Phy management signals – Altera Triple Speed Ethernet MegaCore Function User Manual
Page 125
Description
I/O
Name
RGMII control input signal. Expects
gm_rx_dv
on the positive edge of
rx_clk
and a logical derivative of (
gm_rx_dv XOR gm_rx_err)
on the
negative edge of
rx_clk
.
I
rx_control
MII Transmit
MII transmit data bus.
O
m_tx_d[3:0]
Asserted to indicate that the data on the MII transmit data bus is valid.
O
m_tx_en
Asserted to indicate to the PHY device that the frame sent is invalid.
O
m_tx_err
MII Receive
MII receive data bus.
I
m_rx_d[3:0]
Assert this signal to indicate that the data on the MII receive data bus
is valid. Keep this signal asserted during frame reception, from the first
preamble byte until the last byte of the CRC field is received.
I
m_rx_en
The PHY asserts this signal to Indicate that the receive frame contains
errors.
I
m_rx_err
MII PHY Status
Collision detection. The PHY asserts this signal to indicate a collision
during frame transmission. This signal is not used in full- duplex or
gigabit mode.
I
m_rx_col
Carrier sense detection. The PHY asserts this signal to indicate that it
has detected transmit or receive activity on the Ethernet line. This
signal is not used in full-duplex or gigabit mode.
I
m_rx_crs
PHY Management Signals
Table 7-11: PHY Management Interface Signals
Description
I/O
Name
Management data input.
I
mdio_in
Management data output.
O
mdio_out
An active-low signal that enables
mdio_in
or
mdio_out
. For more
information about the MDIO connection, refer to
on page 4-21.
O
mdio_oen
Management data clock. Generated from the Avalon-MM interface
clock signal,
clk
. Specify the division factor using the Host clock
divisor parameter such that the frequency of this clock does not exceed
2.5 MHz. For more information about the parameters, refer to
on page 3-2.
A data bit is shifted in/out on each rising edge of this clock. All fields
are shifted in and out starting from the most significant bit.
O
mdc
Interface Signals
Altera Corporation
UG-01008
PHY Management Signals
7-10
2014.06.30