Development Board Jumper And Switch Settings; Controlling / Changing Processor States; Table 4-1. Jumper Settings Used To Enable Certain Processor States - Cirrus Logic ARM CDB89712 User Manual

4.4 DEVELOPMENT BOARD JUMPER AND SWITCH SETTINGS

This section describes the jumpers switches, indicators and other signals that are available on the
CS89712 Development Board. For more information about the functions they control, see the
CS89712 Data Sheet.
4.4.1

Controlling / Changing Processor States

Table 4-1 shows the jumper settings for controlling and changing the operating states of CS89712
microcontroller.
NOTE: Each CS89712 Development Board is checked before it leaves the factory to make sure it powers up
correctly. All jumpers are set to allow you to power up the board.
Jumper
JP31 MEDCHG
JP35 UART2 EN/DIS
JP27/28 PE[1:0]
JP32 nURESET
JP29/30 nTEST[1:0]
J2
JP25 EE Data In
JP26
4-4
Signal
Boot in normal mode, start executing from flash, location
0x0000:0000. (Factory setting)
Boot from internal boot-ROM, reverse chip select mapping
& begin executing from what is normally expansion page
7, now at location 0x0000:0000.
Enable UART2 line driver. (Factory setting)
Disable UART2 line driver.
32-bit boot operation. (Factory setting)
8-bit boot operation.
16-bit boot operation.
Invalid.
nURESET pulled high. (Factory setting)
nURESET pulled low (S3 disabled).
Factory setting shown. Please consult the CS89712
User's Manual for further information on these control
lines.
Factory test only.
Enables Ethernet EEPROM.
Factory test only.

Table 4-1. Jumper settings Used to Enable Certain Processor States

Description
a
CDB89712
DS502UM2