LAN9353 Datasheet, PDF (18/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
TABLE 3-4: LAN PORT B PIN DESCRIPTIONS (CONTINUED)
Num
Pins
Name
Port BTP TX/RX
Positive
1
Channel 2
Port B FX RX
Positive
Port B TP TX/RX
Negative
1
Channel 2
Port B FX RX
Negative
Port B FX
Signal Detect
(SD)
Symbol
RXPB
RXNB
FXSDB
Port B FX
Loss Of Signal
1
(LOS)
FXLOSB
Buffer
Type
AIO
Description
Port B Twisted Pair Transmit/Receive Positive
Channel 2. See Note 3.
AI
Port B Fiber Receive Positive.
Port B Twisted Pair Transmit/Receive Negative
AIO Channel 2. See Note 3.
AI
Port B Fiber Receive Negative.
ILVPECL
Port B Fiber Signal Detect. When FX-LOS mode is
not selected, this pin functions as the Signal Detect
input from the external transceiver. A level above
2 V (typ.) indicates valid signal.
IS
(PU)
When FX-LOS mode is selected, the input buffer is
disabled.
Port B Fiber Loss of Signal. When FX-LOS mode is
selected (via fx_los_strap_2), this pin functions as
the Loss of Signal input from the external trans-
ceiver. A high indicates LOS while a low indicates
valid signal.
Port B FX-SD
Enable Strap
FXSDENB
When FX-LOS mode is not selected, the input buffer
and pull-up are disabled.
Port B FX-SD Enable. When FX-LOS mode is not
selected, this strap input selects between FX-SD
and copper twisted pair mode. A level above 1 V
(typ.) selects FX-SD.
AI
When FX-LOS mode is selected, the input buffer is
disabled.
See Note 4.
Note 3: In copper mode, either channel 1 or 2 may function as the transmit pair while the other channel functions as
the receive pair. The pin name symbols for the twisted pair pins apply to a normal connection. If HP Auto-
MDIX is enabled and a reverse connection is detected or manually selected, the RX and TX pins will be
swapped internally.
Note 4: Configuration strap pins are identified by an underlined symbol name. Configuration strap values are
latched on power-on reset or RST# de-assertion. Refer to Section 7.0, "Configuration Straps," on page 67
for more information.
Note: Port B is connected to Switch Fabric port 2.
DS00001925A-page 18
 2015 Microchip Technology Inc.