PC87782 Datasheet, PDF (1/17 Pages) National Semiconductor (TI) – CompactRISC Intelligent System Management Controller

PRELIMINARY
March 1998
PC87782 CompactRISC Intelligent System Management
Controller
General Description
The PC87782 CompactRISC™ 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.
System Diagram
Features
s CPU Features
— Fully static core, capable of operating at any rate
from 4 MHz to 20 MHz
— On-chip high-speed clock generator
— Multi-source vectored interrupts (internal, external,
and on-chip peripheral)
— On-chip power-on reset
s On-Chip Memory
— 32K mask-programmed ROM program memory
— 2,784 bytes of static RAM data memory
s On-Chip Peripherals
— Host Interface to PC (ISA and ACPI 1.0 compatible)
— 10/100 LAN Interface to monitor network traffic for
PC wake-up on LAN activity
— Fan-Speed Timer to monitor cooling fans
— System Management (ACCESS.bus) Interface, a 2-
wire serial interface compatible with Intel’s SMBus
and Phillips’ I²C bus
— 8-channel, 8-bit Analog-to-Digital (A/D) converter
— 8-bit Digital-to-Analog (D/A) converter
— Integrated WATCHDOG™ logic
CR16A
Core
Processing
Unit
MII Standard
Interface
Core Bus
Bus
Adaptor
ROM
RAM
Peripheral Bus
LAN
Interface
Registers
ICU
NAND
Test
Multi-Input
Wake-Up
EC and PM
Host I/F
A/D
D/A
Fan Speed WATCHDOG
Counter
Reset &
Configuration
SMB Bus Ifc
I/O Ports
Power
Management
HF & LF
Clock
Generator
PFAIL
System
Events
Host Port
Analog SMB Serial Fan Inputs
Channels Interface
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
CompactRISC™ and WATCHDOG™ are trademarks of National Semiconductor Corporation.
©1998 National Semiconductor Corporation
GPIO
32.768KHz
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