Infineon TC1796 Instrucciones de instalación y funcionamiento

App

lication Note, V 1.0, Ma

2004

TC1796 (B-step)

How to connect the EBU when it

is not used?

Microcontrollers

AP32008

Never stop thinking.

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TC1796 (B-step)

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Edition 2004-05

Published by

Infineon Technologies AG

81726 München, Germany

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AP32008

Connection of an unused EBU

Table of Contents

Application Note 3 V 1.0, 2004-05

Table of Contents Page

1Introduction ................................................................................................... 4

2Connection of the EBU.................................................................................. 5

AP32008

Connection of an unused EBU

Introduction

Application Note 4 V 1.0, 2004-05

1 Introduction

In some applications, the External Bus Unit (EBU) of the TC1796 is not used. It

happens for example when only the internal flash is used, and no external memory

and / or device is needed in addition to the TC1796. This application note provides

some recommendations on how to connect the EBU pins when its functionality is not

needed by the system. The recommendations below assume the EBU is not

connected to any external bus. Besides, it is also assumed that the user does not

intend to change the configuration of the EBU from its reset value.

AP32008

Connection of an unused EBU

Connection of the EBU

Application Note 5 V 1.0, 2004-05

2 Connection of the EBU

When the TC1796 is not connected to any external bus, the boot options shall be

selected such that the “Normal Internal Start “ boot mode is selected and the EBU is

configured after reset in “No bus” arbitration mode (EBU_CON.ARBMODE = 00B). See

User’s Manual for details on the TC1796 boot options.

When no bus is connected to the EBU, it is recommended, as shown in Figure 1, to

connect the EBU such that:

1. All its inputs are connected to GND (in order to avoid unpredictable behavior).

2. All its outputs and input /outputs are left open.

Figure 1 Recommended connection of the EBU

HOLD#

HDLA#

BREQ#

D(31:0)

A(23:0)

RD#

RD/WR#

MR/W#

BC(0..3)#

CS(0..3)#

VDDEBU(0..8)

CSComb#

WAIT#

ADV#

BAA#

BFCLKI

BFCLKO

GND

TC1796 EBU

AP32008

Connection of an unused EBU

Connection of the EBU

Application Note 6 V 1.0, 2004-05

Signal connections are detailed in Table 1:

Table 1 Recommended connections of the EBU.

Signal Description Type Connected to

VDDEBU(0..8) EBU power supply

Input.

Power supply GND

HOLD# Hold Request Input. Input GND

WAIT# Wait Input. Input GND

BFCLKI Burst Mode Flash

Clock Input.

Input GND

BREQ# Bus Request Output. Output Open

HDLA# Hold Acknowledge

Output.

Output Open

D(31:0) EBU Data Bus Lines Input/Output Open

A(23:0) EBU Address Bus

Lines

Input/Output Open

RD# Read Control Line Output Open

RD/WR# Write Control Line Output Open

MR/W# Read/Write Control

Line

Output Open

ADV# Address Valid

Output.

Output Open

BAA# Burst Address

Advance Output.

Output Open

BDCLKO Burst Mode Flash

Clock Output.

Output Open

BC(0..3)# Byte Control Lines Output Open

CS(0..3)# Chip Select Output

Lines

Output Open

CSCOMB# Combined Chip

Select Output

Output Open

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