ETX-CN700
Appendix 1
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PIDE_IOW#/ SIDE_IOW#
IDE IOW# Command. This is the IOW# command output pin used to notify the IDE device that the available
Write Data is already asserted by the IDE Busmaster in PIO and DMA mode. In Ultra-33 mode, this pin has
different functions.
PIDE_INTRQ/ SIDE_INTRQ
Interrupt request signal from the IDE device.
HDRST#
Low-active hardware reset (RSTDRV inverted).
DASP_S
Time-multiplexed, open collector output that indicates that a drive is active. Also used for
Master/Slave negotiation on the Secondary IDE channel. If an IDE device such as a Flash Disk exists onboard
the ETX module, this signal must be connected to the DASP_S pin of any other device connected to the
Secondary IDE channel.
PDIAG_S
The signal is used for Master/Slave negotiation on the Secondary IDE channel. It is asserted by the Slave to
indicate to a master that the slave has passed its internal Diagnostic command. If an IDE device such as a Flash
Disk exists onboard the ETX module, this signal must be connected to the PDIAG_S pin of any other device
connected to the Secondary IDE channel. This pin may additionally be used to detect the presence of the 80
conductor IDE cable which is required to support DMA66 or DMA100.
CBLID_P
On ETX modules that support DMA66 or DMA100, this pin may be used to detect the presence of an 80
conductor IDE cable on the primary IDE channel. This allows BIOS or system software to determine whether to
enable high-speed transfer modes.
Ethernet Signals
The ETX Ethernet Interface is designed for use with an external 1:1/ 1:1 transformer.
TXD#, TXD (ANALOG TWISTED PAIR)
Ethernet Transmit Differential Pair. These pins transmit the serial bit stream on the Unshielded Twisted Pair
(UTP) cable. The current-driven differential driver can be two-level (10BASE-T) or three-level (100BASE-TX)
signals depending on the mode of operation. These signals interface to the Ethernet cable through an isolation
transformer.
RXD#, RXD ( ANALOG TWISTED PAIR)
Ethernet Receive Differential Pair. These pins receive the serial bit stream from the isolation transformer. The
bit stream can be transmitted in either two-level (10BASE-T) or three-level (100BASE-TX) signals depending
on the mode of operation. These signals interface to the Ethernet cable through an isolation transformer.
ACTLED/ LILED
The Activity LED pin indicates either transmitted or received data activity on the Ethernet port. This pin is
asserted low when activity is detected. It can sink 5mA to ground through an external LED and a limiting
resistor to a 3.3V source.
The Link Integrity LED pin indicates link integrity. This pin is asserted low when the link is valid. It can sink
5mA to ground through an external LED and a limiting resistor to a 3.3V source.
These functions are combined on this pin
LILED/3V3VSUS
The Ethernet MAC on the ETX CN700 does not support a separate Link Function. This is provided on the
ACTLED/LILED pin. Please connect this pin to the RJ45 Link LED via a current limiting resistor.
SPEEDLED
The Speed LED pin indicates high speed operation. This LED is not supported by all ETX boards. This pin is
asserted low when a 100Mbps link is detected, and is not asserted for a 10Mbps link. It can sink 5mA to ground
through an external LED and a current limiting resistor to a 3.3V source.
