TNETE2101

10BASE-T/100BASE-TX/100BASE-FX

LOW-POWER PHYSICAL-LAYER INTERFACE

SPWS032D – JANUARY 1997 – REVISED MARCH 1999

26

POST OFFICE BOX 655303

unformatted-page encoding (LPMP = 0)

BIT

15

14

13

12

11

10

987654321

BIT

0

LPNP

ACK

LPMP

ACK2

T

Unformatted Code Field

Figure 14. Unformatted-Page Encoding Register

Table 12. Unformatted-Page Encoding Register Bit Functions

BIT

FUNCTION

NAME

NO.

FUNCTION

LPNP

15

Link partner next page. When LPNP is set to 1, the link partner is indicating that it wishes to exchange

an extra next page. Refer to the description of NP in register AN_adv for more information on next-page

exchange.

ACK

14

Acknowledge. Reserved for internal use of the autonegotiation process. Ignore during read.

LPMP

13

Link partner message page. When LPMP is cleared to 0, register AN_lpa contains an unformatted page.

ACK2

12

Acknowledge 2. Reserved for internal use of the autonegotiation process. Ignore during read.

T

11

Toggle. Reserved for internal use of the autonegotiation process. Ignore during read.

Unformatted Code Field

10–0

Unformatted code. 11-bit user code. The format of this code is determined by the message code (see

Table 11).

autonegotiation expansion register – AN_exp at 0x06

BIT

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

BIT

0

Reserved

PDFAULT

LPNPABLE

1

PAGERX

LPANABLE

Figure 15. Autonegotiation Expansion Register

Table 13. Autonegotiation Expansion-Register Bit Functions

BIT

FUNCTION

NAME

NO.

FUNCTION

Reserved

15–5

Reserved. Read and write as 0.

PDFAULT

4

Parallel detection fault. The PDFAULT bit is set to 1 during autonegotiation if the PHY detects a valid 10BASE-T or

100BASE-TX link that fails within 500–1000 ms or if both the 10BASE-T and 100BASE-TX link monitors report a good

link. PDFAULT is latched until this register is read, then it is cleared to 0 (default).

LPNPABLE

3

Link-partner next-page able. When LPNPABLE is set to 1, the link partner is indicating that it is implementing the

autonegotiation next-page ability. The default value of LPNPABLE is 0.

1

2

Next-page able. This PHY supports autonegotiation next-page exchange.

PAGERX

1

Page received. The PAGERX bit is set to 1 when a new link code word has been received and stored in the AN_lpa

register. PAGERX is latched until this register is read, then it is cleared to 0 (default).

LPANABLE

0

Link-partner autonegotiation enable. When LPANABLE is set to 1, the PHY has received link code word(s) from the

link partner during autonegotiation. The value of LPANABLE is retained after autonegotiation completes, and is

re-evaluated only during a subsequent renegotiation (whether caused by a LINK FAIL condition or a forced restart)

or PHY reset. The default value of LPANABLE is 0.