STPCI2HEYC(2002) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

STPCI2HEYC
(Rev.:2002)

X86 Core PC Compatible System-on-Chip for Terminals

STMicroelectronics 

STRAP OPTION

3. STRAP OPTION

This chapter defines the STPC Atlas Strap

Options and their locations. Some strap options

are left programmable for future versions of

silicon. The strap options are sampled at a specific

point of the boot process. This is shown in detail in

Figure 4-3

Signal

MD1

Designation

Reserved2

Location

Not accessible

Actual

Settings

Pull Up

Set to ’0’ Set to ’1’

-

-

MD2

MD3

HCLK Speed

Index 5F,bit 6 User defined

Index 5F,bit 7 User defined

See Section 3.1.3.

MD[4]

PCI_CLKO Divisor

Index 4A,bit 1 Pull-up

See Section 3.1.1.

MD[5]

MCLK Synchro (see Section 3.1.1. ) Index 4A,bit 2 User defined Async

Sync

MD[6]

MD[7]

PCI_CLKO Programming

Index 4A,bit 6 User defined

Index 4A,bit 7 Pull-down

See Section 3.1.1.

MD[8]

MD[9]

MD10

MD11

ISA / PCMCIA / Local Bus

Reserved2

Reserved2

Index 4A,bit 3

Index 4A,bit 3

Index 4B,bit 2

Index 4B,bit 3

User defined

User defined

Pull down

Pull down

See Section 3.1.1.

-

-

-

-

MD14

MD15

MD16

CPU clock Multiplication

Reserved2

Reserved2

Index 4B,bit 6

Not accessible

Not accessible

Pull-up

Pull up

Pull up

See Section 3.1.2.

-

-

-

-

MD17

PCI_CLKO Divisor

Index 4A,bit 0 User defined See Section 3.1.1.

MD18

HCLK Pad Direction

Index 4C,bit 2 Pull-up

Input

Output

MD19

MCLK Pad Direction

Index 4C,bit 3 Pull-up

Hi-Z

Output

MD20

MD21

MD23

DCLK Pad Direction

Reserved2

Reserved2

Index 4C,bit 4

Index 5F,bit 0

Index 5F,bit 2

User defined

Pull up

Pull up

Input

-

-

Output

-

-

MD24

Index 5F,bit 3 User defined

MD25

HCLK PLL Speed

Index 5F,bit 4 User defined See Section 3.1.3.

MD26

MD27

MD28

MD29

MD30

MD31

MD32

MD33

MD34

MD35

Reserved2

Reserved2

Reserved2

Reserved2

Reserved2

Reserved2

Reserved2

Reserved2

Reserved2

Index 5F,bit 5 User defined

Not accessible Pull up

-

-

Not accessible Pull up

-

-

Not accessible Pull up

-

-

Not accessible Pull up

-

-

Not accessible Pull up

Not accessible Pull down

Not accessible Pull up

Not accessible Pull down

Not accessible Pull down

MD36

MD37

MD38

Local Bus Boot Device Size

Reserved2

Reserved2

Index 4B,bit 0 User defined 8-bit

Not accessible Pull down

-

Not accessible Pull down

-

16-bit

-

-

MD40

CPU clock Multiplication

Index 4B,bit 7 User defined See Section 3.1.2.

MD41

Reserved2

Not accessible Pull down

-

-

MD42

Reserved2

Not accessible Pull up

-

-

MD 43

Reserved2

Not accessible Pull down

-

-

Note1: Strap options on TC/PA[3] and DACK_ENC[2:0]/PA[2:0] are required for all the STPC Atlas Configurations (ISA,

PCMCIA, Local Bus).

Note2: Must be implemented.

Issue 1.0 - July 24, 2002

33/111

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