OXMPCI952 Datasheet, PDF (18/108 Pages) Oxford Semiconductor – Integrated High Performance Dual UARTs, 8-bit Local Bus/Parallel Port. 3.3v PCI/miniPCI interface.

OXFORD SEMICONDUCTOR LTD.
OXmPCI952
Serial port pins
Mode 0, Mode 1
M8,N6
P7,R6
N8,M6
P8,R5
M10,R4
R9
R8
Dir¹ Name
O(h) DTR[1:0]#
Description
Active-low modem data-terminal-ready output. If automated
DTR# flow control is enabled, the DTR# pin is asserted and
deasserted if the receiver FIFO reaches or falls below the
programmed thresholds, respectively.
O(h) 485_En[1:0]
In RS485 half-duplex mode, the DTR# pin may be
programmed to reflect the state of the transmitter empty bit to
automatically control the direction of the RS485 transceiver
buffer (see register ACR[4:3])
O(h) Tx_Clk_Out[1:0] Transmitter 1x clock (baud rate generator output). For
isochronous applications, the 1x (or Nx) transmitter clock
may be asserted on the DTR# pins (see register CKS[5:4])
O(h) RTS[1:0]#
Active-low modem request-to-send output. If automated
RTS# flow control is enabled, the RTS# pin is deasserted
and reasserted whenever the receiver FIFO reaches or falls
below the programmed thresholds, respectively.
I(h) CTS[1:0]#
Active-low modem clear-to-send input. If automated CTS#
flow control is enabled, upon deassertion of the CTS# pin,
the transmitter will complete the current character and enter
the idle mode until the CTS# pin is reasserted. Note: flow
control characters are transmitted regardless of the state of
the CTS# pin.
I(h) DSR[1:0]#
Active-low modem data-set-ready input. If automated DSR#
flow control is enabled, upon deassertion of the DSR# pin,
the transmitter will complete the current character and enter
the idle mode until the DSR# pin is reasserted. Note: flow
control characters are transmitted regardless of the state of
the DSR# pin
I(h) Rx_Clk_In[1:0] External receiver clock for isochronous applications. The
Rx_Clk_In is selected when CKS[1:0] = ‘01’.
I(h) RI[1:0]#
Active-low modem Ring-Indicator input
I(h) Tx_Clk_In[1:0] External transmitter clock. This clock can be used by the
transmitter (and indirectly by the receiver) when CKS[6]=’1’.
O XTLO
Crystal oscillator output
I XTLI
Crystal oscillator input up to 20MHz. External clock pin up to
60MHz.
DS-0020 Jun 05
Page 18