Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Table 2.1 RMII Signals
BUFFER
TYPE
NUM PINS
NAME
SYMBOL
DESCRIPTION
Transmit
Data 0
TXD0
VIS
VIS
The MAC transmits data to the transceiver using
this signal.
1
Transmit
Data 1
TXD1
TXEN
The MAC transmits data to the transceiver using
this signal.
1
1
Transmit
Enable
VIS
(PD)
Indicates that valid transmission data is present
on TXD[1:0].
Receive
Data 0
RXD0
VO8
Bit 0 of the 2 data bits that are sent by the
transceiver on the receive path.
PHY
Operating
Mode 0
Configuration
Strap
MODE0
VIS
(PU)
Combined with MODE1 and MODE2, this
configuration strap sets the default PHY mode.
1
See Note 2.1 for more information on
configuration straps.
Note:
Refer to Section 3.7.2, "MODE[2:0]:
Mode Configuration," on page 31 for
additional details.
Receive
Data 1
RXD1
VO8
Bit 1 of the 2 data bits that are sent by the
transceiver on the receive path.
PHY
Operating
Mode 1
Configuration
Strap
MODE1
VIS
(PU)
Combined with MODE0 and MODE2, this
configuration strap sets the default PHY mode.
1
See Note 2.1 for more information on
configuration straps.
Note:
Refer to Section 3.7.2, "MODE[2:0]:
Mode Configuration," on page 31 for
additional details.
Receive Error
RXER
VO8
This signal is asserted to indicate that an error
was detected somewhere in the frame presently
being transferred from the transceiver.
PHY Address
0
Configuration
Strap
PHYAD0
VIS
(PD)
This configuration strap sets the transceiver’s
SMI address.
1
See Note 2.1 for more information on
configuration straps.
Note:
Refer to Section 3.7.1, "PHYAD[0]: PHY
Address Configuration," on page 31 for
additional information.
Revision 1.4 (08-23-12)
10
SMSC LAN8720A/LAN8720Ai
DATASHEET
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