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PC87782 Datasheet

  • PC87782

  • 117.81KB

  • 17頁

  • ETC

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PC87782 CompactRISC Intelligent System Management Controller
PRELIMINARY
March 1998
PC87782 CompactRISC Intelligent System Management
Controller
General Description
The PC87782 CompactRISC鈩?16-bit Embedded Control-
ler is a highly integrated microcontroller designed for power
management applications in desktop Personal Computers
(PCs). The device is optimized for ACPI Power Manage-
ment, including multi-pattern Wake-up on LAN scanning;
and System Environment monitoring, including fan speed,
supply voltages, temperature and chassis intrusion. The
PC87782 incorporates National's CR16A CPU core (a
high-performance 16-bit RISC core), on-chip memories,
and system support functions.
The CR16A core offers the high performance of a RISC ar-
chitecture while retaining the advantages of a traditional
Complex Instruction Set Computer (CISC): compact code,
on-chip memory and I/O, and low cost. The CPU uses a
three-stage instruction pipeline that allows execution of up
to one instruction per clock cycle, or up to 20 million in-
structions per second (MIPS) at the maximum clock rate of
20 MHz.
Patent Pending.
Features
s
CPU Features
鈥?Fully static core, capable of operating at any rate
from 4 MHz to 20 MHz
鈥?On-chip high-speed clock generator
鈥?Multi-source vectored interrupts (internal, external,
and on-chip peripheral)
鈥?On-chip power-on reset
s
On-Chip Memory
鈥?32K mask-programmed ROM program memory
鈥?2,784 bytes of static RAM data memory
s
On-Chip Peripherals
鈥?Host Interface to PC (ISA and ACPI 1.0 compatible)
鈥?10/100 LAN Interface to monitor network traf鏗乧 for
PC wake-up on LAN activity
鈥?Fan-Speed Timer to monitor cooling fans
鈥?System Management (ACCESS.bus) Interface, a 2-
wire serial interface compatible with Intel鈥檚 SMBus
and Phillips鈥?I
2
C bus
鈥?8-channel, 8-bit Analog-to-Digital (A/D) converter
鈥?8-bit Digital-to-Analog (D/A) converter
鈥?Integrated WATCHDOG鈩?logic
System Diagram
CR16A
Core
Processing
Unit
MII Standard
Interface
Core Bus
Rcv Bufs
(4)
Xmit Buf
Bus
Adaptor
ROM
RAM
LAN
Interface
Registers
Peripheral Bus
ICU
NAND
Test
Multi-Input
Wake-Up
EC and PM
Host I/F
A/D
D/A
Fan Speed
Counter
SMB Bus Ifc
WATCHDOG
Reset &
Con鏗乬uration
I/O Ports
Power
Management
HF & LF
Clock
Generator
PFAIL
System
Events
Analog
Host Port Channels SMB Serial Fan Inputs
Interface
GPIO
32.768KHz
TRI-STATE廬 is a registered trademark of National Semiconductor Corporation.
CompactRISC鈩?and WATCHDOG鈩?are trademarks of National Semiconductor Corporation.
漏1998 National Semiconductor Corporation
www.national.com

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