STPC12GEYC datasheet(13/111 Pages) STMICROELECTRONICS

13 / 111 page

PIN DESCRIPTION

Issue 1.0 - July 24, 2002

13/111

2. PIN DESCRIPTION

2.1. INTRODUCTION

The

STPC

Atlas

integrates

most

the

functionalities of the PC architecture. Therefore,

many of the traditional interconnections between

the host PC microprocessor and the peripheral

devices are totally internal to the STPC Atlas. This

offers improved performance due to the tight

coupling of the processor core and it’s peripherals.

As a result many of the external pin connections

are made directly to the on-chip peripheral

functions.

Table 2-1 describes the physical implementation

listing signal types and their functionalities. Table

2-2 provides a full pin listing and description.

Table 2-6 provides a full listing of the STPC Atlas

package pin location physical connection. Please

refer to the pin allocation drawing for reference.

Due to the number of pins available for the

package, and the number of functional I/Os, some

pins have several functions, selectable by strap

option on Reset. Table 2-4 provides a summary of

these pins and their functions.

Non multi-functional pins associated

with

particular function are not available for use

elsewhere when that function is disabled. For

example, when in the ISA mode, the Local Bus is

disabled totally and Local Bus pins are set to the

tri-state (high-impedance) condition.

Table 2-1. Signal Description

Group name

Qty

Basic Clocks, Reset & Xtal (SYS)

SDRAM Controller (SDRAM)

PCI Controller

ISA Controller

100

Local Bus I/F

PCMCIA Controller

IDE Controller

VGA Controller (VGA) / I2C10

Video Input Port

TFT output

USB Controller

Serial Interface

Keyboard/Mouse Controller

Parallel Port

GPIO Signals

JTAG Signals

Miscellaneous

Grounds

VDD 3.3 V/2.5 V

Reserved

Total Pin Count

516

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