STPC12GDYI datasheet(98/111 Pages) STMICROELECTRONICS

Part #	STPC12GDYI

Description	X86 Core PC Compatible System-on-Chip for Terminals

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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DESIGN GUIDELINES

98/111

Issue 1.0 - July 24, 2002

6.4.4. PCI INTERFACE

6.4.4.1. Introduction

In order to achieve a PCI interface which work at

clock

frequencies

up

to

33MHz,

careful

consideration has to be given to the timing of the

interface with all the various electrical and

physical constraints taken into consideration.

6.4.4.2. PCI Clocking Scheme

The PCI Clocking Scheme deserves a special

mention here. Basically the PCI clock (PCICLKO)

is generated on-chip from HCLK through a

programmable delay line and a clock divider. The

nominal frequency is 33MHz. This clock must be

looped to PCICLKI and goes to the internal South

Bridge through a deskewer. On the contrary, the

internal North Bridge is clocked by HCLK, putting

some additionnal constraints on T0 and T1.

Figure 6-28. Clock Scheme

HCLK PLL

1/2

1/3

1/4

clock

Strap Options

PCICLKO

T1

PCICLKI

HCLK

AD[31:0]

South

North

Deskewer

MUX

T0

T2

delay

STPC

MD[30:27]

MD[17,4]

MD[7:6]

Bridge

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