XR17D154IV Exar Corporation, XR17D154IV Datasheet - Page 3

• Manufacturer Part Number: XR17D154IV
• Description: Universal QUART W/ PCI Bus Interface.
• Manufacturer: Exar Corporation

Specifications of XR17D154IV

• Features: *
• Number Of Channels: 4, QUART
• Fifo's: 64 Byte
• Protocol: RS485
• Voltage - Supply: 3.3V, 5V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS Compliant

PIN DESCRIPTIONS
xr
REV. 1.2.2
PCI LOCAL BUS INTERFACE
MODEM OR SERIAL I/O INTERFACE
AD31-AD25,
AD23-AD16,
AD15-AD8,
DEVSEL#
AD7-AD0
FRAME#
C/BE3#-
C/BE0#
TRDY#
STOP#
PERR#
SERR#
CTS0#
DTR0#
DSR0#
RTS0#
IRDY#
IDSEL
AD24,
INTA#
RST#
CD0#
N
RI0#
CLK
PAR
RX0
TX0
AME
2,14,25,36
138-144,
26-33
37-44
P
6-13
134
135
133
125
132
127
131
126
130
129
128
15
16
17
21
18
24
22
23
IN
1,
3
#
T
OD
OD
YPE
IO
IO
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
I
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.
PCI Bus clock input of up to 33.34MHz.
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. 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).
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 Carrier Detect or general purpose input (active low).
UART channel 0 Ring Indicator or general purpose input (active low).
3
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
D
ESCRIPTION
XR17D154