Infineon TC1796 Installation and operating instructions

App
lication Note, V 1.0, Ma
y
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
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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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