Digi NS7520 manual Col, Crs

P i n o u t d e t a i l t a b l e s a n d s i g n a l d e s c r i p t i o n s

Mnemonic	Signal	Description
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	Transmit data signals	Nibble bus used by the NS7520 to drive data to the
TXD2		external Ethernet PHY. All transmit data signals are
TXD1		synchronized to TXCLK.
		In ENDEC mode, only TXD0 is used for transmit
TXD0
		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	Receive data signals	Nibble bus used by the NS7520 to input receive
RXD2		data from the external Ethernet PHY. All receive
RXD1		data signals are synchronized to RXCLK.
		In ENDEC mode, only RXD0 is used for receive
RXD0
		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.

Table 7: Ethernet interface MAC signal description

2 0 N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v . D 0 3 / 2 0 0 6