lan8700 Standard Microsystems Corp., lan8700 Datasheet - Page 14

• Manufacturer Part Number: lan8700
• Description: ?15kv Esd Protected Mii/rmii 10/100 Ethernet Transceiver With Hp Auto-mdix Support And Flexpwrtm Technology In A Small Footprint
• Manufacturer: Standard Microsystems Corp.

Revision 2.0 (07-15-08)
SIGNAL NAME
SIGNAL NAME
SPEED100/
FDUPLEX/
ACTIVITY/
RX_CLK/
REGOFF
CRS_DV
PHYAD4
PHYAD0
PHYAD1
PHYAD2
PHYAD3
RX_DV
LINK/
RMII/
CRS/
COL/
TYPE
TYPE
Table 3.1 MII Signals (continued)
±15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support and flexPWR
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
Table 3.2 LED Signals
DATASHEET
Receive Data Valid: Indicates that recovered and decoded data
nibbles are being presented on RXD[3:0].
Note:
Receive Clock: In MII mode, this pin is the receive clock output.
25MHz in 100Base-TX mode. 2.5MHz in 10Base-T mode.
Note:
Regulator Off: This pin may be used to configure the internal
1.8V regulator off. As described in
sampled during the power-on sequence to determine if the
internal regulator should turn on. When the regulator is disabled,
external 1.8V must be supplied to VDD_CORE, and the voltage
at VDD33 must be at least 2.64V before voltage is applied to
VDD_CORE.
MII Mode Collision Detect: Asserted to indicate detection of
collision condition.
RMII – MII/RMII mode selection is latched on the rising edge of
the internal reset (nreset) based on the following strapping:
RMII Mode CRS_DV (Carrier Sense/Receive Data Valid)
Asserted to indicate when the receive medium is non-idle. When
a 10BT packet is received, CRS_DV is asserted, but RXD[1:0] is
held low until the SFD byte (10101011) is received. In 10BT, half-
duplex mode, transmitted data is not looped back onto the
receive data pins, per the RMII standard.
Carrier Sense: Indicates detection of carrier.
Note:
LED1 – SPEED100 indication. Active indicates that the selected
speed is 100Mbps. Inactive indicates that the selected speed is
10Mbps.
Note:
LED2 – LINK ON indication. Active indicates that the Link
(100Base-TX or 10Base-T) is on.
Note:
LED3 – ACTIVITY indication. Active indicates that there is
Carrier sense (CRS) from the active PMD.
Note:
LED4 – DUPLEX indication. Active indicates that the PHY is in
full-duplex mode.
Note:
Float this pin for MII mode or pull-high with an external resistor
to VDDIO (see
Resistors,” on page
See
more details.
Section 4.6.3, "MII vs. RMII Configuration," on page 26
14
This pin has an internal pull-down resistor, and must not
be high during reset. This signal is not used in RMII
Mode.
This signal is not used in RMII Mode.
This signal is mux’d with PHYAD4
This signal is mux’d with PHYAD0
This signal is mux’d with PHYAD1
This signal is mux’d with PHYAD2
This signal is mux’d with PHYAD3
Table 4.3, “Boot Strapping Configuration
32) to set the device in RMII mode.
DESCRIPTION
DESCRIPTION
Section
SMSC LAN8700/LAN8700i
4.9, this pin is
TM
Technology in a Small Footprint
Datasheet
for