Notebook Functional Description

Battery Reconditioning 4 You

Battery Repair Ebook

Get Instant Access

Functionally, the notebook computer consists of the following major subsystems:

  • Processor and Memory Subsystem
  • I/O Subsystem
  • Video Subsystem
  • Hard Disk Subsystem
  • Floppy Disk Subsystem
  • CD-ROM Subsystem
  • PCMCIA Subsystem
  • Sound Subsystem
  • Serial Infrared Subsystem
  • Power Subsystem

A functional block diagram of the Extensa 57x Series Notebook is shown in Figure 4-1.

4.2.1 Processor/Memory Subsystems

The Processor function, housed on the Main Board, is implemented with the Intel™ Pentium Processor (P54C/LM). The processor operates in conjunction with RAM and ROM Memory on the Memory Board and other control logic on the Main Board to process software instructions (BIOS, Windows 95, and Applications).

Primary control for the Processor/Memory subsystem is implemented with the Pentium Chipset (Opti Viper 82C556/82C557).

The memory subsystem, implemented on the Memory Board and optional Dual Inline Memory Modules, provides 8 MB (expandable to 40 MB) of fast

DRAM memory, 128 bytes of CMOS RAM (battery backed up) and 256 KB of Flash ROM for system and video BIOS storage.

The basic 8 MB memory system can be expanded to a maximum of 40 MB by the addition of two DIMM memory modules (refer to Section 6 for installation details).

Tables 4-1 through 4-3 contain the Notebook I/O address map, DMA channel assignments and IRQ interrupt level assignments respectively.

PCMCIA Option Slot(s)

PCMCIA Option Slot(s)

Eisa Bus Block Diagram

INTERNAL KEYBOARD

INTERNAL LCD DISPLAY 640 X 480 SVGA LCD

Figure 4-1 Notebook Functional Block Diagram

INTERNAL KEYBOARD

INTERNAL LCD DISPLAY 640 X 480 SVGA LCD

Figure 4-1 Notebook Functional Block Diagram

Table 4-1 Extensa Series I/O Address Map

Address Range

Device

000-00F

DMA Controller 1

020-021

Interrupt Controller 1

022-023

M1429 Registers

040-043

Timer 1

060-06E

Keyboard Controller 8742 Chip Select

070-071

Real Time Clock and NMI Mask

080-08F

DMA Page Register

0A0-0A1

Interrupt Controller 2

0C0-0DF

DMA Controller 2

1F0-1F7

Hard Disk Select

178, 17A

6377 Registers

1F0-1F7

Hard Disk Select

3F6, 3F7

278-27F

Parallel Port 3

35F, 36F

Special I/O Ports

378, 37A

Parallel Port 2

3BC-3BE

Parallel Port 1

3C0-3C5

3C6-3C9

Video DAC

3C0-3CF

Enhanced Graphics Display

3D0-3DF

Color Graphics Adapter

3E0-3E1

PCMCIA Controller

3F0-3F7

Floppy Disk Controller

3F8-3FF

Serial Port 1

Table 4-2 DMA Channels

Controller

Channel

Address

Function

1

0

0087

Spare

1

1

0083

Spare

1

2

0081

Diskette

1

3

0082

Spare

2

4

Cascade

Cascade

2

5

008B

Spare

2

6

0089

Spare

2

7

008A

Spare

Table 4-3 IRQ Interrupt Levels

Priority

Interrupt Number

Interrupt Source

1

SMI

Power management unit

2

NMI

Parity Error Detected, I/O Channel Error

3

IRQ0

Interval Timer, Counter 0 Output

4

IRQ1

Keyboard

IRQ 2

Interrupt from controller 2 (cascade)

5

IRQ8

Real Time Clock

6

IRQ 9

Cascaded to INT 0AH (IRQ 2)

7

IRQ10

Reserved

8

IRQ 11

Reserved

9

IRQ 12

PS/2 Mouse

10

IRQ13

INT from Coprocessor

11

IRQ14

Hard Disk Controller

12

IRQ15

Reserved

13

IRQ3

Serial Comm Port 2

14

IRQ4

Serial Comm Port 1

15

IRQ5

Reserved

16

IRQ6

Diskette Controller

Priority

Interrupt Number

Interrupt Source

17

IRQ7

Parallel Port

Note: A PCMCIA card can use IRQ 3, 4, 5, 7, 9 and 11 as long as it does not conflict with the interrupt address of any other device.

4.2.2 I/O Subsystem

The I/O subsystem, implemented with an SMC37C655IR Super I/O Controller Chip, provides for such functions as internal floppy drive control, serial and parallel ports and support for the Serial Infrared port. The Super I/O Controller includes the following features:

  • 100 percent compatible with ISA, EISA, and micro-channel architectures
  • Built-in floppy disk controller
  • Two UARTs
  • Software compatible with the PC16550A and PC 16450
  • MIDI compatible
  • Infrared support on UART2 (IRDA-compliant)
  • Bidirectional Parallel Port
  • Enhanced Parallel Port (EPP) compatible
  • Extended Capabilities Port (ECP) compatible, including level 2 support
  • Bidirectional under either software or hardware control
  • Compatbile with ISA, EISA, and Micro Channel architectures
  • Ability to multiplex FDC signals on parallel port pins for external FDD
  • Includes protection circuit against damage caused when printer is powered up, or operated at higher voltages
  • Integral address decoder- provides selection of all primary and secondary ISA addresses including COM1-4 and LPT1-3.
  • Enhanced Power Management Function
  • Enhanced programmable power-down and wake-up modes
  • Auto power-down and wake-up modes
  • Typical current consumption during power-down is less than 10A

4.2.3 Video Subsystem

The video subsystem, implemented on the Main Board and on the LCD Display Unit, displays text, graphics and drives an external SVGA port. The video subsystem is implemented with a Cirrus™ Logic CL-GD 7543 high performance VGA controller and supporting logic and video RAM (1 MB).

The major features of the VGA controller include:

  • Highly integrated design (flat panel / CRT VGA controller, RAMDAC, clock synthesizer)
  • Multiple Bus Architecture Integrated Interface
  • Local Bus (32-bit CPU Direct and VL)
  • EISA/ISA (PC/AT™) 16-bit Bus
  • Integrated programmable linear address feature accelerates GUI performance
  • Supports panel resolutions up to 1280 X 1024 resolution including 800 X 600 and 1024 X 768
  • SMARTMAP intelligent color to gray scale conversion enhances text legibility
  • Text enhancement feature improves white text contrast on flat panel displays
  • Fully Compatible with IBM SVGA

4.2.3.1 External SVGA Drive Capability

The Extensa 57Xcontains an external SVGA port (15-pin, female, D-type connector) which can be used to drive an external CRT (standard SVGA modes with resolutions of 800 X 600 X 256, or 640 X 480 X 256).

4.2.4 Hard Disk Subsystem

The Hard Disk Subsystem, controlled by the IDE interface compatible 82C558N IPC chip, provides disk storage for all system software and user files. Initially, the 57X Series Notebooks are equipped with a removable 810 or 1200 Million Byte hard drive.

During the manufacturing process, Texas Instruments formats the hard disk and then loads all supplied software including Windows 95.

Caution: Formatting the disk drive erases any data that may be stored on the disk. Therefore do not attempt a format of the hard disk unless the computer self test and diagnostics confirm that the disk has not been formatted.

A Hard Drive activity ICON is located on the Status LED beneath the Display Assembly. This ICON is visible during hard driver read/write accesses.

Caution: The notebook should not be moved when the HDD ICON is lit to prevent accidental damage to the hard drive.

4.2.5 Floppy Diskette Drive Subsystem

The Floppy Diskette Drive Subsystem consists of a Floppy Controller (part of the Super I/O Chip, SMC37C655IR) and the removable Floppy Diskette Drive. The Floppy Diskette Drive can read/write standard 3.5-inch minidiskettes. The floppy drive installs in the Media Bay and can be removed to install a CD-ROM drive or a second battery pack (Lithium Ion).

4.2.6 CD-ROM Subsystem

Many of the Extensa 57x models are equipped with a removable 5.25 inch, CD-ROM drive (4X or 6X speeds). The drive uses the standard ATAPI interface.

The CD-ROM subsystem is controlled by the IPC (which also controls the hard drive subsystem).

4.2.7 PCMCIA Subsystem

The notebook is equipped with an on-board PCMCIA host adapter (UM8366F) PCMCIA Controller) and sockets to support Type I, II, or III options. The PCMCIA Controller has the following features:

Single-chip PCMCIA host adapters Direct connection to ISA (PC AT) Bus Direct connection to PCMCIA 2.0 Bus PCMCIA 2.0- and JEIDA 4.1-compliant 82365SL-compatible register set, ExCA-compatible Automatic Low-power Dynamic Mode for lowest power consumption Programmable Suspend Mode Five programmable memory windows per socket

  • Two I/O windows per socket
  • Programmable card access cycle timing
  • 8- or 16-bit CPU interface
  • 8- or 16-bit PCMCIA interface support
  • ATA disk interface support
  • Automatic flash memory timing support
  • Easy host interface using ISA I/O addresses 03E0h, 03E1h
  • Mixed-voltage (3.3V or 5V) operation
  • Dual-socket-interface, 208-pin QFP

4.2.8 Sound Subsystem (Model Dependent)

Some models of the Extensa 57x Series notebooks are equipped with a 16-bit stereo sound system including:

  • Built-in microphone and stereo speakers
  • Stereo line input (5-pin jack, DIP)
  • Stereo Line Output (5-pin jack, DIP)
  • External microphone input (5-pin jack, DIP)
  • Audio chipset

The sound subsystem is physically implemented on the IR/Sound Board.

4.2.9 Power Subsystem

The Power Subsystem consists of the following major parts:

  • Power Management (hardware and software components)
  • AC Adapter
  • Power Supply Board
  • Nickel Metal Hydride (NiMH) Battery Pack
  • Optional Secondary Battery Pack (Lithium Ion) if not using the Media Bay for a floppy drive or CD-ROM Drive

4.2.9.1 Power Management

The notebook is equipped with a power management function that minimizes battery usage for prolonged battery operation and automatically recharges the batteries when the notebook is used with an AC adapter.

The power management modes and warnings include the following:

  • LCD standby mode
  • Hard disk/CD-ROM standby mode
  • System standby/suspend mode
  • Battery-low warning
  • Standby/suspend upon battery low

4.2.9.2 AC Adapter

The notebook uses an AC adapter with built in over voltage and short circuit protection.

The adapter can with stand a continuous short-circuit to DC output without damage to the notebook logic components and resets to the normal power mode after the fault condition is removed.

4.2.9.3 Primary Battery Pack

The Extensa 57x Series Notebooks use a Nickel Metal Hydride battery as the primary battery pack. Specifications for the primary battery pack are provided in Table 4-4.

Table 4-4 Primary Battery Pack Specifications

Function

Specifications

Battery type

NiMH (Nickel Metal-Hydride)

Cell Type

A

Nominal voltage

8.4 V

Cell energy capacity

4200 mAH

Nominal rated capacity

27 Watt-hours

Charge and discharge cycles

500 (minimum)

4.2.9.4 DC-DC Converter/Battery Charger Circuit

The power supply board includes two DC-DC Converter circuits and a battery charging circuit that operate the notebook and charge the internal batteries when the AC Adapter is attached to the notebook. The converters operate from an input voltage between 7 VDC and 20 VDC (from the AC adapter) and generate the regulated voltages required to power all internal logic circuits and charge the internal batteries. When the AC adapter is not used, the DC-DC converters are powered by the output of the internal battery pack (s) (nominal 8.4V).

Was this article helpful?

0 0
DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

Get My Free Ebook


Post a comment