LAN8740A Datasheet, PDF (10/136 Pages) Microchip Technology – Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

LAN8740A/LAN8740Ai
TABLE 2-1: MII/RMII SIGNALS (CONTINUED)
Num Pins
Name
Symbol
Buffer Type
Description
1
Collision Detect
COL
(MII Mode)
Carrier Sense /
Receive Data
Valid
(RMII Mode)
CRS_DV
VO8
VO8
This signal is asserted to indicate detection of a
collision condition in MII mode.
This signal is asserted to indicate the receive
medium is non-idle in RMII mode. When a
10BASE-T packet is received, CRS_DV is
asserted, but RXD[1:0] is held low until the SFD
byte (10101011) is received.
PHY Operat-
ing Mode 2
Configuration
Strap
MODE2
VIS
(PU)
Note:
Per the RMII standard, transmitted data
is not looped back onto the receive data
pins in 10BASE-T half-duplex mode.
Combined with MODE0 and MODE1, this configu-
ration strap sets the default PHY mode.
See Note 1 for more information on configuration
straps.
Note:
Refer to Section 3.7.2, "MODE[2:0]:
Mode Configuration" for additional
details.
1
Carrier Sense
CRS
(MII Mode)
VO8
(PD)
This signal indicates detection of a carrier in MII
mode.
Note 1: Configuration strap values are latched on power-on reset and system reset. Configuration straps are iden-
tified by an underlined symbol name. Signals that function as configuration straps must be augmented with
an external resistor when connected to a load. Refer to Section 3.7, "Configuration Straps" for additional
information.
DS00001987A-page 10
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