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| 型號： | NS486SXLVUL |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Optimized 32-Bit 486-Class Controller with On-Chip Peripherals for Embedded Systems |
| 中文描述： | 優(yōu)化的32位486級控制器的片上外圍設(shè)備的嵌入式系統(tǒng) |
| 文件頁數(shù)： | 3/6頁 |
| 文件大小： | 466K |
| 代理商： | NS486SXLVUL |
1.0 System Overview
1.1 NS486SXL SYSTEM OVERVIEW
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
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.
backup;
and
support
for
***Indicates low-true signals
FIGURE 1. NS486SXL Internal Resource to Pins Map
3
www.national.com
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