Spectrum Digital eZdsp F2808, Technical Reference

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Spectrum Digital, Inc
2-19
2.5.1.1 Switch SW1, Positions 1-3, Boot Mode Select
Positions 1-3 on switch SW1 are used to determine what mode the DSP will use for
bootloading on power up. The options are shown in the table below.
* factory default
2.5.1.2 Switch SW1, Position 4, EEPROM Write Enable/Disable
Position 4 on switch SW1 is used to enable or disable the Write Enable for the
EEPROM. When position 4 is in the “Closed” state the Write Protect to the EEPROM is
disabled, therefore allowing the EEPROM to be written. When position 4 is in the
“Open” state the EEPROM Write Protect is enabled, not allowing the EEPROM to be
written. These positions are shown in the table below.
* factory default
Table 14: SW1, Positions 1-3
Position 1
GPIO18
Position 2
GPIO29
Position 3
GPIO34
Boot
Mode
Open-1 Open-1 Open-1 Flash
Open-1 Open-1 Closed-0 SCI-A
Open-1 Closed-0 Open-1 SPI-A
Open-1 Closed-0 Closed-0
I
2
C-A
Closed-0 Open-1 Open-1 eCAN-A
Closed-0 Open-1 Closed-0 M0 SARAM *
Closed-0 Closed-0 Open-1 OTP
Closed-0 Closed-0 Closed-0 I/O
Table 15: SW1, Position 4
Position Function
Closed-0 * EEPROM WP Disabled (EEPROM can be written to) *
Open-1 EEPROM WP Enabled (EEPROM cannot be written to)