xr16c872iq Exar Corporation, xr16c872iq Datasheet - Page 3

• Manufacturer Part Number: xr16c872iq
• Description: Dual Uart With 1284 Parallel Port And Plug-and-play Controller
• Manufacturer: Exar Corporation

To ISA Bus
Rev. 1.00
To External
E E P R O M
V C C
D0-D7
A0-A15
A E N
IOR#
I O W #
IOCHRDY
IRQ3-7,9-12,15
DREQ0,1,3,5
DACK0,1,3,5#
T C
E E D
E E C L K
E E C S
R E S E T
XTAL1
(22.1184 MHz)
XTAL2
M A N #
Figure 2, Funtional Block Diagram with Plug-and-Play Interface.
Buffer
Osc./
Plug-and-Play
Controller
Controller
EEPROM
ISA Bus
7.3728 MHz
Divide
by 3
DISCONTINUED
3
Registers
Control
Baud Rate Gen.
U A R T
Parallel Port Controller with
Level II Electrical Interface
(same as channel A block)
1284 Bi-directional
UART Channel B
UART Channel A
Transmit
Receive
bytes)
bytes)
FIFO
FIFO
(128
(128
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Interface
M o d e m
IrDA v1.0
IrDA v1.0
Transmit
Register
Encoder
Register
Decoder
Receive
Shift
Shift
XR16C872
D T R A #
R T S A #
D S R A #
C T S A #
C D A #
RIA#
RXA
TXB,
RXB,
DTR#,
RTS#, etc.
TXA
PD0-PD7
INIT#
S T R O B E #
SELCTIN#
A U T O F D #
PDIR
P E
S E L E C T
B U S Y
A C K #
E R R #
To Serial Port A
Transceivers
To Serial Port B
Transceivers
Port Printer
To Parallel