SMSC LAN9420 - Manual (Page 87)

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
SMSC LAN9420/LAN9420i 87 Revision 1.22 (09-25-08)
DATASHEET
4.2.1 ID and Revision (ID_REV)
This register contains the device ID and block revision.
Note 4.1 Default value is dependent on device revision.
Offset: 00C0h Size: 32 bits
BITS DESCRIPTION TYPE DEFAULT
31:16 Chip ID.
This 16-bit field is used to identify the device model. RO 9420h
15:0 Block Revision.
This 16-bit field is used to identify the revision of the Ethernet Subsystem. RO Note 4.1