LAN9303MI-AKZE Datasheet, PDF (113/386 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII
Datasheet
7.3.2.1
7.3.3
7.3.3.1
7.3.3.2
Note: In MAC mode, the Virtual PHY registers are accessible through their memory mapped registers
via the SMI or I²C serial management interfaces only. The Virtual PHY registers are not
accessible through MII management.
Full-Duplex Flow Control
In the MAC mode of operation, the Virtual PHY is not applicable. Therefore, full-duplex flow control
should be controlled manually by the host via the Port 0 Manual Flow Control Register
(MANUAL_FC_0), based on the external PHYs auto-negotiation results.
Virtual PHY Resets
In addition to the chip-level hardware reset (nRST) and Power-On Reset (POR), the Virtual PHY
supports two block specific resets. These are is discussed in the following sections. For detailed
information on all resets, refer to Section 4.2, "Resets," on page 48.
Virtual PHY Software Reset via RESET_CTL
The Virtual PHY can be reset via the Reset Control Register (RESET_CTL) by setting the Virtual PHY
Reset (VPHY_RST) bit. This bit is self clearing after approximately 102uS.
Virtual PHY Software Reset via VPHY_BASIC_CTRL
The Virtual PHY can also be reset by setting the Reset (VPHY_RST) bit of the Virtual PHY Basic
Control Register (VPHY_BASIC_CTRL). This bit is self clearing and will return to 0 after the reset is
complete.
SMSC LAN9303M/LAN9303Mi
113
DATASHEET
Revision 1.5 (07-08-11)