Optimized 32-Bit 486-Class Controller with On-Chip
Peripherals for Embedded Systems
The NS486SXL is a highly integrated embedded system
controller incorporating an Intel486™-class 32-bit processor
along with all of the necessary System Service Elements,
implementing a true “system on a chip.” It is ideally suited for
a wide variety of applications running in a segmented
protect-mode environment. The NS486SXL is the second
member of the NS486 family.
n 100% compatible with VxWorks™, VRTX™, QNX™
Neutrino, pSOS +®, and other popular real-time
executives and operating system kernels
n Intel486 instruction set compatible (protected mode only)
with optimized performance
n Operation at 25 MHz with 5V supply
n Low cost 132-pin PQFP package
n Industry standard interrupt controller, timers, and real
n Protected WATCHDOG™ timer
n Optimized DRAM Controller (supports two banks, up to
8 Mbytes each)
n Up to nine versatile, programmable chip selects
n Up to eight external interrupts directly supported, and
additional interrupt expansion through an external PIC
n Glueless interface to ISA-type peripherals
n Arbitration support for auxiliary processor
n Support for External Bus Masters, allowing them to
access DRAM and on-chip Peripherals
n MICROWIRE™/Access.bus synchronous serial
n UART with IrDA v1.0 (Infrared Data Association) port
n Reconfigurable I/O: Up to 28 I/O pins can be used as
general purpose bidirectional I/O lines
n Flexible, programmable, multilevel power saving modes
maximize power savings
n Programming model compatible with the NS486SXF
Block Diagram NS486SXL Single-Chip Embedded Controller
MICROWIRE™, NS486™ and WATCHDOG™ are trademarks of National Semiconductor Corporation.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
Intel486™ is a trademaek of Intel Corporation.
pSOS +™ is a trademark of Integrated Systems, Inc.
VRTX™ is a registered trademark of Microtec Research, Inc.
PowerPack® is a registered trademark of Microtek International.
QNX™ is a registered trademark of QNX Software Systems, Inc.
VxWorks™ is a registered trademark of Wind River Systems, Inc.
© 1998 National Semiconductor Corporation DS100121