STPC4EDBC datasheet(81/93 Pages) STMICROELECTRONICS

Nome de Peças	STPC4EDBC

Descrição Electrónicos	X86 Core PC Compatible Information Appliance System-on-Chip

PDF	93 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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81 / 93 page

DESIGN GUIDELINES

Release 1.5 - January 29, 2002

81/93

6.4.4. PCI INTERFACE

6.4.4.1. Introduction

In order to achieve a PCI interface which work at

clock

frequencies

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 6-23. Clock Scheme

HCLK PLL

1/2

1/3

1/4

clock

Strap Options

PCICLKO

PCICLKI

HCLK

AD[31:0]

South

North

Deskewer

MUX

delay

STPC

MD[30:27]

MD[17,4]

MD[7:6]

Bridge

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