LAN9303MI-AKZE Datasheet, PDF (147/386 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
„ Link / Activity Port 1/2 - A steady active output indicates that the port has a valid link, while a
steady inactive output indicates no link on the port. The signal is pulsed inactive for 80mS to
indicate transmit or receive activity on the port. The signal is then made active for a minimum of
80mS, after which the process will repeat if RX or TX activity is again detected.
„ Full-duplex / Collision Port 1/2 - A steady active output indicates the port is in full-duplex mode.
In half-duplex mode, the signal is pulsed active for 80mS to indicate a network collision. The signal
is then made inactive for a minimum of 80mS, after which the process will repeat if another collision
is detected. The signal will be held inactive if the port does not have a valid link.
„ Speed Port 1/2 - A steady active output indicates a valid link with a speed of 100Mbps. A steady
inactive output indicates a speed of 10Mbps. The signal will be held inactive if the port does not
have a valid link.
„ 100Link / Activity Port 1/2 - A steady active output indicates the port has a valid link and the
speed is 100Mbps. The signal is pulsed inactive for 80mS to indicate TX or RX activity on the port.
The signal is then driven active for a minimum of 80mS, after which the process will repeat if RX
or TX activity is again detected. The signal will be held inactive if the port does not have a valid
link or the speed is not 100Mbps.
„ 10Link / Activity Port 1/2 - A steady active output indicates the port has a valid link and the speed
is 10Mbps. The signal is pulsed inactive for 80mS to indicate transmit or receive activity on the
port. The signal is then driven active for a minimum of 80mS, after which the process will repeat if
RX or TX activity is again detected. This signal will be held inactive if the port does not have a
valid link or the speed is not 10Mbps.
12.3.2
LED Function Definitions when LED_FUN[1:0] = 11b
When LED Function 1-0 (LED_FUN[1:0]) is 11b, the following LED rules apply:
„ The LED pins are push-pull drivers.
„ The LED polarity does not depend upon the led_pol_strap[5:0] LED polarity hard-straps. The LED
pin is driven high when the function signal is high, and is driven low when the function signal is low.
„ The input buffers and pull-ups are disabled on the shared GPIO/LED pins.
When LED Function 1-0 (LED_FUN[1:0]) is 11b, the following LED function definitions apply:
„ TX_EN Port 0 - Non-stretched TX_EN signal from the Switch Fabric to the external MII pins.
Note: Link indication does not affect this function.
„ RX_DV Port 0 - Non-stretched RX_DV signal from the external MII pins to the Switch Fabric.
Note: Link indication does not affect this function.
„ TX_EN Port 1 - Non-stretched TX_EN signal from the Switch Fabric to the PHY or external MII
pins.
Note: Link indication does not affect this function.
„ RX_DV Port 1 - Non-stretched RX_DV signal from the PHY or external MII pins to the Switch
Fabric.
Note: Link indication does not affect this function.
„ TX_EN Port 2 - Non-stretched TX_EN signal from the Switch Fabric to the PHY.
Note: Link indication does not affect this function.
„ RX_DV Port 2 - Non-stretched RX_DV signal from the PHY to the Switch Fabric.
Note: Link indication does not affect this function.
SMSC LAN9303M/LAN9303Mi
147
DATASHEET
Revision 1.5 (07-08-11)