Datasheet

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DP83849I
The PHY Identifier Registers #1 and #2 together form a unique identifier for the DP83849I. 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 01h) 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 22. PHY Identifier Register #1 (PHYIDR1), address 02h
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 23. PHY Identifier Register #2 (PHYIDR2), address 03h
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 1010>, 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 <0010>, 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 24. Negotiation Advertisement Register (ANAR), address 04h
Bit Bit Name Default Description
15 NP 0, RW Next Page Indication:
0 = Next Page Transfer not desired.
1 = Next Page Transfer desired.
14 RESERVED 0, RO/P RESERVED by IEEE: Writes ignored, Read as 0.
13 RF 0, RW Remote Fault:
1 = Advertises that this device has detected a Remote Fault.
0 = No Remote Fault detected.
12 RESERVED 0, RW RESERVED for Future IEEE use: Write as 0, Read as 0