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NS486SXLVUL PDF даташит

Спецификация NS486SXLVUL изготовлена ​​​​«National» и имеет функцию, называемую «Optimized 32-Bit 486-Class Controller with On-Chip Peripherals for Embedded Systems».

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Номер произв NS486SXLVUL
Описание Optimized 32-Bit 486-Class Controller with On-Chip Peripherals for Embedded Systems
Производители National
логотип National логотип 

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NS486SXLVUL Даташит, Описание, Даташиты
ADVANCE INFORMATION
December 1997
NS486SXL
Optimized 32-Bit 486-Class Controller with On-Chip
Peripherals for Embedded Systems
General Description
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.
Features
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
time clock
n Protected WATCHDOGtimer
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
interface
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
interfaces
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
where possible
Block Diagram NS486SXL Single-Chip Embedded Controller
MICROWIRE, NS486and WATCHDOGare trademarks of National Semiconductor Corporation.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
Intel486is a trademaek of Intel Corporation.
pSOS +is a trademark of Integrated Systems, Inc.
VRTXis a registered trademark of Microtec Research, Inc.
PowerPack® is a registered trademark of Microtek International.
QNXis a registered trademark of QNX Software Systems, Inc.
VxWorksis a registered trademark of Wind River Systems, Inc.
© 1998 National Semiconductor Corporation DS100121
DS100121-1
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NS486SXLVUL Даташит, Описание, Даташиты
Table of Contents
1.0 System Overview
1.1 NS486SXL System Overview
1.2 32-bit Processor Core
1.3 System Service Elements
1.3.1 DRAM Controller
1.3.2 Programmable Interval Timer
1.3.3 WATCHDOG Timer
1.3.4 Interrupt Controller
1.3.5 Real Time Clock/Calendar
1.3.6 Power Management Features
1.4 NS486SXL System Bus
1.5 Other On-board Peripherals
1.5.1 Reconfigurable I/O Lines
1.5.2 MICROWIRE/Access.bus Interface
1.5.3 UART Serial Port
1.6 ICE Support
1.7 Other Issues
2.0 SXL Pin Description Tables
3.0 Device Specifications
3.1 DC Electrical Specifications 5V ± 5%
3.1.1 Recommended Operating Conditions
3.1.2 Absolute Maximum Ratings (Notes 2 and 3)
3.1.3 Capacitance: TA = 25˚C, f = 1 MHz
3.1.4 DC Characteristics
3.2 General AC Specifications
3.2.1 Power Ramp Times
3.2.2 PWRGOOD and Power Rampdown Timing
3.3 AC Switching Specifications
3.3.1 DRAM Interface Timing Specification
3.3.2 ISA-like Bus Cycles Timing Specification
3.3.3 Ready Feedback Timing Specifications
3.3.4 OSCX1 AC Specification
4.0 NS486SXL Physical Description
List of Tables
Table 1. Bus Interface Unit Pins
Table 2. External Bus Master Interface Pins
Table 3. DRAM Control Pins
Table 4. Power Pins
Table 5. Reset Logic Pins
Table 6. General Purpose Chip Select Pins
Table 7. Auxiliary Processor Interface Pins
Table 8. Test Pins
Table 9. Interrupt Control Pins
Table 10. Real Time Clock Pins
Table 11. Oscillator Pins
Table 12. 16550 UART Pins
Table 13. Timer Pins
Table 14. 3-Wire Serial I/O Pins
List of Figures
FIGURE 1. NS486SXL Internal Resource to Pins Map
FIGURE 2.NS486SXL Internal Busses
FIGURE 3. NS486SXL Package Pinout Diagram
www.national.com
FIGURE 4. Switching Characteristic Measurement Wave-
forms
FIGURE 5. More Switching Specifications
FIGURE 6. Power Supply Rise and Fall
FIGURE 7. PWGOOD in relation to VDD
FIGURE 8. DRAM Timing Diagram
FIGURE 9. ISA-like Bus Timing Diagram
FIGURE 10. Ready Feedback Timing Diagram
FIGURE 11.TTL Clock Input Timing Diagram
FIGURE 12. PIC Timing Diagram
FIGURE 13. Access.bus Timing Diagram
FIGURE 14. UART Baud Rate and Infrared Clocks
FIGURE 16. UART MODEM Control Timing
FIGURE 17. NS486SXL Package
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NS486SXLVUL Даташит, Описание, Даташиты
1.0 System Overview
1.1 NS486SXL SYSTEM OVERVIEW
***Indicates low-true signals
FIGURE 1. NS486SXL Internal Resource to Pins Map
DS100121-2
The NS486SXL is a highly integrated embedded system
controller. It includes an Intel486-class 32-bit processor, all
resources required for the System Service Elements of a
Real-Time Executive, and a selection of key I/O peripherals.
This “system-on-a-chip” is ideal for implementing a wide va-
riety of embedded applications.
The 32-bit processor core executes all of the Intel486 in-
structions with a similar number of clocks per instruction. An
on-board 1 Kbyte instruction cache provides for efficient ex-
ecution from ROM. Intel486 debug features are supported.
The processor has been optimized for operating system ker-
nels such as VRTX, VxWorks, pSOS+ and QNX. These en-
vironments only need the ’486 protected mode operation (no
real mode or virtual 8086 support), flat or linear memory ad-
dressing (no virtual memory paging), and floating point ex-
ecution in software only (no co-processor interface).
In fact, the NS486SXL includes all of the System Service El-
ements required by a typical kernel, including an efficient
DRAM controller that supports pagemode DRAMs for data
cache-like performance; three timer channels (including one
configured as a protected WATCHDOG Timer); two pro-
grammable 8259 interrupt controllers provide 15 on-chip in-
terrupt sources; an industry standard real time clock and cal-
endar (RTC) with battery backup; and support for
comprehensive power management schemes.
In addition, the NS486SXL also incorporates the key I/O pe-
ripherals required for implementing a wide variety of embed-
ded applications: an industry standard high-performance
NS16550-compatible UART with HP-SIR and IrDA v1.0 in-
frared option, an 8254 timer, and a general purpose 2- or
3-wire synchronous serial interface for easy interface to low-
cost EEPROMs and other serial peripherals. System expan-
sion is supported with nine programmable Chip Select (CS)
signals and a generic ISA-type bus interface for external de-
vices and memory.
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Номер в каталогеОписаниеПроизводители
NS486SXLVULOptimized 32-Bit 486-Class Controller with On-Chip Peripherals for Embedded SystemsNational Semiconductor
National Semiconductor
NS486SXLVULOptimized 32-Bit 486-Class Controller with On-Chip Peripherals for Embedded SystemsNational
National

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