dp83846a National Semiconductor Corporation, dp83846a Datasheet - Page 32

• Manufacturer Part Number: dp83846a
• Description: Dsphyter ? Single 10/100 Ethernet Transceiver
• Manufacturer: National Semiconductor Corporation

The PHY Identifier Registers #1 and #2 together form a unique identifier for the DP83846A. 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.
15:10
15:0
9:4
3:0
Bit
Bit
VNDR_MDL
MDL_REV
OUI_MSB
Bit Name
Bit Name
OUI_LSB
Table 10. PHY Identifier Register #2 (PHYIDR2), address 0x03
Table 9. PHY Identifier Register #1 (PHYIDR1), address 0x02
<0010 0000 0000
0000>, RO/P
<01 0111>, RO/P OUI Least Significant Bits:
<00 0010>, RO/P Vendor Model Number:
<0000>, RO/P
Default
Default
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).
Bits 19 to 24 of the OUI (080017h) are mapped to bits 15 to 10 of
this register respectively.
The six bits of vendor model number are mapped to bits 9 to 4
(most significant bit to bit 9).
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.
32
Description
Description
www.national.com