ST802RT1A 데이터 시트보기 (PDF) - STMicroelectronics

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ST802RT1A

10/100 real-time Ethernet 3.3 V transceiver

STMicroelectronics 

ST802RT1A, ST802RT1B

Registers and descriptors description

Table 24. RN18 [0d24, 0x18]: Auxiliary control register

Bit

Bit name

Description

15

Jabber disable

1 -> Disables jabber detection (10BaseT)

0 -> Normal operation

14 RESERVED --

13:8 RESERVED --

7:5 RESERVED --

4

MDIO Power 1 -> Stops MDC clock when MDIO interface is idle

Saving

0 -> Normal operation

3:0 RESERVED --

Default

RW

Type

Type

0

RW

-

0

RW

-

000000b RO

P

001b

RW

-

0

RW

-

0111b

RO

-

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

Bit

Bit name

Description

Default

RW

Type

Type

1 -> Auto-negotiation process completed

15

Auto-Negotiation 0 -> Auto-negotiation process not completed

complete

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

Same as RN01[5]

0

RO -

14

Auto-negotiation 1 -> Auto-negotiation completed ack state

ack

0 -> Auto-negotiation did not complete ack state

0

RO LH

13

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

detect

0 -> Acknowledge match not completed

0

12

LP auto-

1 -> Auto-negotiation in ability detect state

negotiation ability 0 -> Auto-negotiation not in ability detect state

0

RO LH

RO LH

1 -> Pause is enabled

11

Auto-negotiation 0 -> Pause is disabled

pause

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

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

0

RO -

Auto-negotiation highest common denominator:

000 -> No common denominator

10:8

Auto-negotiation 001 -> 10Base-T half-duplex

HCD

010 -> 10Base-T full-duplex

011 -> 100Base-TX half-duplex

101 -> 100Base-TX full-duplex

000b RO -

Doc ID 17049 Rev 1

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