OX16C950 rev B
OXFORD SEMICONDUCTOR LTD.
4.1
Further Pin Information
Pin
Description
Action when used
Bus Interface Pins
Connect to active high chip select generation Tie high – All chip selects must be
logic active in order to access the device
Connect to active high chip select generation Tie high – All chip selects must be
logic active in order to access the device
Connect to active low chip select generation Tie low – All chip selects must be active
Action when not used
CS0
CS1
CS2#
IOR
Chip Select
Chip Select
Chip Select
logic
in order to access the device
Tie low (IOR# will be used to control I/O
read operations)
Additional I/O Read Control Connect to processors active high I/O read
line (and tie IOR# high)
IOW
Additional I/O Write Control Connect to processors active high I/O write
line (and tie IOW# high)
Tie low (IOW# will be used to control
I/O read operations)
Control Pins
INTSEL# Interrupt Control Mode
Tie low to allow software enable/disable of the Leave unconnected (Pulled high
interrupt pin.
internally to leave the interrupt pin
permanently enabled).
DMA Pins
RXRDY# DMA Control signal output
TXRDY# DMA Control signal output
Connect direct to DMA control circuitry
Connect direct to DMA control circuitry
Clock Related Pins
Leave unconnected
Leave unconnected
BDOUT# Baud rate generator output Connect direct to the RCLK pin in order to run Leave unconnected
the receiver with the same clock as the
transmitter
RCLK
Receiver clock input
Connect directly to a suitable receiver clock
source (Usually the BDOUT# pin)
Connect to suitable clock input
n/a
n/a
XTLI
XTLO
Crystal circuit input
Crystal circuit output
Connect to crystal oscillator circuit
Leave unconnected
Miscellaneous Pins
DDIS
ADS#
Driver Disable output
Address Strobe In
Connect to active high bus transceiver drive Leave unconnected
disable (goes high when device is not being
read from)
Connect direct to external control circuitry
(Low-High transition on this pin latches CS0-2
and A0-2)
Tie low
OUT1#
OUT2#
User defined output
User defined output
Connect direct to TTL input of external circuit Leave unconnected
to control
Connect direct to TTL input of external circuit Leave unconnected
to control
Common Channel Pins
SOUT
SIN
Serial data output
Serial data input
Connect to a suitable line driver
Connect to a suitable line receiver
Connect to a suitable line driver
Leave unconnected
(Serial data can not be transmitted)
Leave unconnected
(Serial data can not be received)
Leave unconnected
RTS#
CTS#
DTR#
DSR#
Request-To-Send Modem
signal output
Clear-To-Send Modem signal Connect to a suitable line receiver
input
Data-Terminal-Ready
Modem signal output
Data-Set-Ready
Tie high
Connect to a suitable line driver
Leave unconnected
Tie high
Connect to a suitable line receiver
Modem signal input
Data Sheet Revision 1.2
Page 11
OXFORD [ OXFORD SEMICONDUCTOR ]
