ST802RT1B データシートの表示（PDF） - STMicroelectronics

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ST802RT1B

10/100 real-time Ethernet 3.3 V transceiver

STMicroelectronics 

ST802RT1A, ST802RT1B

Registers and descriptors description

Table 11. RN01 [0d01, 0x01]: Status register

Bit

Bit name

Description

Default

RW

type

Type

15

100BASE-T4 0 -> PHY not able to perform 100BASE-T4

ABILITY Fixed to 0

0 RO P

14

100BASE-X 1 -> PHY able to perform full-duplex 100BASE-X

Full Duplex Fixed to 1, internally not used

13

100BASE-X 1 -> PHY able to perform half-duplex 100BASE-X

Half Duplex Fixed to 1

1 RO P

1 RO P

12

10BASE-T 1 -> PHY able to perform full-duplex 10BASE-T

Full Duplex Fixed to 1, internally not used

1 RO P

11

10BASE-T 1 -> PHY able to perform half-duplex 10BASE-T

Half Duplex Fixed to 1

1 RO P

10 RESERVED Not used

0

RO P

9 RESERVED Not used

0

RO P

8 RESERVED Not used

0

RO P

7 RESERVED Not used

6

MF Preamble

Suppression

1 -> Accepts management frames with preamble suppressed

0 -> Doesn't accept management frames without preamble

Controlled by RN14 [1].

0

RO P

1 RO -

5

Auto-

Negotiation

complete

1 -> Auto-negotiation process completed, registers 4, 5, 6 are now

valid

0 -> Auto-negotiation process not completed

Active only if auto-negotiation is enabled, else 0

0

RO -

1 -> Remote fault condition detected

0 -> No remote fault condition detected

Set when link partner signals a remote fault condition (RN05 - bit

4 Remote Fault 13) or a far-end-fault indicator was asserted. Latched, so the

0 RO LH

occurrence of a remote fault causes the remote fault bit to become

set and remain set until it is cleared (by register read, if no more

fault is present).

3

Auto-

Negotiation

Ability

1 -> PHY is able to perform auto-negotiation

Fixed to 1

1 RO P

1 -> Link is valid and established (either for 10 and 100 Mb/s)

2

Link Status

0 -> Link is down

This bit is cleared at link failure and set after a register read if a

valid link is established

1 -> Jabber condition detected: transmission exceeded max

number of bytes

0 -> No jabber condition detected.

1 Jabber Detect

Set at jabber condition detection, cleared only after register read

(if no more jabber condition is present).

Working on 10Base-T only. Fixed to 0 in 100Base-X modes

0 RO LL

0 RO LH

0

Extended 1 -> extended register capabilities

Capability Fixed to 1

1 RO P

Doc ID 17049 Rev 1

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