LAN9353 Datasheet, PDF (488/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
The various LED indication functions listed in the previous tables are described in the following sections.
17.3.1 LED FUNCTION DEFINITIONS WHEN LED_FUN[2:0] = 000B - 101B
The following LED rules apply when LED Function 2-0 (LED_FUN[2:0]) is 000b through 101b:
• “Active” is defined as the pin being driven to the opposite value latched at reset on the related hard-straps. 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.
The following LED function definitions apply when LED Function 2-0 (LED_FUN[2:0]) is 000b through 101b:
• TX - The signal is pulsed active for 80 ms to indicate activity from the Switch Fabric to the external MII pins. This
signal is then made inactive for a minimum of 80 ms, after which the process will repeat if TX activity is again
detected.
Note: Link indication does not affect this function.
• RX - The signal is pulsed active for 80 ms to indicate activity from the external MII pins to the Switch Fabric. This
signal is then made inactive for a minimum of 80 ms, after which the process will repeat if RX activity is again
detected.
Note: Link indication does not affect this function.
• Activity - The signal is pulsed active for 80mS to indicate transmit or receive activity on the port. The signal is
then made inactive for a minimum of 80mS, after which the process will repeat if RX or TX activity is again
detected.
Note: The idle condition is inactive in contrast to that of the Link / Activity function.
Note: The signal will be held inactive if the internal PHY does not have a valid link. Link indication does not affect
this function in external (MII/RMII) modes.
• Link - A steady active output indicates that the port has a valid link (10Mbps or 100Mbps), while a steady inactive
output indicates no link on the port.
• Link / Activity - A steady active output indicates that the port has a valid link, while a steady inactive output indi-
cates no link on the port. When the port has a valid link, the signal is pulsed inactive for 80 ms to indicate transmit
or receive activity on the port. The signal is then made active for a minimum of 80 ms, after which the process will
repeat if RX or TX activity is again detected.
• 100Link - A steady active output indicates the port has a valid link and the speed is 100 Mbps. The signal will be
held inactive if the port does not have a valid link or the speed is not 100 Mbps.
• 100Link / Activity - A steady active output indicates the port has a valid link and the speed is 100 Mbps. The sig-
nal is pulsed inactive for 80 ms to indicate TX or RX activity on the port. The signal is then driven active for a min-
imum of 80 ms, 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 100 Mbps.
• 10Link - A steady active output indicates the port has a valid link and the speed is 10 Mbps. This signal will be
held inactive if the port does not have a valid link or the speed is not 10 Mbps.
• 10Link / Activity - A steady active output indicates the port has a valid link and the speed is 10 Mbps. The signal
is pulsed inactive for 80 ms to indicate transmit or receive activity on the port. The signal is then driven active for a
minimum of 80 ms, 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 10 Mbps.
• Full-duplex / Collision - A steady active output indicates the port is in full-duplex mode. In half-duplex mode, the
signal is pulsed active for 80 ms to indicate a network collision. The signal is then made inactive for a minimum of
80 ms, 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 - A steady active output indicates a valid link with a speed of 100 Mbps. A steady inactive output indicates
a speed of 10 Mbps. The signal will be held inactive if the port does not have a valid link.
17.3.2 LED FUNCTION DEFINITIONS WHEN LED_FUN[2:0] = 111B
When LED Function 2-0 (LED_FUN[2:0]) is 111b , the following LED rules apply:
• The LED pins are push-pull drivers.
• The LED pin is driven high when the function signal is high and is driven low when the function signal is low.
DS00001925A-page 488
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