XR17L154 Datasheet, PDF (3/56 Pages) Exar Corporation – 3.3V PCI BUS QUAD UART

XR17L154
3.3V PCI BUS QUAD UART
REV. 1.1.0
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DISCONTINUED
PIN DESCRIPTIONS
NAME
PIN #
TYPE
PCI LOCAL BUS INTERFACE
DESCRIPTION
RST#
134
I Bus reset input (active low). It resets the PCI local bus configuration space
registers, device configuration registers and UART channel registers to the
default condition, see Table 18 .
CLK
135
I Bus clock input of up to 33MHz at 3.3V.
AD31-AD0
138-144,
1, 6-13
26-33
37-44
IO Address data lines [31:0] (bidirectional).
FRAME#
15
I Bus transaction cycle frame (active low). It indicates the beginning and dura-
tion of an access.
C/BE3#-
C/BE0#
2,14,25,36
I Bus Command/Byte Enable [3:0] (active low). This line is multiplexed for bus
Command during the address phase and Byte Enable during the data phase.
IRDY#
16
I Initiator Ready (active low). During a write, it indicates valid data is present on
data bus. During a read, it indicates the master is ready to accept data.
TRDY#
17
O Target Ready (active low).
STOP#
21
O Target request to stop current transaction (active low). 5
IDSEL
3
I Initialization device select (active high).
DEVSEL#
18
O Device select to the XR17L154 (active low).
INTA#
133
OD Device interrupt from XR17L154 (open drain, active low).
PAR
24
IO Parity is even across AD[31:0] and C/BE[3:0]# (bidirectional, active high).
PERR#
22
O Parity error indicator to host (active low). Optional in bus target application.
SERR#
23
OD System error indicator to host (open drain, active low). Optional in bus target
application.
MODEM OR SERIAL I/O INTERFACE
TX0
125
O UART channel 0 Transmit Data or infrared transmit data.
RX0
132
I UART channel 0 Receive Data or infrared receive data. Normal RXD input
idles at logic 1 condition. The infrared pulses can be inverted internally prior
the decoder by FCTR[4].
RTS0#
127
O UART channel 0 Request to Send or general purpose output (active low).
CTS0#
131
I UART channel 0 Clear to Send or general purpose input (active low).
DTR0#
126
O UART channel 0 Data Terminal Ready or general purpose output (active low).
DSR0#
130
I UART channel 0 Data Set Ready or general purpose input (active low).
CD0#
129
I UART channel 0 Carrier Detect or general purpose input (active low).
RI0#
128
I UART channel 0 Ring Indicator or general purpose input (active low).
TX1
106
O UART channel 1 Transmit Data or infrared transmit data.
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