XR17D154 Exar Corporation, XR17D154 Datasheet - Page 3

• Manufacturer Part Number: XR17D154
• Description: Four-channel Pci-bus Uart
• Manufacturer: Exar Corporation

PIN DESCRIPTIONS
XR17D154
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
REV. P1.0.0
PCI LOCAL BUS INTERFACE
MODEM OR SERIAL I/O INTERFACE
AD31-AD0
DEVSEL#
FRAME#
C/BE3#
C/BE0#
PERR#
SERR#
TRDY#
STOP#
DTR0#
DSR0#
RTS0#
CTS0#
IDSEL
IRDY#
INTA#
N
RST#
CD0#
RI0#
CLK
PAR
RX0
TX0
TX1
AME
-
2,14,25,36
138-144,
1, 6-13
26-33
37-44
P
134
135
133
125
132
127
131
126
130
129
128
106
15
16
17
21
18
24
22
23
IN
3
#
T
OD
OD
YPE
IO
IO
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
I
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.
Bus clock input of up to 33MHz.
Address data lines [31:0] (bidirectional).
Bus transaction cycle frame (active low). It indicates the beginning and dura-
tion of an access.
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.
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.
Target Ready (active low).
Target request to stop current transaction (active low). 5
Initialization device select (active high).
Device select to the XR17D154 (active low).
Device interrupt from XR17D154 (open drain, active low).
Parity is even across AD[31:0] and C/BE[3:0]# (bidirectional, active high).
Parity error indicator to host (active low). Optional in bus target application.
System error indicator to host (open drain, active low). Optional in bus target
application.
UART channel 0 Transmit Data or infrared transmit data.
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].
UART channel 0 Request to Send or general purpose output (active low).
UART channel 0 Clear to Send or general purpose input (active low).
UART channel 0 Data Terminal Ready or general purpose output (active low).
UART channel 0 Data Set Ready or general purpose input (active low).
UART channel 0
UART channel 0 Ring Indicator or general purpose input (active low).
UART channel 1 Transmit Data or infrared transmit data.
3
Carrier Detect or general purpose input (active low).
D
ESCRIPTION
PRELIMINARY
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