when a transmission request has exceeded a maximum time limit. By

writing a “1” to bit 15 of the auxiliary control register, the jabber detect function is disabled.

Writing a “0” to this bit or resetting the chip restores normal operation. Reading this bit

returns the value of jabber detect disable.

MDIO power saving: to reduce power consumption set this bit to '1'

Table 24.

RN18 [0d24, 0x18]: Auxiliary control register

Bit

Bit name

Description

Default

Type

Jabber disable

1 -> Disables jabber detection (10BaseT)

0 -> Normal operation

0RW

RESERVED

13:8

RESERVED

000000b

7:5

RESERVED

001b

MDIO Power

Saving

1 -> Stops MDC clock when MDIO interface is idle

0 -> Normal operation

0RW

3:0

RESERVED

0111b

Table 25.

RN19 [0d25, 0x19]: Auxiliary status register

Bit

Bit name

Description

Default

Type

Auto-Negotiation

complete

1 -> Auto-negotiation process completed

0 -> Auto-negotiation process not completed

Active only if auto-negotiation is enabled, else 0.

Same as RN01[5]

0RO

Auto-negotiation

ack

1 -> Auto-negotiation completed ack state

0 -> Auto-negotiation did not complete ack state

0RO

Auto-negotiation

detect

1 -> Auto-negotiation entered ack state (ack match completed)

0 -> Acknowledge match not completed

0RO

LP auto-

negotiation ability

1 -> Auto-negotiation in ability detect state

0 -> Auto-negotiation not in ability detect state

0RO

Auto-negotiation

pause

1 -> Pause is enabled

0 -> Pause is disabled

Pause is active only after auto-negotiation completion, if both

devices support symmetric pause (RN04[10], RN05[10])

0RO

10:8

Auto-negotiation

HCD

Auto-negotiation highest common denominator:

000 -> No common denominator

001 -> 10Base-T half-duplex

010 -> 10Base-T full-duplex

011 -> 100Base-TX half-duplex

101 -> 100Base-TX full-duplex

000b

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