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DP83903 Datasheet

  • DP83903

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DP83903 Configurable Multiple Function PCMCIA Interface Chip
August 1995
DP83903
Configurable Multiple Function PCMCIA Interface Chip
General Description
National鈥檚 DP83903 acts as a standard interface between
the PCMCIA bus and card-side local bus for I O and memo-
ry PCMCIA cards This device allows the card designer to
focus on the design of the dual I O functions while providing
a one-chip solution for I O memory window control concur-
rent interrupt control EEPROM interfacing and power man-
agement In addition to being configurable to interface to
any two ISA compatible I O functions the DP83903 sup-
ports logic necessary to simplify a design that uses the Na-
tional DP83902A ST-NIC Ethernet Controller as one of the
functions
The DP83903 is fully compliant with PCMCIA version 2 1
and is compatible with serial 4-kbit and 16-kbit EEPROMs
with 8-bit and 16-bit organizations that use the MICRO-
WIRE
TM
protocol This multi-function interface IC allows the
system software to setup I O decode windows and provides
the Attribute memory decode control that allow attribute
read and write data transfers
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
PCMCIA Bus Interface
Compliant with multi-function extension to PCMCIA
Standards 3 X
PCMCIA version 2 1 configuration registers
Serial EEPROM interface compatible with MICROWIRE
EEPROM protocol
2-kbyte on chip RAM for attribute memory which shad-
ows the CIS and is used for loading static registers
Address decoding and control for 2 I O functions
Logic to support any two interrupt capable I O func-
tions on a PCMCIA card
Power management and clock control
Programmable arbitration unit for PCMCIA host and two
functions
Common memory logic
National DP83902A Ethernet LAN support logic for
shared memory architecture only
4 Bit direction programmable generic digital port
ISA-like interface to card function
1 0 System Diagram
TL F 12483 鈥?1
FIGURE 1-1
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRE
TM
is a trademark of National Semiconductor Corporation
Ethernet is a trademark of Xerox Corporation
C
1995 National Semiconductor Corporation
TL F 12483
RRD-B30M115 Printed in U S A

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