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Pinout detail tables and signal descriptions
20
NS7520 Hardware Reference, Rev. D 03/2006
MDIO Management data IO A bi-directional signal that provides a serial data
channel between the NS7520 and the external
Ethernet PHY module.
TXCLK Transmit clock An input to the NS7520 from the external PHY
module. TXCLK provides the synchronous data
clock for transmit data.
TXD3
TXD2
TXD1
TXD0
Transmit data signals Nibble bus used by the NS7520 to drive data to the
external Ethernet PHY. All transmit data signals are
synchronized to TXCLK.
In ENDEC mode, only TXD0 is used for transmit
data.
TXER Transmit coding error Output asserted by the NS7520 when an error has
occurred in the transmit data stream.
TXEN Transmit enable Asserted when the NS7520 drives valid data on
the TXD outputs. This signal is synchronized to
TXCLK.
COL Transmit collision Input signal asserted by the external Ethernet PHY
when a collision is detected.
CRS Receive carrier sense Asserted by the external Ethernet PHY whenever
the receive medium is non-idle.
RXCLK Receive clock An input to the NS7520 from the external PHY
module. The receive clock provides the
synchronous data clock for receive data.
RXD3
RXD2
RXD1
RXD0
Receive data signals Nibble bus used by the NS7520 to input receive
data from the external Ethernet PHY. All receive
data signals are synchronized to RXCLK.
In ENDEC mode, only RXD0 is used for receive
data.
RXER Receive error Input asserted by the external Ethernet PHY when
the Ethernet PHY encounters invalid symbols from
the network.
RXDV Receive data valid Input asserted by the external Ethernet PHY when
the PHY drives valid data on the RXD inputs.
Mnemonic Signal Description
Table 7: Ethernet interface MAC signal description