ADSP-BF526 EZ-Board Evaluation System Manual
2-13
ADSP-BF526 EZ-Board Hardware Reference
Audio LPBK (Loopback) Switch (SW10)
The
SW10
switch places the EZ-Board in a loopback to test the board for
signal/circuit continuity and functionality.
SW10
positions 1 and 2 connect
the
MICIN
signal to the headphone’s left and right outputs for audio
loopback. Do not turn
SW10
positions 1 and 2
ON
at the same time. See
“Power-On-Self Test” on page 1-37
SW10
positions 3 and 4 connects the line in to line out loopback. By
default,
SW10
is set to
OFF
,
OFF
,
ON
,
ON
.
ETH Mode/Flash CS Switch (SW11)
The Ethernet mode flash CS switch (
SW11
) sets the bootstrapping option
for the LAN8700 RMII PHY chip (
U29
). The mode settings for the PHY
utilize internal chip pull-ups. Setting a position 1–3 of
SW11
ON
connects a
shows the default as well as the alternate
switch settings.
SW11
position 4 disconnects the
SPISEL1
pin from the SPI flash chip (
U6
).
Setting
SW11
position 4
OFF
is useful when using
SPISEL1
on the expansion
interface II. By default,
SW11
is set to
OFF
,
OFF
,
OFF
,
ON
.
Table 2-8. ETH Mode Flash CS Switch (SW11 Positions 1–3)
MODE[2:0] Setting
Mode Definitions
OFF, OFF, OFF
All capable, auto negotiation (default)
OFF
,
OFF
,
ON
Power down mode
OFF
,
ON
,
OFF
Repeater mode, auto negotiation
OFF
,
ON
,
ON
100Base-TX half duplex advertised, auto negotiation
ON
,
OFF
,
OFF
100Base-TX full duplex
ON
,
OFF
,
ON
100Base-TX half duplex
ON
,
ON
,
OFF
10Base-T full duplex
ON
,
ON
,
ON
10Base-T half duplex