XR17D154 Datasheet, PDF (3/69 Pages) Exar Corporation – UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART

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REV. 1.2.0
XR17D154
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
PIN DESCRIPTIONS
NAME
PIN #
PCI LOCAL BUS INTERFACE
RST#
134
TYPE
DESCRIPTION
I PCI 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.
CLK
135
I PCI Bus clock input of up to 33.34MHz.
AD31-AD25,
AD24,
AD23-AD16,
AD15-AD8,
AD7-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 XR17D154 (active low).
INTA#
133
OD Device interrupt from XR17D154 (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
MODEM OR SERIAL I/O INTERFACE
TX0
125
O
RX0
132
I
RTS0#
127
O
System error indicator to host (open drain, active low). Optional in bus target
application.
UART channel 0 Transmit Data or infrared transmit data. Normal TXD output
idles HIGH while infrared TXD output idles LOW.
UART channel 0 Receive Data or infrared receive data. Normal RXD input
idles HIGH. The infrared pulses typically idle LOW but can be inverted inter-
nally prior the decoder by FCTR[4].
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).
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