DP83848JSQ datasheet(44/80 Pages) TI

44 / 80 page

www.national.com

The PHY Identifier Registers #1 and #2 together form a unique identifier for the DP83848J. The Identifier consists of a

concatenation of the Organizationally Unique Identifier (OUI), the vendor's model number and the model revision num-

ber. A PHY may return a value of zero in each of the 32 bits of the PHY Identifier if desired. The PHY Identifier is intended

to support network management. National's IEEE assigned OUI is 080017h.

7.1.3 PHY Identifier Register #1 (PHYIDR1)

7.1.4 PHY Identifier Register #2 (PHYIDR2)

7.1.5 Auto-Negotiation Advertisement Register (ANAR)

This register contains the advertised abilities of this device as they will be transmitted to its link partner during Auto-Nego-

tiation. Any writes to this register prior to completion of Auto-Negotiation (as indicated in the Basic Mode Status Register

(address 0x01) Auto-Negotiation complete bit, BMSR[5] ) should be followed by a renegotiation. This will ensure that the

new values are properly used in the Auto-Negotiation.

Table 14. PHY Identifier Register #1 (PHYIDR1), address 0x02

Bit

Bit Name

Default

Description

15:0

OUI_MSB

<0010 0000 0000

0000>, RO/P

OUI Most Significant Bits: Bits 3 to 18 of the OUI (080017h) are

stored in bits 15 to 0 of this register. The most significant two bits

of the OUI are ignored (the IEEE standard refers to these as bits 1

and 2).

Table 15. PHY Identifier Register #2 (PHYIDR2), address 0x03

Bit

Bit Name

Default

Description

15:10

OUI_LSB

<0101 11>, RO/P OUI Least Significant Bits:

Bits 19 to 24 of the OUI (080017h) are mapped from bits 15 to 10

of this register respectively.

9:4

VNDR_MDL

<00 1001>, RO/P Vendor Model Number:

The six bits of vendor model number are mapped from bits 9 to 4

(most significant bit to bit 9).

3:0

MDL_REV

<0000>, RO/P

Model Revision Number:

Four bits of the vendor model revision number are mapped from

bits 3 to 0 (most significant bit to bit 3). This field will be incremented

for all major device changes.

Table 16. Negotiation Advertisement Register (ANAR), address 0x04

Bit

Bit Name

Default

Description

0, RW

Next Page Indication:

0 = Next Page Transfer not desired.

1 = Next Page Transfer desired.

RESERVED

0, RO/P

RESERVED by IEEE: Writes ignored, Read as 0.

0, RW

Remote Fault:

1 = Advertises that this device has detected a Remote Fault.

0 = No Remote Fault detected.

RESERVED

0, RW

RESERVED for Future IEEE use: Write as 0, Read as 0

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