LAN9312 datasheet(245/458 Pages) SMSC

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

SMSC LAN9312

245

Revision 1.2 (04-08-08)

DATASHEET

14.2.8

Virtual PHY

This section details the Virtual PHY System CSR’s. These registers provide status and control

information similar to that of a real PHY while maintaining IEEE 802.3 compatibility. The Virtual PHY

registers are addressable via the memory map, as described in Table 14.1, as well as serially via the

MII management protocol (IEEE 802.3 clause 22). When accessed serially, these registers are

accessed indirectly through the Host MAC MII Access Register (HMAC_MII_ACC) and Host MAC MII

Data Register (HMAC_MII_DATA) via the MII serial management protocol specified in IEEE 802.3

clause 22. When being accessed serially, the Virtual PHY will respond when the PHY address equals

the address assigned by the phy_addr_sel_strap configuration strap, as defined in Section 7.1.1, "PHY

Addressing," on page 82. A list of all Virtual PHY register indexes for serial access can be seen in

Table 14.4. For more information on the Virtual PHY access modes, refer to section Section 14.4. For

Virtual PHY functionality and operation information, see Section 7.3, "Virtual PHY," on page 96.

Note:

All Virtual PHY registers follow the IEEE 802.3 (clause 22.2.4) specified MII management

specified register index (in decimal) is included under the LAN9312 memory mapped offset of

each Virtual PHY register as a reference. For additional information, refer to the IEEE 802.3

Specification.

Note:

When serially accessed, the Virtual PHY registers are only 16-bits wide, as is standard for MII

management of PHY’s.

Table 14.4 Virtual PHY MII Serially Adressable Register Index

INDEX #

SYMBOL

VPHY_BASIC_CTRL

Virtual PHY Basic Control Register, Section 14.2.8.1

VPHY_BASIC_STATUS

Virtual PHY Basic Status Register, Section 14.2.8.2

VPHY_ID_MSB

Virtual PHY Identification MSB Register, Section 14.2.8.3

VPHY_ID_LSB

Virtual PHY Identification LSB Register, Section 14.2.8.4

VPHY_AN_ADV

Virtual PHY Auto-Negotiation Advertisement Register,

Section 14.2.8.5

VPHY_AN_LP_BASE_ABILITY

Virtual PHY Auto-Negotiation Link Partner Base Page Ability

VPHY_AN_EXP

Virtual PHY Auto-Negotiation Expansion Register,

Section 14.2.8.7

VPHY_SPEC_CTRL_STATUS

Virtual PHY Special Control/Status Register, Section 14.2.8.8

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