Push Button and Switch Settings
2-14
ADSP-BF526 EZ-Board Evaluation System Manual
ETH Enable Switch (SW12)
The Ethernet enable switch (
SW12
) enables the Ethernet interface. The
Ethernet and NAND flash share the same lines and cannot operate at the
same time. By default, the
SW12
settings are
OFF
,
OFF
,
ON
,
OFF
(see
). Ethernet is enabled by setting the switch to
ON
,
ON
,
OFF
,
ON
.
SW12
positions 1and 2 connect the PHY management bus (
MDIO
and
MDC
).
SW12
position 3
ON
enables the 50 MHz RMII clock.
SW12
position 4 holds
the PHY in reset (set to
OFF
) or connects the PHY reset to the EZ-Board
reset (set to
ON
).
Rotary/NAND Enable Switch (SW13)
The rotary/NAND enable switch (
SW13
) disconnects the rotary encoder
signals from the GPIO pins of the processor. When
SW13
is
OFF
, its associ-
ated GPIO signals can be used on the expansion interface II (see
). Position 4 of
SW13
disconnects the chip enable for the
NAND flash memory (
U4
).
Table 2-9. ETH Enable Switch (SW12)
SW12 Switch Setting
Ethernet Mode
OFF, OFF, ON, OFF
OFF (default)
ON
,
ON
,
OFF
,
ON
ON
Table 2-10. Rotary NAND Enable Switch (SW13)
SW13 Position (Default)
From
To
1 (
ON
)
Encoder (
SW5
)
Processor (
U1
,
PF13
)
2 (
ON
)
Encoder (
SW5
)
Processor (
U1
,
PF12
)
3 (
ON
)
Encoder (
SW5
)
Processor (
U1
,
PF11
)
4 (
ON
)
Processor (
U1
,
PH10
)
NAND (
U15
)
