ARM ARM DUI 0224I manual Configuration switches

Models: ARM DUI 0224I

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Hardware Description

 

Configuration switches

 

The S1 boot option select switches are listed in Table 3-1. For more information on

 

setting boot memory options, see Setting the configuration switches on page 2-3 and

 

Configuration and initialization on page 4-9, and Boot Select Register, SYS_BOOTCS

 

on page 4-34. Switch S1 values determine the BOOTCSSEL[7:0] signals. (S1-1

 

controls BOOTCSSEL0 and S1-8 controls BOOTCSSEL7.)

 

 

 

 

 

Table 3-1 Configuration switch S1

 

 

Switch

Description

 

 

S1-1

Controls the chip select signals for the static memory, see also Setting the configuration switches

and

on page 2-3.

S1-2

The factory default setting is booting from NOR flash 2, S1-1 OFF and S1-2 OFF.

 

 

S1-3

Forces asynchronous AHB bridge mode.

 

The factory default is OFF, the mode for each bridge is selected by the value of bits [24:22] of the

 

SYS_CFGDATA2 register. The default for the register bits is LOW, synchronous mode used for

 

all bridges, see Configuration registers SYS_CFGDATAx on page 4-25.

 

 

S1-4

Reserved for selection of the controller to use for static memory.

 

The factory default is OFF.

 

 

Caution

 

 

 

 

 

 

This switch must not be changed from the default position as the functionality is not supported.

 

 

 

 

 

 

S1-5

Selects low-frequency startup mode. OSCCLK0 is programmed for 10MHz.

 

This startup mode is used, for example, when there is an external Logic Tile connected that cannot

 

support high frequency at startup.

 

The factory default is OFF.

 

See Selecting slow start on page 3-50.

 

 

S1-6

Selects one of four PB926EJ-S FPGA images to load on power up (or after the FPGA CONFIG

and

button is pressed).

S1-7

The factory default is FPGA image zero, S1-7 OFF and S1-6 OFF.

 

 

Note

 

 

 

 

 

 

Only one image is supplied with the PB926EJ-S. See FPGA configuration on page 3-18.

 

 

 

 

 

S1-8

Logic Tile stack image. Selects one of two Logic Tile FPGA images to load on power up.

 

The factory default is Logic Tile FPGA image zero, S1-8 OFF. See the documentation provided

 

with your Logic Tile for details on the FPGA_IMAGE signal.

 

 

 

 

 

 

3-8

Copyright © 2003-2010 ARM Limited. All rights reserved.

ARM DUI 0224I

Page 70
Image 70
ARM ARM DUI 0224I manual Configuration switches