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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Revision 1.0 (05-28-09) 36 SMSC LAN8720/LAN8720i
DATASHEET
Chapter 5 SMI Register Mapping
Table 5.1 Control Register: Register 0 (Basic)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reset Loopback Speed
Select
A/N
Enable
Power
Down
Isolate Restart A/N Duplex
Mode
Collision
Test
Reserved
Table 5.2 Status Register: Register 1 (Basic)
15 14 13 12 11 109876 5 4 3 2 1 0
100Base
-T4
100Base
-TX
Full
Duplex
100Base
-TX
Half
Duplex
10Base-
T
Full
Duplex
10Base-
T
Half
Duplex
Reserved A/N
Complete
Remote
Fault
A/N
Ability
Link
Status
Jabber
Detect
Extended
Capability
Table 5.3 PHY ID 1 Register: Register 2 (Extended)
1514131211109876543210
PHY ID Number (Bits 3-18 of the Organizationally Unique Identifier - OUI)
Table 5.4 PHY ID 2 Register: Register 3 (Extended)
1514131211109876543210
PHY ID Number (Bits 19-24 of the Organizationally Unique
Identifier - OUI)
Manufacturer Model Number Manufacturer Revision Number