LAN9313 Datasheet, PDF (207/398 Pages) SMSC Corporation – Three Port 10/100 Managed Ethernet Switch with MII

Three Port 10/100 Managed Ethernet Switch with MII
Datasheet
13.1.6 PHY Management Interface (PMI)
The PMI registers are used to indirectly access the PHY registers. Refer to Section 13.2, "Ethernet
PHY Control and Status Registers," on page 231 for additional information on the PHY registers. Refer
to Section 9.3, "PHY Management Interface (PMI)," on page 127 for information on the PMI.
Note: The Virtual PHY registers are NOT accessible via these registers.
13.1.6.1 PHY Management Interface Data Register (PMI_DATA)
Offset:
0A4h
Size:
32 bits
This register is used in conjunction with the PHY Management Interface Access Register
(PMI_ACCESS) to perform read and write operations to the PHYs.
Note: The Virtual PHY registers are NOT accessible via these registers.
BITS
DESCRIPTION
31:16
15:0
RESERVED
MII Data
This field contains the value read from or written to the PHYs. For a write
operation, this register should be first written with the desired data. For a
read operation, the PMI_ACCESS register is first written and once the
command is finished, this register will contain the return data.
Note:
Upon a read, the value returned depends on the MII Write bit
(MIIWnR) in the PHY Management Interface Access Register
(PMI_ACCESS). If MIIWnR is 0, the data is from the PHY. If
MIIWnR is 1, the data is the value that was last written into this
register.
TYPE
RO
R/W
DEFAULT
-
00000000h
SMSC LAN9313/LAN9313i
207
DATASHEET
Revision 1.2 (04-08-08)