Preliminary - Information Subject to Change - 9/24/98
EZ-USB Development Board
5 - 7
DIP Switch
Settings
General Note:One side of each S6 switch is connected to ground,
and the other side is connected to 3.3V through a pullup
resistor. Therefore an “ON” switch produces 0V or logic
LO, and an “OFF” switch produces 3.3V or logic HI.
Note 1:
Refer to “Memory Maps” on page 5-11for the four
memory map choices selected by these switches.
Note 2:
To use the U9 EEPROM as an AN2131 boot loader, set
switches 7 and 8 as shown in Table 5-5. The 24LC00
supplied on the board has no slave address pins, so the
switch settings are “don’t care”. The boot load
mechanism is described in the EZ-USB Technical
Reference Manual.
Table 5-4: 8-position DIP switch
S6
Position
Function
Description
Default
1
PCF8574 bit 4
8051 reads switch state over I
2
C bus
OFF(H)
2
PCF8574 bit 5
8051 reads switch state over I
2
C bus
OFF(H)
3
MM0
Memory Mode Select (Note 1)
OFF(H)
4
MM1
Memory Mode Select (Note 1)
OFF(H)
5
NC
OFF(H)
6
NC
OFF(H)
7
SA0
EEPROM Slave Address A0 (Note 2)
OFF(H)
8
SA1
EEPROM Slave Address A1 (Note 2)
OFF(H)
