System Architecture

Figure 4-2 shows the Extensa system architecture. The remainder of this section provides a detailed description of the major chips used in the Extensa Notebooks.

SYSTEM ARCHITECTURE

Diagram Blok Acer 4732z

Figure 4-2 Extensa Series System Architecture Diagram

ALI M1521 (PCI, Cache, and Memory Controller)

The ALADDIN-III consists of two chips, ALI M1521 and M1523 to give a 586 class system the complete solution with the most up-to-date feature and architecture for the new multimedia/multithreading operating system. It utilizes the BGA package to improve the AC characterization, resolves system bottleneck and make the system manufacturing easier. The ALADDIN-III gives a highly-integrated system solution and a most up-to-date system architecture including the UMA, ECC, PBSRAM, SDRAM/BEDO, and multi-bus with highly efficient, deep FIFO between the buses, such as the HOST/PCI/ISA dedicated IDE bus.

The M1521 provides a complete integrated solution for the system controller and data path components in a Pentium-based system. It provides 64-bit CPU bus interface, 32-bit PCI bus interface, 64/72 DRAM data bus with ECC or parity, secondary cache interface including pipeline burst SRAM or asynchronous SRAM, PCI master to DRAM interface, four PCI master arbiters, and a UMA arbiter. The M1521 bus interfaces are designed to interface with 3V and 5V buses.

The signal descriptions for the M1521 are provided in Table 4-2. The chip pinouts are provided in Figure 4-3.

KEY

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

2$

A

GND

GND

NC

AD29

AD25

AD23

AD21

FRAMEJ

AD17

CBE2J

TRDYJ

AD12

AD10

STOPJ

AD8

GNT2J

SERRJ

AD3

ADO

MD46

MD14

MD62

MD11

MD27

NC

GND

B

MREQJ

GND

AD31

AD27

PHLDJ

PHLDAJ

AD19

AD18

REQOJ

AD15

AD13

DEVSELJ

GNT1J

AD7

PAR

AD5

AD2

GNT3J

MD47

MD63

MD13

MD29

MD60

MD43

GND

GND

C

HD62

HD63

GND

MGNTJ

AD30

AD26

CBE3J

LOCKJ

AD24

AD16

CBE1J

AD14

REQ1J

AD11

PCLKIN

CBEOJ

AD4

REQ3J

AD1

MD31

MD30

MD28

MD12

GND

MD59

PRIO

D

HD61

HD59

HD60

GND

AD28

VCC

AD22

AD20

GND

IRDYJ

VCC

GNTOJ

AD9

GND

REQ2J

VCC

AD6

MD15

GND

MD45

VCC

MD61

GND

MD58

MD57

MD10

E

HD52

HD55

HD57

HD58

MD9

MD42

MD56

MD44

F

HD48

HD54

HD53

VCC

VCC

MD26

RAS3J

MD41

G

HD51

HD47

HD50

HD56

MD25

MD24

RAS1J

MD40

H

HD49

HD45

HD43

GND

M1521

MD8

MPD3

MPD1

MPD5

J

HD39

LOCKJ

HD46

HD41

388 PIN

GND

RAS2J

CAS6J

MPD7

K

HD44

HD40

HD36

MIOJ

MPD6

RASOJ

CAS2J

MPDO

L

HD42

HD37

HD34

VCC

GND

GND

GND

GND

GND

GND

VCC

MPD4

MPD2

MD23

M

CACHEJ

HD38

KENJ

BE1J

GND

GND

GND

GND

GND

GND

CAS4J

MD55

MD54

CASOJ

N

BE2J

BEOJ

BE4J

GND

GND

GND

GND

GND

GND

GND

CAS1J

CAS5J

HCLKIN

MD39

P

BE5J

AHOLD

BRDYJ

BE6J

GND

GND

GND

GND

GND

GND

GND

MD7

MD38

CAS3J

R

HD35

BE3J

HD33

NAJ

GND

GND

GND

GND

GND

GND

MD22

CAS7J

RAS4J

RAS6J

T

BE7J

HD32

HD29

VDD_5

GND

GND

GND

GND

GND

GND

VDD_5

MD6

MD37

MD53

U

H030

HD31

HD28

HD27

RAS7J

MD21

MD52

RAS5J

V

HD25

BOFFJ

EADSJ

GND

MD4

MD5

MD48

MD20

w

HD23

HD26

HD7

HD19

GND

MD19

MD51

MD36

Y

HD21

HD24

HD22

HD2D

MD49

MD35

MD50

MD18

AA

HD17

ADSJ

HD14

VCC

VCC

MD1

MD2

MD3

AB

HD16

HD12

HD6

HDS

MD33

MD16

MD17

MD34

AC

HD15

HD18

HD4

GND

HD3

VCC

A18

GND

A10

AS

VCC

A24

GND

A6

MWEJ

VCC

MA3

GND

COEJ

TI01

VCC

BWEJ

GND

MD32

TIOO

MDO

AD

NC

HD5

GND

HD1

HD11

A19

A14

A9

A31

A27

WRJ

A22

A3

A4

MAAQ

MA5

MA9

MA10

CADSJ

CCSJ

TI03

TI07

TI09

GND

TI010

TI05

AE

GND

GND

SUSPENDJ

HD2

HD10

A17

A13

A16

A12

A7

HITMJ

A21

A28

SMIACTJ

A30

MAB1

MA6

MA2

MA11

RSTJ

TI04

GWEJ

32 K

TIQ8

GND

NC

AF

GND

NC

HDO

HD9

HD13

A20

A15

A11

OCJ

A8

A25

A23

A26

A29

MAA1

MABO

M A4

MA8

MA7

CADVJ

TWEJ

TI02

TI06

NC

GND

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

4.3.2.1 ALI M1523 (PCI-ISA Bridge)

The M1523 is a bridge between PCI and ISA bus, providing full PCI and ISA compatible functions. The M1523 has Integrated System Peripherals (ISP) on-chip and provides advanced features in the DMA controller. This chip contains the keyboard controller, real-time clock and IDE master controller. This chip also supports the Advanced Programmable Interrupt controller (APIC) interface. One eight-byte bidirectional line buffer is provided for ISA/DMA master memory read/writes. One 32-bit wide posted-write buffer is provided for PCI memory write cycles to the ISA bus. It also supports a PCI to ISA IRQ routing table and level-to-edge trigger transfer.

The chip has two extra IRQ lines and one programmable chip select for motherboard Plug-and-Play functions. The interrupt lines can be routed to any of the available ISA interrupts.

The on-chip IDE controller supports two IDE connectors for up to four IDE devices providing an interface for IDE hard disks and CD-ROMs. The ATA bus pins are dedicated to improve the performance of IDE master.

The M1523 supports the Super Green feature for Intel and Intel compatible CPUs. It implements programmable hardware events, software event and external switches (for suspend/turbo/ring-in). The M1523 provides CPU clock control (STPCLKJ). The STPCLKJ can be active (low) or inactive (high) in turn by throttling control.

A simplified block diagram of the M1523 chip is shown in Figure 4-4 and the associated pinouts are provided in Figure 4-5.

CPURST

RSTDRV

OSC14M

PCICLK

FRAMEJ

TRDYJ

IRDYJ

STOPJ

DEVSELJ

SERRJ

PHOLDJ

PHLDAJ

FERRJ

IRQ[15:14]

INTAJ/M1II

NTBJ/S0

INTCJ/S1

INTDJ/S2

IGNNEJ

INTR

A20MJ

USBCLK

USBP[11:10]

IDAKJ[0:1]

IDERDY

IDEIORJ

IDEIOWJ

IDESCS3J

IDESCS1J

IDEPCS3J

IDEPCS1J

DATA Buffer Control

Address Buffer

Acer Travelmate Batt Pinout

Timer UNIT

MISC. Logic

REAL Time Clock

PS2/AT Keyboard Controller

DMA Refresh UNIT

SBHEJ

IO16J

M16J

MEMRJ

MEMWJ

IOCHRDYJ

NOWSJ

IOCHKJ

SYSCLK

BALE

IORJ

IOWJ

SMEMRJ/LMEGJ

SMEMWJ/RTCAS

EXTSW

STPCLKJ

SPKR

SIRQI XDIR SPLED ROMCSJ

SIRQII

RTC32KI

RTC32KII

KBINH/IRQ1

KBCLK/KBCSJ

KBDATA

MSCLK

IRQ12/MDATA

DACKJ[7:5]

DACK2J/3J

REFSHJ

Figure 4-4 M1523 Chip Simplified Block Diagram

10 11 12

20 21 22

Vss Q

SBHEJ

M16J

LA2 3

IO16J

LA22

IRQ10

LA21

IRQ11

VDD/BAT

RTC32KII

RTC32KI

LA20

LA19

IRQ15

LA18

IRQ14

LA17

MEMRJ

DREQ0

MEMWJ

DACK5J

DREQ5

DACK6J

SD10

DREQ6

SD11

DACK7J

SD12

DREQ7

SD13

SD14

SD15

OSC14M

SIRQI

SIRQII

USBCLK

DACK0J

DACK1J

CPURST

SMIJ

STPCLKJ

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