LAN9303 Datasheet, PDF (134/366 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

12.3.1
Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
Datasheet
LED Function Definitions when LED_FUN[1:0] = 00b, 01b, or 10b
When LED Function 1-0 (LED_FUN[1:0]) is 00b, 01b, or 10b, the following LED rules apply:
„ “Active” is defined as the pin being driven to the opposite value latched at reset on the
led_pol_strap[5:0] LED polarity hard-straps. LED polarity is determined by these hard-straps as
detailed in Section 4.2.4, "Configuration Straps," on page 45. The LED polarity cannot be modified
via soft-straps.
„ “Inactive” is defined as the pin not being driven.
„ The input buffers and pull-ups are disabled on the shared GPIO/LED pins.
When LED Function 1-0 (LED_FUN[1:0]) is 00b, 01b, or 10b, the following LED function definitions
apply:
„ TX Port 0 - The signal is pulsed active for 80mS to indicate activity from the Switch Fabric to the
external MII pins. This signal is then made inactive for a minimum of 80mS, after which the process
will repeat if TX activity is again detected.
Note: Link indication does not affect this function.
„ RX Port 0 - The signal is pulsed active for 80mS to indicate activity from the external MII pins to
the Switch Fabric. This signal is then made inactive for a minimum of 80mS, after which the
process will repeat if RX activity is again detected.
Note: Link indication does not affect this function.
„ 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.
Revision 1.3 (08-27-09)
134
DATASHEET
SMSC LAN9303/LAN9303i