DP83847 datasheet(32/60 Pages) NSC

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The PHY Identifier Registers #1 and #2 together form a unique identifier for the DP83847. 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.

Table 9. 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 10. PHY Identifier Register #2 (PHYIDR2), address 0x03

Bit

Bit Name

Default

Description

15:10

OUI_LSB

<01 0111>, RO/P OUI Least Significant Bits:

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

this register respectively.

9:4

VNDR_MDL

<00 0011>, RO/P Vendor Model Number:

The six bits of vendor model number are mapped to 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 to bits

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

all major device changes.

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