SC01/SC02/SC11/SC12
Sc12hw09.doc page 9 of 37 24.11.1999 V0.9
TF/WB
4.6 10Base-T Interface
Pin Name Type Function
TPTX[+,-] O Twisted Pair Driver (outputs)
These two outputs provide the TP drivers with pre-distortion
capability
TPRX[+,-] I Twisted Pair Receive (inputs).
A differential receiver tied to the receive transformer pair of the
twisted-pair wire.
The receive pair of the twisted-pair medium is driven with 10
Mbits/s Manchester-encoded data
LINK LED O Link and Traffic LED Driver (output)
If TP is LINK-pass, this pin outputs 2.5V.
This pin will output 5V for 80ms to indicate the presence of traffic
on the network.
If no LED / 200Ω combination is connexted to this pin, 1K pullup
should be tied to this pin, to make shure RESET# and NMI
function is available.
4.7 Asynchronous Serial Ports
Pin Name Type Function
TxD[0..1] O Transmit Data (output, asynchronous)
These pins supply asynchronous serial transmit data to
the system from serial port 0 and 1.
RxD[0..1] I Receive Data (input, asynchronous)
These pins supply asynchronous serial receive data from the
system to asynchronous serial ports 0 and 1.
CTS[0..1] I Clear-to-Send (input, asynchronous)
These pins provide the Clear-to-Send signal for asynchronous
serial port 0 and 1 when hardware flow control is enabled for the
port. The CTS signals gate the transmission of data from the
associated serial port transmit register. When CTS is asserted, the
transmitter begins transmission of a frame of data, if any is
available. If CTS is deasserted, the transmitter holds the data in
the serial port transmit register. The value of CTS is checked only
at the beginning of the transmission of the frame.
ENRX0 I Enable-Receiver-Request 0 (input, asynchronous)
This pin provides the Enable Receiver Request for asynchronous
serial port 0 when hardware flow control is enabled for the port.
The ENRX0 signal enables the receiver for the associated serial
port.
RTS[0..1] O Ready-to-Send 0 (output, asynchronous)
These pins provide the Ready-to-Send signal for asynchronous
serial ports 0 and 1 when hardware flow control is enabled for the
port. The RTS signals are asserted when the associated serial port
transmit register contains data that has not been transmitted.
RTR0 O Ready-to-Receive 0 (output, asynchronous)
This pin provides the Ready-to-Receive signal for asynchronous
serial port 0 when hardware flow control is enabled for the port.
The RTR0 signal is asserted when the associated serial port
receive register does not contain valid, unread data.
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