LAN9303MI-AKZE Datasheet, PDF (134/386 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
9.2.4.4
9.2.4.5
Collision Test
External MAC collision testing is not available when operating in the RMII PHY mode. The Collision
Test bit of the Port 1 MII Basic Control Register (P1_MII_BASIC_CONTROL) has no effect on system
operation in RMII PHY mode.
Switch Engine collision testing is available and is enabled when the Switch Collision Test Port 1 bit of
the Port 1 MII Basic Control Register (P1_MII_BASIC_CONTROL) is set. In this test mode, any
transmissions from the Switch Engine will result in the assertion of an internal collision signal to the
Switch Fabric Port 1. Switch Engine collision test occurs regardless of the setting of the Isolate bit.
Loopback Mode
Two forms of loopback testing are available: External MAC loopback and Switch Engine loopback.
External MAC loopback is enabled when the Loopback bit of the Port 1 MII Basic Control Register
(P1_MII_BASIC_CONTROL) is set. Transmissions from the external MAC are not sent to the Switch
Engine. Instead, they are looped back onto the receive path. Transmissions from the Switch Engine
are ignored.
Switch Engine loopback is enabled when the Switch Looopback Port 1 bit of the Port 1 MII Basic
Control Register (P1_MII_BASIC_CONTROL) is set. Transmissions from the Switch Engine are not
sent to the external MAC. Instead, they are looped back internally onto the receive path. Transmissions
from the external MAC are ignored. An internal collision signal to the Switch Engine is available and
is asserted when the Switch Collision Test Port 1 bit is set. Switch Engine loopback occurs regardless
of the setting of the Isolate bit.
Revision 1.5 (07-08-11)
134
DATASHEET
SMSC LAN9303M/LAN9303Mi