Specifications

dLAN 200 AVmodule 6400
10
devolo AG
Charlottenburger Allee 60 Tel.: [phone] www.devolo.com
D-52068 Aachen Fax: [phone] [e-mail]
6.2 Pin Descriptions by Group
Group Pin No Signal Name Description MAC
Mode
PHY
Mode
MII 13
12
11
10
MII_RXD0
MII_RXD1
MII_RXD2
MII_RXD3
MII Receive Data. The PHY controller drives
MII_RXD[3:0] and the MAC core receives
MII_RXD[3:0]. MII_RXD[3:0] transition
synchronously with respect to MII_RXCLK. For
each MII_RXCLK period i
n which MII_RXDV is
asserted, MII_RXD[3:0] is valid. MII_RXD0 is
the least-significant bit. The PHY controller tri-
states MII_RXD[3:0] in isolate mode.
I O
15 MII_RXCLK
MII Receive Clock. MII_RXCLK is a continuous
clock that provides the timing reference for the
transfer of the MII_RXDV and MII_RXD[3:0]
signals from the PHY controller to the MAC
core. The PHY controller sources MII_RXCLK.
MII_RXCLK frequency is equal to 25% of the
data rate of the received signal on the Ethernet
cable. The PHY controller tri-states
MII_RXCLK in isolate mode.
I O
14 MII_RXDV MII Receive Data Valid. The PHY controller
asserts MII_RXDV to indicate to the MAC core
that it is presenting the recovered and decoded
data bits on MII_RXD[3:0] and that the data on
MII_RXD[3:0] is synchronous to MII_RXCLK.
MÍI_RXDV transitions synchronously with
respect to MII_RXCLK. MII_RXDV remains
asserted continuously from the first recovered
nibble of the frame through the final recovered
nibble, and is deactivated prior to the first
MII_RXCLK that follows the final nibble. The
PHY controller tri-states MII_RXDV in isolate
mode.
I O
17 MII_RXER MII Receive Error. The PHY controller asserts
MII_RXER high for one or more MII_RXCLK
periods to indicate to the MAC core that an
error (a coding error or any error that the PHY
is capable of detecting that is otherwise
undetectable by the MAC) was detected
somewhere in the current frame. MII_RXER
transitions synchronously with respect to
MII_RXCLK. While MII_RXDV is inactive,
MII_RXER has no effect on the MAC core.
The
PHY controller tri-states MII_RXER in isolate
mode.
I O
23 MII_COL MII Collision Detected. The PHY controller
asserts MII_COL when it detects a collision on
the medium. MII_COL remains asserted while
the collision condition persists. MII
_COL signal
transitions are not synchronous to either the
MII_TXCLK or the MII_RXCLK. The MAC core
ignores the MII_COL signal when operating in
the full-duplex mode. The PHY controller tri-
states MII_COL in isolate mode.
I O